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ChangeLog

  • next version - XXXX-XX-XX

    • Add python libraries sklearn and nltk to plbase, and preload them in python trampoline (Binglin Chen).

    • Add UUIDs to cron job logs for better debugging (Matt West).

    • Add report of unsuccessful cron jobs (Matt West).

    • Add dev docs for interfacing async/await code (Matt West).

    • Add integration tests for daily cron jobs (Matt West).

    • Add example docker grading images for externally graded questions (James Balamuta).

    • Add ANSI color support to pl-external-grader-results element (Nathan Walters).

    • Add min-lines, max-lines, and auto-resize to change the number of lines displayed in the pl-file-editor (James Balamuta).

    • Add example question for the pl-file-editor element to element example gallery (James Balamuta).

    • Add docs for singleVariant question option (Matt West).

    • Add file attachments to student assessments and questions (Matt West).

    • Add connecting IP address report in instructor effective user page (Dave Mussulman).

    • Add SSL https support inside the Docker container (Dave Mussulman).

    • Add pl-hide-in-panel element (Matt West).

    • Add pl-drawing element (Mariana Silva and Nicolas Nytko)

    • Add pl-python-variable element for displaying Pandas dataframes and Python variables (Nicolas Nytko).

    • Add student Gradebook page (Matt West).

    • Add CloudWatch statistics for external grader lifecycles (Matt West).

    • Add python library tzlocal (James Balamuta).

    • Add console stack traces on Node warnings (Matt West).

    • Add support for Latex in <markdown> tags (Nathan Walters).

    • Add support for rendering graphs using adjacency matrices in pl-graph (Nicolas Nytko).

    • Add FAQ entries for escaping math mode in questions and accessing the data object on an external grader (James Balamuta).

    • Add a new example question showing a probability mass function with pl-python-variable (James Balamuta).

    • Add gvsu.edu as an institution option (Matt West).

    • Add scikit-learn, scikit-image, and other data science libraries to external Python grader (Nicolas Nytko).

    • Add 'paths-lookup' database tool (Dave Mussulman).

    • Add more detailed grader statistics (Matt West).

    • Add diagnostics for external grader results processing (Dave Mussulman).

    • Add the ucidata package to centos-plbase (James Balamuta, h/t David Dalpiaz).

    • Add navbar dropdowns to swap between courses, course instances, and assessments (Tim Bretl).

    • Add ability to create and modify all course content in the browser without docker or git (Tim Bretl).

    • Add support for Rust to pl-code element (Nathan Walters).

    • Add tests for LTI auth (Dave Mussulman).

    • Add more robust Python autograder to prairielearn/grader-python (Nathan Bowman and Nicolas Nytko).

    • Add choose course instance dropdown to instructor nav-bar when viewing course only (Tim Bretl).

    • Add file size limit to student-visible part of pl-file-upload (Nathan Bowman).

    • Add explanation of None role in documentation and instructor gradebook view (James Balamuta).

    • Add support for editing from bare git repo (Tim Bretl).

    • Add instructor panel to course question pages (Tim Yang).

    • Add disregard-extra-elements attribute to pl-drawing element to ignore duplicate grading objects (Nicolas Nytko).

    • Add extra /course* mount points (Tim Yang).

    • Add R vector/matrix support in pl-variable-output (James Balamuta).

    • Add example course question templates (James Balamuta).

    • Add support for pages to set their own titles in browser tabs via res.locals.pageTitle (David Mitchell)

    • Add extra /course* mount points (Tim Yang).

    • Add confirmation dialog for unsaved changes on question pages (Tim Yang).

    • Add Python library regex to plbase (Nathan Bowman).

    • Add all-of-the-above and none-of-the-above attributes to <pl-multiple-choice> (Bojin Yao)

    • Add external-json attribute to <pl-multiple-choice> (Bojin Yao)

    • Change v3 questions to disable autocomplete on the question form (Nathan Walters).

    • Change centos7-python to grader-python and place it under graders/ (James Balamuta).

    • Change blocked-event-loop detection to be more lightweight in production (Matt West).

    • Change file editing access to Editor, down from Owner (Matt West).

    • Change syncing to be more resilient and to record errors/warnings encountered during sync (Nathan Walters).

    • Change element default setup to be top-down instead of inline (James Balamuta).

    • Change type: "Exam" under mode: "Public" to not display "waiting for proctor..." message (James Balamuta).

    • Change Travis script to rebuild prairielearn/centos7-plbase if any relevant files have changed (Nathan Walters).

    • Change location of draft files for file editor from S3 (prod) / local (dev) to file-store (Tim Bretl).

    • Change docker to use CentOS7 python3 instead of python36u (Dave Mussulman).

    • Change SSL file paths to be configurable (Dave Mussulman).

    • Change rpy2 version from 2.9.5 to 3.2.0 (James Balamuta).

    • Change institution definitions to read from the institutions table (Dave Mussulman).

    • Change documentation examples to be self-contained (James Balamuta).

    • Change external grader documentation to show file system structure (James Balamuta).

    • Change test infrastructure to use testCourse instead of exampleCourse (James Balamuta).

    • Change size limit for form data by increasing from 200K to 1M (Nathan Bowman).

    • Change grader-r docker container to include pltest package (James Balamuta).

    • Change navbar/navtab structure to match course content structure (Tim Bretl).

    • Change MathJax version from 2.7.5 to 3.0.0 (Nicolas Nytko)

    • Change and standardize naming scheme on in-browser add/copy of course instance, assessment, or question (Tim Bretl).

    • Change order in which course instances are listed to be by earliest and latest access date (Tim Bretl).

    • Change size limit for form data to account for increase from encoding (Nathan Bowman).

    • Change styling for invalid input and pl-string-input for increased clarity. (Nicolas Nytko)

    • Fix dead letter cron job for async v3 (Matt West).

    • Fix deadlock when syncing course staff (Nathan Walters).

    • Fix name of migrations/145_file_edits__job_sequence_id__add.sql (Matt West).

    • Fix <pl-string-input> handling of HTML entities in input (Nathan Walters).

    • Fix assessment password clearing cookie situations, issue #1579 (Dave Mussulman).

    • Fix the syncing of missing tags and topics (Nathan Walters).

    • Fix documentation formatting (Dave Mussulman).

    • Fix handling of duplicate topics in infoCourse.json (Nathan Walters).

    • Fix tags/topics duplicates checking when tag/topic is a builtin JS object property, like toString (Nathan Walters).

    • Fix Makefile for documentation to build correctly (James Balamuta).

    • Fix description of the points download description for assessments (James Balamuta, h/t Mariana Silva).

    • Fix LTI callback URL (Matt West).

    • Fix vulnerability in external grading that allows arbitrary files on the server to be overwritten (Nathan Walters).

    • Fix bug in unicode encode/decode in file editor (Tim Bretl).

    • Fix KeyboardInterrupt errors when Ctrl-C'ing out of docker (Dave Mussulman).

    • Fix disabled server load reporting to CloudWatch (Matt West).

    • Fix legacy Ace editor assets (Nathan Walters).

    • Fix stack trace error printing for externally graded question errors (Dave Mussulman).

    • Fix SSL generation to happen at docker build instead of on each run (Dave Mussulman).

    • Fix external grading results containing NULL bytes (Matt West).

    • Fix MaxListenersExceededWarning (Dave Mussulman).

    • Fix jobsPerInstance grader statistic (Matt West).

    • Fix null filenames from missing files in downloads (Matt West).

    • Fix assessments.assessment_set_id to cascade on deletes (Matt West).

    • Fix git merge during CI (Matt West).

    • Fix to prevent instructor testing of externally-graded questions (Matt West).

    • Fix LTI outcome reporting with Blackboard Learn (Dave Mussulman).

    • Fix error reporting for v2 questions (Matt West).

    • Fix detection of different internals during R package installation (James Balamuta).

    • Fix figures in pl-drawing documentation (Nicolas Nytko).

    • Fix use of data["correct_answers"] in documentation (James Balamuta, h/t Eric Huber).

    • Fix authorization for users behind web proxies (Dave Mussulman).

    • Fix admin overview page institutions (Matt West & Dave Mussulman).

    • Fix button appearance after bootstrap upgrade (Tim Bretl).

    • Fix bug in course instance switcher on file edit page (Tim Bretl).

    • Fix bug in branch links on file browser page (Tim Bretl).

    • Fix bug in element popovers (Tim Bretl).

    • Fix redirects to question preview page by maintaining query parameters (Nathan Walters).

    • Fix redirects to course admin sub-page when switching course instances (Tim Bretl).

    • Fix server-side check of new file names and paths on in-browser rename (Tim Bretl).

    • Fix in-browser course edit handler to update commit hash only when using git (Tim Bretl).

    • Fix in-browser course edit handler to keep one course lock throughout entire process (Tim Bretl).

    • Fix button alignment in popovers (Tim Bretl).

    • Fix authorization of effective user (Tim Bretl).

    • Fix in-browser add/copy of course instances to ensure user has Instructor role (Tim Bretl).

    • Fix permissions on issues page (Tim Bretl).

    • Fix angle tolerance checks for vectors in pl-drawing element (Nicolas Nytko).

    • Fix unique element checking in default grader for pl-drawing element (Nicolas Nytko).

    • Fix math rendering in pl-drawing element on Safari (Nicolas Nytko).

    • Fix server jobs so that errors are handled only once (Tim Bretl).

    • Fix course instance access check (Tim Bretl).

    • Fix pl-string-input incorrectly displaying whitespace and special characters (Nicolas Nytko).

    • Fix gradebook and question statistics download links (Tim Bretl).

    • Fix demoRandomPlot by updating the matlibplot subplot code (James Balamuta).

    • Fix default institution in course instance access rules (Tim Bretl).

    • Fix group_work flag when calling authz_assessment_instance (Tim Bretl).

    • Remove number column from course_instances table and number property from infoCourseInstance.json schema (Tim Bretl).

    • Remove introduction alert at the top of homework assessments (Tim Yang).

  • 3.2.0 - 2019-08-05

    • Add openpyxl to the centos7-python for Excel .xlsx autograding (Craig Zilles).

    • Add feedback for correct answers in submitted answer panel (Brian Mercer).

    • Add Learning Tools Interoperability LTI 1.1.1 tool provider functionality (Dave Mussulman).

    • Add course instance admin subpages (Dave Mussulman).

    • Add networkx Python library to plbase (Nathan Bowman).

    • Add option to toggle placeholder help text for pl-number-input (James Balamuta and Nicolas Nytko).

    • Add size attribute to pl-number-input (Nicolas Nytko).

    • Add demo question showcasing all options for pl-number-input (James Balamuta and Nicolas Nytko).

    • Add read-only API for instructors to access assessment data (Nathan Walters).

    • Add networkx Python library to centos7-python (Nathan Bowman).

    • Add ability to "Grade all saved answers" on exam assessment overview (Dave Mussulman).

    • Add dead letter reporting to Slack (Matt West).

    • Add more logging for external grading jobs in production (Matt West).

    • Add documentation on common development errors to FAQ (James Balamuta).

    • Add R Data Packages and SQLite connection to centos-plbase (James Balamuta).

    • Add R package caching and parallel installation to centos-plbase (James Balamuta).

    • Add example script to download all course instance data from API (Matt West).

    • Add default tags for semester Sp19 - Fa21 (James Balamuta).

    • Add pl-graphviz-render element (Nathan Walters).

    • Add Graphviz Yum package and Python library to centos7-plbase and centos7-python (Nicolas Nytko).

    • Add a second example of reading XML code in from a file with pl-code (James Balamuta).

    • Add instructor info panel to student pages (Dave Mussulman).

    • Add ability to highlight the background of specific lines of text in pl-code (Nathan Walters).

    • Add R Data Packages and SQLite connection to centos-plbase. (James Balamuta).

    • Add test cases for the InstructorAssessmentDownloads page (Yuchen Pang).

    • Add verbose flag to tools/generate_uuid.py to show all the files changed by script (Pavitra Shadvani).

    • Add better logging of requests that don't have corresponding responses (Matt West).

    • Add student file storage for scratch paper scans (Matt West).

    • Add Mathematica language option to string_from_numpy() (Liz Livingston).

    • Add Mathematica tab and optional display attribute to pl-variable-output (Liz Livingston).

    • Add comment and child digit control for pl-variable-output, optional comment and digits (Liz Livingston).

    • Add vector support to numpy_to_matlab() and numpy_to_matlab_sf() (Liz Livingston).

    • Add force-download attribute to pl-file-download to specify whether to download or view in browser (Shreyas Patil).

    • Add images of elements to element documentation (James Balamuta).

    • Add check that no issues are generated by question load in testQuestions.js (Tim Bretl).

    • Add support for Markdown in questions with the <markdown> tag (Nathan Walters).

    • Add new entries to the FAQ guide (James Balamuta).

    • Add an example question containing code shown in the element documentation (James Balamuta).

    • Add example questions for pl-multiple-choice and pl-integer-input customizations (James Balamuta).

    • Add users_select_or_insert SPROC tests (Dave Mussulman).

    • Add clientFilesElement folder for loading element-specific client files (Nicolas Nytko).

    • Add ignore-case option to pl-string-input to allow for case insensitivity (James Balamuta).

    • Add dependabot status to README (Matt West).

    • Add tabs for course admin page (Tim Bretl).

    • Add in-browser editing of course files (Tim Bretl).

    • Add question score information to all_submissions CSV download (Matt West).

    • Add warning to pl-checkbox if partial-credit-method is set but partial-credit is not enabled (Nathan Walters).

    • Change "Save & Grade" button text and alignment (Dave Mussulman).

    • Change Ace editor to use source files from npm and upgrade to 1.4.1 from 1.2.8 (Nathan Walters).

    • Change external grading to receive results from an SQS queue instead of a webhook (Nathan Walters).

    • Change Exam question generation to first-access time (Matt West).

    • Change assessment access rule examId linking to examUuid (Dave Mussulman).

    • Change example question fibonacciEditor timeout to 20 s (Matt West).

    • Change server timeout to 10 minutes (Matt West).

    • Change API ID names to contain object type (Matt West).

    • Change API object property names for improved consistency (Matt West).

    • Change highlight.js from 9.12.01 to 9.13.1 in order to support plaintext highlighting (Nathan Walters).

    • Change all packages to current versions (Matt West).

    • Change logging format for new winston version (Matt West).

    • Change instructor gradebook to have more optimized HTML for a smaller response (Nathan Walters).

    • Change "timeout" external grader error to sound like the student's code is at fault (Matt West).

    • Change cheerio back to v0.22.0 (Nathan Walters).

    • Change pl-matrix-output to pl-variable-output (Liz Livingston).

    • Change string_from_2darray() to string_from_numpy(), retained deprecated version (Liz Livingston).

    • Change sync procedural steps to use fetch and reset to allow for history changes (James Balamuta).

    • Change element documentation to have a separation between submission, decorative, and conditional elements (James Balamuta).

    • Change instructor question page to hide "Test 100 times" for externally graded questions (Nathan Walters).

    • Change element documentation to follow a common structure (James Balamuta).

    • Change JSON schemas to be independently publishable from PrairieLearn (Nathan Walters).

    • Change Travis CI to recognize dependabot rather than greenkeeper (Matt West).

    • Change developer docs to recommend the use of async/await (Matt West).

    • Change syncing process to be faster (Nathan Walters).

    • Change syncing process to allow for tags/topics that are not explicitly listed in courseInfo.json (Nathan Walters).

    • Change UUIDs to no longer be globally unique; they are not unique only in the smallest possible scope (Nathan Walters).

    • Change syncing process to validate that QIDs are not repeated in an assessment; this is a potentially breaking change (Nathan Walters).

    • Change to PostgreSQL version 11 (from version 10) (Matt West).

    • Change to NodeJS version 12 (from v10) (Matt West).

    • Change enroll page interface to allow Bootstrap modal dialogues instead of popover tooltips with buttons on them; add more verbose description of what it means to add/remove a course. (Eric Huber)

    • Change file editor to simplify the use of drafts and to improve the user interface (Tim Bretl).

    • Fix load-reporting close during unit tests (Matt West).

    • Fix PL / scheduler linking stored procedure to allow linked exams and fix bugs (Dave Mussulman).

    • Fix responsiveness and centering of images displayed with pl-figure (James Balamuta, h/t Dave Mussulman).

    • Fix STDERR data logging on Python start (Matt West).

    • Fix HTML on LTI configuration page (Matt West).

    • Fix LTI configuration flow configuration (Matt West).

    • Fix GitHub links to exampleCourse questions (Dave Mussulman).

    • Fix exclude file list for code coverage (Matt West).

    • Fix dump_filter.sh to keep authn_users in all tables (Matt West).

    • Fix issues link on instructor question page (Nathan Walters).

    • Fix users.lti_course_instance_id foreign key delete action (Matt West).

    • Fix CSV stringifier which blocks the event loop (Yuchen Pang).

    • Fix missing event-stream dependency (Matt West).

    • Fix pl.inner_html(...) helper function (Nathan Walters).

    • Fix slow gradebook API by removing last_submission_date (Matt West).

    • Fix API IDs to be JSON integers (Matt West).

    • Fix underscore in pl-string-input docs (Matt West).

    • Fix Python linter errors in (Matt West).

    • Fix pl-code HTML escaping (Nathan Walters).

    • Fix legacy question renderer by explicitly using htmlparser2 for cheerio (Nathan Walters).

    • Fix error message when a tag is missing (Matt West, h/t Mariana Silva).

    • Fix GitHub links in mkdocs.yml (Eric Huber).

    • Fix typo in documentation (Eric Huber).

    • Fix docs for examUuid usage (Matt West).

    • Fix htmlparser2 config by copying default options from Cheerio (Nathan Walters).

    • Fix traceback in console log for python errors (Tim Bretl).

    • Fix render cache stats to limit to last day (Matt West).

    • Fix escape sequence of code specified in the source-file-name options of pl-code (James Balamuta).

    • Fix local grader not removing volumes associated with containers (Nathan Walters).

    • Fix Python autograder container build (Matt West).

    • Fix documentation to be more descriptive for local development with externally graded questions, especially in Windows. (Dave Mussulman, h/t James Balamuta, Mariana Silva, Zhenxi Zhou)

    • Fix copy button (Tim Bretl).

    • Fix python question random to seed from variant.variant_seed (Dave Mussulman).

    • Fix TravisCI for Greenkeeper PRs (Matt West).

    • Fix vulnerabilities in node packages (Nathan Walters).

    • Fix regression from #1440 in Bootstrap popovers due to HTML sanitization (Matt West).

    • Fix elements to work with the new sanitized popovers (Matt West).

    • Fix documentation build on Read the Docs (Matt West).

    • Fix editing popovers to work with the new sanitization defaults (Matt West).

    • Fix tools/generate_uuids.py to not add UUID in element subdirectory (Pavitra Shadvani).

    • Fix tools/generate_uuids.py to be able to find uppercase UUIDs (Eric Huber).

    • Fix gradebook download link for courses with special characters in their names (Nathan Walters).

    • Fix handling of malformed LTI responses (Matt West).

    • Fix (or at least attempt to) S3 file uploads for external grading (Nathan Walters).

    • Fix handling of binary files during external grading (Nathan Walters).

    • Fix hljs syntax highlighting compatibility issue in pl-code.py (Eric Huber).

    • Fix JSON format when dumping DB subsets with dump_filter.sh (Matt West).

    • Fix vulnerabilities in node packages (Dave Mussulman).

    • Fix users_select_or_insert to handle NetID changes with same UIN (Dave Mussulman).

    • Fix documentation page for elements and their dependencies (Eric Huber).

    • Fix question tag syncing to be significantly faster (Nathan Walters).

    • Fix generate_uuids.py to only process files starting with info (Matt West).

    • Fix async.doWhilst() and async.doUntil() for async v3 (Matt West).

    • Fix best submissions downloads to use ungraded submissions as a last resort (Matt West).

    • Fix help text CSV upload example with points (Matt West, h/t Mariana Silva and James Balamuta).

    • Fix CSRF checking for external grading live updates (Nathan Walters).

    • Fix flaky test cases in pl-number-input which didn't handle comparison options properly (Mingjie Zhao).

    • Remove allowIssueReporting option in infoCourseInstance.json (Matt West).

    • Remove old temporary upgrade flag tmp_upgraded_iq_status (Matt West).

    • Remove string_from_2darray_sf() from freeformPythonLib/prairielearn.py (Liz Livingston)

    • Remove number column from question_tags table; question tags are now sorted by tags.number (Nathan Walters).

    • Remove support for externalGradingOptions.files in question info.json files (Nathan Walters).

    • Remove number column and the corresponding uniqueness constraint from jobs table (Tim Bretl).

  • 3.1.0 - 2018-10-08

    • Add string input element (Mariana Silva).

    • Add element to display matrix in latex format (Mariana Silva).

    • Add student name and clickable e-mail address information to issue reports (James Balamuta).

    • Add tools/dump_* scripts to filter and anonymize per-course dumps (Matt West).

    • Add pl-prairiedraw-figure element and update PrairieDraw graphics documentation. (Ray Essick).

    • Add Control-C hint on server startup (Dave Mussulman).

    • Add improved login screen (Nathan Walters).

    • Add pl-matrix-component-input element (Mariana Silva).

    • Add new question renderer behind feature flag (Nathan Walters).

    • Add partial credit option to pl-checkbox element (Mariana Silva).

    • Add docs and two optional attributes, display and label, to pl-symbolic-input (Tim Bretl).

    • Add prevent-select attribute to pl-code element (Nathan Walters).

    • Add personal access token management (Nathan Walters).

    • Add maxPoints option to zones (Tim Bretl).

    • Add bestQuestions option to zones (Tim Bretl).

    • Add allow-complex attribute for pl-symbolic-input (Tim Bretl).

    • Add warm up for Python worker processes (Matt West).

    • Add better handling of client sockets on externally graded questions (Nathan Walters).

    • Add postgresql permissions for root in Docker for development (Dave Mussulman).

    • Add CSV scores upload for questions or assessments (Matt West).

    • Add Pillow to the centos7-python container (Dave Mussulman).

    • Add more question and assessment JSON validity checking on load (Dave Mussulman).

    • Add scroll bar in pl-matrix-component-input (Mariana Silva)

    • Fix pl-file-editor to allow display empty text editor and add option to include text from source file (Mariana Silva).

    • Fix HTML rendering by reverting cheerio.js to 0.22.0 (Matt West).

    • Fix Google auth using new API (Matt West).

    • Fix several issues with various elements (Nathan Walters).

    • Fix error when rendering ungraded external grading submissions (Matt West).

    • Fix sync failure if a course instance has no assessments directory and add warning in sync log (Ray Essick).

    • Fix Slack posting for student cheating reports (Matt West).

    • Fix assessment instance page to only show 'Finish assessment' button for password and SEB exams (Dave Mussulman).

    • Fix assessment time limits (Matt West).

    • Fix copy button after clipboard.js package update (Tim Bretl).

    • Fix pl-multiple-choice so feedback is inside label and so inline option produces valid HTML (Tim Bretl).

    • Fix "Logout" button with Google authentication (Matt West).

    • Fix error message when an authentication method is not enabled (Matt West).

    • Fix "Logout" button with Azure authentication (Matt West).

    • Fix docs for clientServerFiles template variables (Rahul Rameshbabu).

    • Fix bug with rendering when the render cache is disabled (Nathan Walters).

    • Fix outdated pycryptdome version (to 3.6.6) (Matt West).

    • Fix bug in pl-symbolic-input to handle submission of function names without arguments (Tim Bretl).

    • Fix bug in pl-symbolic-input to handle submissions that simplify to invalid expressions (Tim Bretl).

    • Fix bug in pl-symbolic-input to handle the sympy constants I and E properly (Tim Bretl).

    • Fix markup in pl-multiple-choice and pl-checkbox elements (Nathan Walters).

    • Fix slow v3 questions by using persistent forking python processes (Matt West).

    • Fix spurious warnOldJobs log entries (Matt West).

    • Fix label on pl-string-input help popover (Matt West).

    • Fix restart of Python codeCallers with no active child (Matt West).

    • Fix exampleCourse exam1 to include formula sheet example per docs (Dave Mussulman).

    • Fix docs for allowIssueReporting (Matt West).

    • Fix pl-matrix-component-input element to adjust height (Mariana Silva).

    • Fix real-time external grading results in exam mode by disabling exam-specific message in the question score panel (Nathan Walters).

    • Fix tools/dump_filter.sh to drop pg_stat_statements for PostgreSQL 10 (Matt West).

    • Fix slow assessment instance deletes (Matt West).

    • Fix triangularDistributedLoad in PrairieDraw.js (Mariana Silva).

    • Fix unexpected token error in administrator overview page (Tim Bretl).

    • Fix pl-matrix-component-input rendering bug on Safari (Nicolas Nytko).

    • Change pl-code to display code from a source file OR inline text (Mariana Silva).

    • Change element names to use dashes instead of underscores (Nathan Walters).

    • Change deprecated new Buffer() calls to Buffer.from() (Ray Essick).

    • Change to Node.js 10 and PostgreSQL 10 (Matt West).

    • Change centos7-ocaml grader image to ocaml-4.05 (Matt West).

    • Change TravisCI tasks to run linters first (Matt West, h/t James Balamuta).

    • Change element attributes to use hyphens instead of underscores (Nathan Walters).

    • Change assessment password protection method (Dave Mussulman).

    • Change "0 rows" error to be more descriptive (Dave Mussulman).

    • Change Exam authentication options to always include Google and Azure (Matt West).

    • Change maximum JSON POST size to 1MB (Nathan Walters).

    • Change to prohibit extra allowAccess properties (Geoffrey Challen).

    • Change maximum JSON POST size to 1MB or local grader (Nathan Walters).

    • Change required package versions for security (Dave Mussulman).

    • Change allowIssueReporting to default to true (Matt West).

    • Change pl-string-input to include an attribute for the placeholder (Mariana Silva).

    • Change element documentation to add placeholder attribute to pl-string-input (Mariana Silva).

    • Change instructor assessment page into multiple sub-pages (Matt West).

    • Change log level of external grading jobs to reduce syslog volume (Matt West).

    • Change test cases to use templated DB for faster performance (Dave Mussulman).

    • Remove element_index from list of arguments passed to elements (Tim Bretl).

  • 3.0.0 - 2018-05-23

    • Add improved support for very large file downloads (Nathan Walters).

    • Add support for running in production inside Docker (Matt West).

    • Add configurable authentication sources menu (Dave Mussulman).

    • Add locking to enable multi-server deployments (Matt West).

    • Add per-assessment PrairieSchedule exam linking (Matt West).

    • Add "Report cheating" page in Exam mode (Matt West).

    • Add package-lock.json to Docker image build (Matt West).

    • Add additional information about indices to database descriptions (Nathan Walters).

    • Add configurable homeUrl to support container deployments (Matt West).

    • Add caching of rendered question panels (Nathan Walters).

    • Fix migration 111 to allow re-running (Matt West).

    • Fix docs to provide workaround for mcrypt install error on OSX (Tim Bretl).

    • Change popper.js to version 1.14.0 (Tim Bretl).

  • 2.12.0 - 2018-05-19

    • Add new issues page style and flexible filtering (Nathan Walters).

    • Add pl_threejs element (Tim Bretl).

    • Add translation to pl_threejs element (Tim Bretl).

    • Add pl_code element for code syntax highlighting (Matt West).

    • Add FAQ docs about post-semester access (Matt West).

    • Add handling of complex numbers to pl_number_input, pl_matrix_input, and pl_matrix_output (Tim Bretl).

    • Add more questions to unit tests (Tim Bretl).

    • Add guidance on how to update ChangeLog to docs in contributing.md (Tim Bretl).

    • Add server load reporting to CloudWatch (Matt West).

    • Add question QR code for proctor lookup during exams (Dave Mussulman).

    • Add course-instance-wide issue reporting flag (Matt West).

    • Add advertisement for HackIllinois 2018 (Matt West).

    • Add blocked-event-loop monitor (Matt West).

    • Add per-job load tracking (Matt West).

    • Add R to the centos7-plbase Docker Image (James Balamuta).

    • Add centos7-plbase Docker image (Matt West).

    • Add memory and CPU limits to local external graders (Matt West).

    • Add tools/ to Docker image (Matt West).

    • Add docs for generating LaTeX label images with Docker (Matt West).

    • Add option to enable networking access on external grading containers (Nathan Walters).

    • Add sympy.ImmutableMatrix to list of types accepted by prairielearn.to_json() (Tim Bretl).

    • Add form help text indicating multiple answer can be selected for pl_checkbox (James Balamuta).

    • Add demo question showcasing all options for pl_checkbox (James Balamuta).

    • Add example of how to use PL to learn student names (Tim Bretl).

    • Add exception handling to python caller to display what can't be converted to valid JSON (Tim Bretl).

    • Add tags list to question stats CSV (Matt West).

    • Add Redis to support websockets when running with multiple servers (Nathan Walters).

    • Add support for dtype in pl.to_json and pl.from_json (Tim Bretl).

    • Add better grading-instance autoscaling calculations (Matt West).

    • Add student page view tracking (Matt West).

    • Add predictive grader autoscaling (Matt West).

    • Add links to student questions on instructor assessment instance page (Matt West).

    • Add Safe Exam Browser support (Dave Mussulman).

    • Add instance question durations to CSV output (Matt West).

    • Add load-testing script (Matt West).

    • Add documentation for the shuffleQuestions option (Matt West).

    • Add course instance id to all question variants (Nathan Walters).

    • Add docs for external grading statistics (Matt West).

    • Add ability to restore original file in pl_file_editor (Nathan Walters).

    • Add pl_integer_input element (Tim Bretl).

    • Add consistency checks for course_instance_id in variants (Matt West).

    • Add merge=union strategy for ChangeLog.md (Matt West).

    • Add developer docs about question rendering (Matt West).

    • Add submission info modal with external grading stats (Nathan Walters).

    • Add load-test support for v2 questions (Matt West).

    • Fix broken file upload element (Nathan Walters).

    • Fix broken popover and improve assessment label styles (Nathan Walters).

    • Fix bug in pl_matrix_input that crashed on submission of large integers (Tim Bretl).

    • Fix broken popovers in input elements (Tim Bretl).

    • Fix bug in pl_threejs that applied different error tolerances to render and grade (Tim Bretl).

    • Fix bug in pl_threejs that showed wrong body position in answer panel (Tim Bretl).

    • Fix bug in pl_threejs to handle case when submitted answer is None (Tim Bretl).

    • Fix doc to clarify the rules for changing UUIDs (James Balamuta).

    • Fix issues on instructor question page (Nathan Walters).

    • Fix styling of file upload element (Nathan Walters).

    • Fix Google OAuth login (James Wang).

    • Fix unicode symbols and HTML entities in question.html (Matt West).

    • Fix bug in addBinary example question (Tim Bretl).

    • Fix error message for display attribute of pl_number_input (Matt West).

    • Fix bug in handling of MATLAB format in answers submitted to pl_matrix_input (Tim Bretl).

    • Fix request load tracking (Matt West).

    • Fix test-server shutdown procedures (Matt West).

    • Fix readthedocs build (Matt West).

    • Fix course role edit icon (Nathan Walters).

    • Fix Coveralls.io reporting (Dave Mussulman).

    • Fix tag order display (Dave Mussulman, h/t Pengyu Cheng).

    • Fix navbar role switching button text (Dave Mussulman).

    • Fix all calls of json.dumps to make them produce valid JSON (Tim Bretl).

    • Fix error when rendering question score panel (Nathan Walters).

    • Fix questions without tags not displaying on instructor assessment page (Jake Bailey).

    • Fix daily external grader statistics to split out receive time (Matt West).

    • Fix crash in pl_external_grader_results caused by malformed results (Nathan Walters).

    • Fix question order on instructor assessment instance page (Matt West).

    • Fix bug in display of input element tolerances (Tim Bretl).

    • Fix variants.course_instance_id migration (Matt West).

    • Fix typo in exampleCourse/questions/positionTimeGraph (Matt West).

    • Fix 'Load from disk' works when emulating non-instructor roles (Dave Mussulman).

    • Fix slow query for file downloads (Matt West).

    • Fix external grading documentation to describe the current code (Nathan Walters).

    • Change to Bootstrap 4 (Nathan Walters).

    • Change to NodeJS 8.x LTS (Matt West).

    • Change all node dependencies to latest versions (Nathan Walters).

    • Change sigfig and decdig method of comparison to reduce tolerance (Tim Bretl).

    • Change default relative tolerance from 1e-5 to 1e-2 (Tim Bretl).

    • Change question card coloring and collapse past submissions by default (Nathan Walters).

    • Change build process so Travis fails if changelog has not been updated (Nathan Walters).

    • Change build process to verify changelog update only on PR (Nathan Walters).

    • Change all required python packages to latest minor versions (Tim Bretl).

    • Change all bare except: to except Exception: in python code (Tim Bretl).

    • Change Docker build to start from centos7-plbase (Matt West).

    • Change requirements.txt to include rpy2 (James Balamuta).

    • Change to Python 3.6 in centos7-base grader image (Matt West).

    • Change pl_checkbox to display form help text by default (James Balamuta).

    • Change authenication redirects to preserve originally visited URL (Dave Mussulman).

    • Change Docker postgresql to do initializations/migrations at build (Dave Mussulman).

    • Change the example course to be available to any institution (Matt West).

    • Change centos7-plbase docker image to not use /PrairieLearn directory (Matt West).

    • Change shared code to be in external PrairieLib library (Nathan Walters).

    • Change instructor issues page to show student message on new line; remove is:automatically-reported filter (Nathan Walters).

    • Change CSRF codes to be URL-safe (Dave Mussulman).

    • Change closed exams to not be reviewable for students (Dave Mussulman).

    • Remove HackIllinois advertisement (Matt West).

  • 2.11.0 - 2017-12-29

    • Add support for partial credit in Homeworks (Tim Bretl).

    • Add help text to Exam assessment instance page (Tim Bretl).

    • Add support for partial credit in exams (Tim Bretl).

    • Add <pl_file_preview> element (Nathan Walters).

    • Add docker image for external graders with clang (Nathan Walters).

    • Add new exam grading UX with no buttons on overview page (Matt West).

    • Add Travis CI running the docker image for consistency (Matt West).

    • Add better and faster docker re-builds (Jake Bailey).

    • Add ZJUI as a institution option (Matt West).

    • Add python linter (Nathan Walters).

    • Add ESLint for style checking and fix related issues (Nathan Walters).

    • Add test coverage reporting with coverage.io (Nathan Walters).

    • Add documentation clarification on "role": "Student" access.

    • Add more core libraries (backbone, PrairieDraw, etc) (Matt West).

    • Add hiding of "Grade" button for manual grading (Matt West).

    • Add docs example of mixed on-campus and remote exam (Matt West).

    • Add Azure AD authentication (Matt West).

    • Add ZJU institution checking from ID (Matt West).

    • Add logout support for multiple authentication providers (Matt West).

    • Add PrairieGrader for external grading (Nathan Walters).

    • Add redirect handler to enable assessment deep links (Dave Mussulman).

    • Add pycryptodome for authenticated question data (Jake Bailey).

    • Add v2 and v3 tags to exampleCourse questions (Dave Mussulman).

    • Add externalGradingOptions.timeout parameter (Nathan Walters).

    • Add "Report an issue" button on questions (Matt West).

    • Add allowIssueReporting assessment option, default false (Matt West).

    • Add more statistics for external grader instances (Matt West).

    • Add "generating" animation to "Start assessment" button (Matt West).

    • Add maximum statistics for grading jobs (Matt West).

    • Add index on grading_jobs.date to speed up statistics (Matt West).

    • Add to_json() and from_json() to prairielearn.py to help JSON serialize standard types (Tim Bretl).

    • Add build-time system updates to Docker image (Jake Bailey).

    • Add new UINs for dev users to avoid conflicts in production DB (Matt West).

    • Add partialCredit question option (Matt West).

    • Add jsPlumb library from PL v1 (Matt West).

    • Add ability to de-link course instances from PrairieSchedule (Matt West).

    • Add explicit POST size limit of 200 KiB (Matt West).

    • Add size limits for grading jobs (100 KiB) (Nathan Walters).

    • Add linting for trailing commas (Nathan Walters).

    • Add GitHub link to instructor question view (Dave Mussulman).

    • Add instructor view of external grading logs (Nathan Walters).

    • Add legacy file path fallback to clientFilesCourse (Matt West).

    • Add full grading job log display from S3 (Nathan Walters).

    • Add instructor editing of total points and question points for assessment instances (Matt West).

    • Add addBinary example question (Matt West).

    • Add make to the Docker container (Dave Mussulman).

    • Add more feedback when submission to pl_symbolic_input has invalid format (Tim Bretl).

    • Add live update of external grading results (Nathan Walters).

    • Add ability for user to switch between MATLAB and python format in pl_matrix_output (Tim Bretl).

    • Add copy-to-clipboard button in pl_matrix_output (Tim Bretl).

    • Add detailed question statistics (Paras Sud).

    • Add visible logging for incremental DB migrations (Matt West).

    • Add support for python format in pl_matrix_input (Tim Bretl).

    • Add student and instructor question links on instructor page (Matt West).

    • Add new python grading framework for exampleCourse (Nathan Walters).

    • Add CSV export of best (highest scoring) submissions (Matt West).

    • Add CSV download for instance questions (Matt West).

    • Split installing documentation into separate method sections (Matt West).

    • Remove unused dead code (/lib/db.js, question-servers/shortAnswer.js, and tests/sync/*) (Nathan Walters).

    • Remove cookie-clearing on error page (Matt West).

    • Remove old unused Python caller code (Tim Bretl).

    • Remove AWS Batch external grader (Nathan Walters).

    • Remove the need for <pl_variable_score> in questions (Tim Bretl).

    • Remove detailed AzureAD logging (Matt West).

    • Remove the need to return data in python functions (Tim Bretl).

    • Change externalGradingOptions.files to .serverFilesCourse (Nathan Walters).

    • Change Python question code timeout from 5 s to 20 s (Tim Bretl).

    • Change "Errors" tab to "Issues" (Matt West).

    • Change max DB connections from 10 to 100 (Matt West).

    • Shift most exampleCourse to the external pl-template repository.

    • Shift symbolic input parser to lib/python_helper_sympy.py (Tim Bretl).

    • Fix external graders with invalid submissions (Nathan Walters).

    • Fix handling of too-large file uploads (Matt West).

    • Fix rendering glitch in instructor question table (Matt West).

    • Fix instructor closing of assessment instances (Matt West).

    • Fix spurious "question is complete" bug (Tim Bretl).

    • Fix bug in sigfig method of comparison when correct answer is zero (Tim Bretl).

    • Fix bug in pl_file_upload where students could upload arbitrary files (Nathan Walters).

    • Fix render bug on exams for questions without points (Matt West).

    • Fix assessment authorization when mode is NULL (Matt West).

    • Fix bug that prevented scalars from being rendered by pl_matrix_output (Tim Bretl).

    • Fix bug that prevented unicode minus from being parsed by pl_matrix_output and pl_number_input (Tim Bretl).

    • Fix external grading score display when score is missing (Nathan Walters).

    • Fix handling of image pull fails for external grading (Nathan Walters).

    • Fix options for v3 questions (Jake Bailey).

    • Fix course element reloading on sync (Nathan Walters).

    • Fix course element file loading (Matt West).

    • Fix file downloads as zip for v2 questions (Matt West).

    • Fix exam instance error handling with broken variants (Tim Bretl).

    • Fix pl_number_input to allow suffix for units with display=inline (Tim Bretl).

    • Fix symbolic input parser to eliminate use of sympy.sympify (Tim Bretl).

    • Fix bug that prevented numbers from being converted in sympy equivalents in symbolic input parser (Tim Bretl).

    • Fix bug that prevented use of multiple symbols in pl_symbolic_input (Tim Bretl).

    • Fix inoperable "Test" buttons for non-v3 questions by hiding them (Matt West).

    • Fix inaccurate issue counts on assessments (Matt West).

    • Fix exam auto-closing issue with legacy assessment instances (Matt West).

    • Fix double-click handling on question buttons (Matt West).

    • Fix one broken exam from blocking other exams auto-closing (Matt West).

    • Fix v2 questions clientCode path on Exam assessments (Matt West).

    • Fix decreased Exams scores with reduced credit (Matt West).

    • Fix premature answer display for pl_multiple_choice and pl_checkbox (Matt West).

    • Fix broken popovers in student exam questions (Tim Bretl).

    • Fix canceling of grading jobs on a new submission (Matt West).

    • Fix symbolic expression parsing bug by disallowing floating-point numbers (Tim Bretl).

    • Fix handling of broken questions on Homeworks (Matt West).

    • Fix handling of inf and nan submissions in pl_number_input (Tim Bretl).

    • Fix server crash in grading job handling (Nathan Walters).

    • Fix a few very old submissions with NaN scores (Matt West).

    • Fix assessment re-open/close link rendering (Nathan Walters).

    • Fix null-byte handling in grader results (Nathan Walters).

    • Fix elements not reading their templates with UTF-8 encoding (Nathan Walters).

    • Fix display of assessment score to 2 decimal places (Nathan Walters).

    • Fix gradebook to choose best score rather than worst (Matt West).

    • Fix bug in pl_number_input that crashed on submission of large integers (Tim Bretl).

  • 2.10.1 - 2017-05-24

    • Fix display of saved submissions for Exam assessments.

  • 2.10.0 - 2017-05-20

    • Add real-time grading job status with websockets (Nathan Walters).

    • Add full DB schema migration system (Nathan Walters).

    • Add unit tests for DB migrations (Nathan Walters).

    • Add Python modules for autograders: numpy, scipy, matplotlib, sympy, and pandas (Jordi Paris Ferrer).

    • Add scipy and numpy to the PL docker image.

    • Add documentation on the new authentication flow.

    • Add more developer documentation on the database schema.

    • Add export of full database in CSV, optionally anonymized.

    • Use Python 3.5 for autograders in exampleCourse (Nathan Walters).

    • Fix docker build script usage help.

    • Fix base64 encoding of uploaded files.

  • 2.9.1 - 2017-05-17

    • Fix handling of failed grading jobs (Nathan Walters).

  • 2.9.0 - 2017-05-14

    • Add support for Google OAuth2 authentication.

    • Shift documentation to Read the Docs.

    • Fix handling of Unicode characters in question data.

  • 2.8.0 - 2017-05-04

    • Add DB storage of exam mode networks.

    • Add config table to DB with system display_timezone.

    • Fix async handling in regrading unit tests.

  • 2.7.0 - 2017-04-28

    • Add /pl/webhooks/ping endpoint for automated health checks.

    • Add singleVariant flag for non-randomized questions.

    • Add documentation and improve layout for external autograder files (Nathan Walters).

    • Add link to detailed instances CSV file on instructor assessment page.

    • Add more assessment CSV download options.

    • Allow development use of non-master git branches for courses.

    • Fix max_points update during regrading.

    • Fix env var security in autograder containers (Jordi Paris Ferrer).

    • Fix external autograder output display (Nathan Walters).

    • Fix home directory detection for external autograder jobs.

    • Fix rendering of table row lines in student question lists.

  • 2.6.0 - 2017-04-16

    • Add full external autograder support with AWS and local docker support (Nathan Walters, Jordi Paris Ferrer).

  • 2.5.3 - 2017-04-14

    • Fix docker build with migrations/ directory.

  • 2.5.2 - 2017-04-14

    • Fix regrading support.

  • 2.5.1 - 2017-04-12

    • Fix Exam reservation enforcement when multiple reservations exist.

  • 2.5.0 - 2017-04-11

    • Speed up rendering of instructor pages with assessment statistics.

    • Speed up calculation of assessment durations.

    • Speed up pages with job sequences.

    • Add per-day mean scores to the by-day score plot.

    • Add points and max_points output to assessment_instances CSV.

    • Add migrations/ directory for ordered DB schema changes.

    • Fix assessment duration estimation for homeworks (1-hour gap maximum).

    • Fix CSV link on gradebook page.

    • Fix sorting of assessment on gradebook page.

    • Fix CSV download on instructor assessments overview page.

    • Fix date format in activity log CSV.

    • Fix links to questions on activity log pages.

    • Remove "permanent URL" on instructor assessments overview page.

  • 2.4.1 - 2017-04-08

    • Set question feedback to the empty object when missing.

  • 2.3.2 - 2017-04-08

    • Set question feedback to the empty object when missing.

  • 2.4.0 - 2017-04-07

    • Add connection to PrairieSchedule to enforce Exam reservations.

    • Fix ordering of assessment set headers in assessment lists.

    • Fix duration calculations to be from assessment start to last submission.

    • Show all submissions in downloaded CSV files even in dev mode.

    • Fix Manual grading type (Jake Bailey).

    • Change forceMaxPoints to only take affect during an explicit regrade.

  • 2.3.1 - 2017-03-23

    • Don't display deleted courses on the enroll (add/remove courses) page.

  • 2.3.0 - 2017-03-08

    • Change feedback to be visible for open questions on exams.

    • Make feedback visible within submission.html (Ray Essick).

    • Fix auto-finishing of exams after a 6-hour timeout.

    • Add regrading support with forceMaxPoints option.

    • Add preliminary external autograder support by the HackIllinois team (Genna Helsel, Teju Nareddy, Jordi Paris Ferrer, Nathan Walters).

    • Add question points and percentage scores to *_final_submissions.csv.

    • Add per-day score histograms to instructor assessment page (Paras Sud).

  • 2.2.2 - 2017-02-23

    • Add more indexes and improve unique constraint ordering for indexes.

  • 2.2.1 - 2017-02-18

    • Only show feedback for open exams in CS 233.

  • 2.2.0 - 2017-02-18

    • Show feedback for graded questions on exams, even if exam is still open (Jake Bailey).

  • 2.1.3 - 2017-02-17

    • Prevent multiple submissions to a single homework question variant.

    • Fix option passing to question server.js functions.

    • Fix course deletion on Admin page.

  • 2.1.2 - 2017-02-15

    • Catch bad Shibboleth authentication data with "(null)" UID.

    • Fix logging of instance_question_id in response.

  • 2.1.1 - 2017-02-13

    • Update ChangeLog.

  • 2.1.0 - 2017-02-13

    • Fix division-by-zero error in homeworks when max_points is zero (Jake Bailey).

    • Fix typos in documentation (Andre Schleife).

    • Fix MTF questions.

    • Fix assessment links on Instructor Gradebook page.

    • Fix XSS vulnerability by storing questionJson in base64.

  • 2.0.3 - 2017-02-04

    • Cache instance_questions.status to speed up page loads.

  • 2.0.2 - 2017-02-04

    • Speed up SQL query in instance_questions authorization.

  • 2.0.1 - 2017-01-28

    • Fix incorrect max_points for homeworks with question alternatives.

  • 2.0.0 - 2017-01-13

    • Make v2 the primary version and shift the old v1 to a subdirectory.

    • Add support for syncing a course from a remote git repository.

    • Add dev mode with local disk syncing and other dev features.

    • Convert score_perc to double (instead of integer).

    • Add UUIDs to all input JSON files to support renaming.

    • Convert all DB tables to bigserial primary keys.

    • Add docker build for course development.

    • Add question difficulty vs discrimination plots (Paras Sud).

    • Add 'Administrator' users will full site access.

    • Standardize names of JSON files and client/server file directories.

    • Clean up JSON file formats for everything except questions.

    • Add documentation for all v2 file formats.

    • Add conversion script from v1 to v2 assessment format (Dallas Trinkle).

  • 1.22.0 - 2016-12-09

    • Add IP ranges for final exams in DCL.

    • Fix docker instructions (Allen Kleiner).

    • Skip update of test instances for non-existent tests.

    • Fix crashing bug due to function call typo (Kevin Wang).

    • Don't attempt to generate statistics for non-existent questions.

    • Improve robustness of submittedAnswer restore for Fabric.js questions.

    • Add fixedExponential formatter.

    • Add raw score (full precision) to CSV downloads.

    • Fix logging error (Eric Huber).

    • Generate hi-res versions of LaTeX images for Fabric.js support.

    • (V2) Enable assessments with multiple instances per student.

    • (V2) Fix submission rendering for admin question views (Ray Essick).

    • (V2) Add past submissions view on exam question pages (Ray Essick).

    • (V2) Add underlying support for external (RabbitMQ) and manual grading.

    • (V2) Fix grading operations outside the main transaction.

    • (V2) Add question alternatives within assessments.

    • (V2) Implement generic CSRF protection for all pages.

    • (V2) Split site into Admin and User pages.

    • (V2) Add unified homepage with course list and self-enrollment.

    • (V2) Fix SQL import newline handling on Windows.

    • (V2) Add docker build.

    • (V2) Add admin view of individual assessment instances.

  • 1.21.0 - 2016-09-14

    • Use hi-res time for random seeds, improving test randomization.

    • Improve margins around Save answer buttons (Eric Huber).

    • Improve sorting of tests with identical numbers to sub-sort on titles.

    • Fix handling of question shuffling within tests (Binglin Chen).

    • Fix user role reading from courseInfo.json.

    • Fix error-handling code in POST /submissions.

    • Remove Siebel 0224 from Exam mode (Jeffrey Tolar).

    • (V2) Automatically regenerate assessment statistics every 10 minutes.

    • (V2) Fix CSV statistics downloads.

    • (V2) Switch to local copy of MathJax.

    • (V2) Implement access date display.

    • (V2) Implement Exam and Homework assessment types.

  • 1.20.0 - 2016-08-24

    • Fix jsPlumb naming case (Jeffrey Tolar).

    • Remove /export.csv endpoint (Kevin Wang).

    • Explicitly specify dependency versions in package.json (Kevin Wang).

    • Validate effective UID before creating tInstances (Kevin Wang).

    • Fix display of trueAnswers for all questions (Kevin Wang).

    • Document the Reload button (Jeffrey Tolar).

    • Fix role changing restrictions (Jeffrey Tolar).

    • Improve naming of exam grade/finish buttons and modal texts (Kevin Wang).

    • Show zone titles within tests (Jeffrey Tolar).

    • Remove current exam score from sidebar (Kevin Wang).

    • Split out helper modules from server code (Jeffrey Tolar).

    • Warn user when exam has unanswered questions (Kevin Wang).

    • Improve user feedback when all exam questions are answered (Kevin Wang).

    • Fix viewport width handling (Jeffrey Tolar).

    • Upgrade to ExpressJS 4.x.

    • Disallow multiple submissions for a single homework question instance (Kevin Wang).

    • Fix all server-side error handling to use standard NodeJS convention (Kevin Wang).

    • Fix race condition on client initialization (Jeffrey Tolar).

    • Improve server-side RequireJS usage (Jeffrey Tolar).

    • Add submissions directly from the command line (Kevin Wang).

    • Improve docs for Windows installations (Dave Mussulman).

    • Expose PLConfig to backend to access server URL (Kevin Wang).

    • Fix crash on GET /clientFiles/ (Kevin Wang).

    • Fix handling of large git pulls of class data (Jeffrey Tolar).

    • Fix mtfclient to properly handle checkbox listening (Terence Nip).

    • Fix percentage score exports.

    • Switch exam-mode IP blocks to new CBTF location in Grainger.

    • Add new drawing commands for LShape, TShape, DistLoad (Mariana Silva).

    • Store latex text images per-course rather than globally.

    • Add homework random shuffle mode with global question numbers (Binglin Chen).

    • (V2) Add experimental backend using PostgresQL and server-side rendering.

  • 1.19.0 - 2016-02-23

    • Add Ace editor for in-question code editing (Terence Nip).

    • Add MultipleTrueFalse question type (Terence Nip).

    • Upgrade MathJax to 2.6.0 to fix "vertical bar" rendering problem.

    • Add adm-zip support for questions to create zip files (Craig Zilles).

    • Enable embedded images in MultipleChoice and Checkbox question types.

    • Fix bugs related to reporting of PrairieLearn git version.

    • Add Errors tab for instructors to see server-side errors, and report more errors.

    • Add Reload button in development mode.

    • Add support for variable credit on tests (bonus credit and partial credit).

    • Remove the Adaptive test type (superseded by Game).

    • Add validation for dates on server load.

    • Fix display of question answer feedback during RetryExams.

    • Change all test scores to be stored as percentages without decimal places (rounded down).

    • Add {{params.a | vector}} template for bracketed vectors.

    • Support IP range checking for Siebel basement labs.

  • 1.18.0 - 2016-01-20

    • Fix security hole to restrict question access to accessible tests.

    • Add jsplumb support (Terence Nip).

  • 1.17.0 - 2015-11-04

    • Fix missing questionFile() caused by upgraded underscore templating.

    • Fix sorting of tests with mixed integer/string numbers.

    • Fix broken PrairieDraw figures after submission grading.

    • Fix role changes on User page with Firefox.

    • Fix username setting when UID is set.

    • Fix User page dropdowns to default to current state.

    • Add a User page button to change back to the authenticated UID.

    • Fix missing user list in dropdown after UID change.

    • Add "Troubleshooting" documentation page with frequently asked questions.

    • Add documentation about tests and questions versus test instances and question instances.

    • Add Checkbox question type.

    • Add exampleCourse/questions/randomZip example.

    • Remove unused backend/questions and backend/tests templates in favor of exampleCourse.

    • Include MathJax inside PrairieLearn.

    • Fix TeX label generation scripts to support Python 3.X and courseDir config variable.

  • 1.16.1 - 2015-10-12

    • Fix alignment of date plots on Safari.

  • 1.16.0 - 2015-10-12

    • Link questions on test "Admin" pages to question instances.

    • Add statistics by day for exam-type tests.

  • 1.15.2 - 2015-10-09

    • Fix doc references from "Assessment Detail" to assessment "Admin" page.

  • 1.15.1 - 2015-10-08

    • Clean up particleMotion example HTML templates.

  • 1.15.0 - 2015-10-08

    • Enable feedback in questions during exams and add particleMotion example.

  • 1.14.1 - 2015-10-08

    • Fix documentation typo in test access control section.

  • 1.14.0 - 2015-10-08

    • Add "uids" as an access rule restriction in test "allowAccess".

  • 1.13.2 - 2015-10-08

    • Use a locally-hosted copy of MathJax.

  • 1.13.1 - 2015-10-04

    • Fix test statistics for Exam and PracExam tests.

  • 1.13.0 - 2015-10-04

    • Plot score histogram in test admin view (Binglin Chen @chen386).

    • Add question statistics to test admin view.

    • Display PrairieLearn version number on the Sync page.

  • 1.12.1 - 2015-09-24

    • Fix test statistics for RetryExam using zones.

  • 1.12.0 - 2015-09-24

    • Standardize question numbering to be like #3.8 rather than #3-8 (Terence Nip @tnip).

    • Fix schema validation and example for RetryExams with multiple qids in a question.

  • 1.11.1 - 2015-09-23

    • Fix build bug with missing moment-timezone.

    • Remove deprecation warning for questionGroups in RetryExam.

  • 1.11.0 - 2015-09-23

    • Redesign of the "Assessment" page to be more compact and consistent.

    • Add zones to RetryExam to control question-order randomization.

    • Add variantsPerQuestion and unlimitedVariants options for RetryExam.

    • Improve test naming consistency and fix navbar link bugs with tests.

    • Allow test numbers to be strings.

  • 1.10.2 - 2015-09-19

    • Fix bug introduced by 1.10.1 that broke all tests (overly general change events).

  • 1.10.1 - 2015-09-18

    • Fix bug that caused the "User" page to not display changes in user, role, or mode.

  • 1.10.0 - 2015-09-15

    • Add "reset test" capability for instructors.

    • Only allow questions to be solved for accessible tests.

    • Add export test data capability for instructors.

    • Add summary test statistics for instructors.

  • 1.9.1 - 2015-09-11

    • Fix docs/example to add blank target for test text links.

    • Fix clientFiles to also handle subdirectories.

  • 1.9.0 - 2015-09-11

    • Add clientFiles and docs for adding text/files to tests.

  • 1.8.1 - 2015-09-10

    • Fix security hold where anyone could access /export.csv.

  • 1.8.0 - 2015-09-09

    • Add optional header text for RetryExam (for formula sheets, etc).

  • 1.7.6 - 2015-09-09

    • Load frontend website even if there were errors fetching data.

  • 1.7.5 - 2015-09-07

    • Reload all question server.js files after "Sync" with a git course repository.

  • 1.7.4 - 2015-09-06

    • Correctly give highest score for assessments with duplicate scores.

  • 1.7.3 - 2015-09-06

    • Fix bug that created multiple tInstances.

  • 1.7.2 - 2015-09-02

    • Fix exampleCourse/questions/addVectors to use QServer so gradeAnswer() is truly optional.

  • 1.7.1 - 2015-09-02

    • Fix schema links in documentation.

    • Add documentation for question options.

    • Add docs and text on the User page to describe the server mode in more detail.

  • 1.7.0 - 2015-09-01

    • Don't generate new question variants until the old variant is answered.

  • 1.6.0 - 2015-09-01

    • Make exampleCourse/tests/homework1 visible by default.

    • Display course name in page title.

    • Use "assessment" rather than "homework" or "test" in user-visible strings.

  • 1.5.2 - 2015-08-31

    • Fix example backend/config.json in the docs.

  • 1.5.1 - 2015-08-30

    • Clarify docs about user role setting.

  • 1.5.0 - 2015-08-26

    • Enable exam mode detection via hard-coded IP range for the CBTF.

  • 1.4.1 - 2015-08-26

    • export.csv now uses test set rather than type for test names.

  • 1.4.0 - 2015-08-25

    • Add documentation and help text for Sync page.

    • Fix display of commit information when using older versions of git.

    • Add figure to example question addVectors in exampleCourse.

  • 1.3.2 - 2015-08-24

    • Fix allowAccess checks to not always fail.

  • 1.3.1 - 2015-08-24

    • Fix pulls error when gitCourseBranch is not set.

  • 1.3.0 - 2015-08-24

    • Change default allowAccess to block all non-instructor access.

  • 1.2.1 - 2015-08-24

    • Fix race condition in user creation and correctly record user names.

  • 1.2.0 - 2015-08-23

    • Add "Sync" feature to pull from a git repository.

    • Fix missing template field in config.json schema.

    • Improve error logging with more specific error information.

  • 1.1.0 - 2015-08-22

    • Add access logging to the database.

  • 1.0.2 - 2015-08-19

    • Documentation fixes following the bootcamp.

    • Fix undefined logger error if config.json contains errors (reported by Craig and Mariana).

  • 1.0.1 - 2015-08-18

    • Fix npm module list during bootcamp (remove nodetime, add moment).

  • 1.0.0 - 2015-08-18

    • First public release for pre-Fall-2015 bootcamp.