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todo.rb
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todo.rb
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require "sinatra"
require "sinatra/reloader" if development?
require "sinatra/content_for"
require "tilt/erubis"
# this sets up Sinatra to use sessions
# if a value is not provided for `:session_secret`, Sinatra will generate a random
# session_secret everytime it starts. I.e., a different secret everytime the application
# is stopped and started again. Since the secret is used to verify the data stored
# in that session, if that secret value changes, then any session that exists will
# become invalid immediately. By providing a secret value, we make sure that any
# sessions that are created will continue to work no matter how many times we
# restart Sinatra.
configure do
enable :sessions
set(:session_secret, SecureRandom.hex(32))
set(:erb, :escape_html => true)
end
helpers do
def todos_remaining_count(list)
list[:todos].count { |todo| !todo[:completed] }
end
def todos_count(list)
list[:todos].size
end
def list_complete?(list)
todos_count(list) > 0 && todos_remaining_count(list) == 0
end
def list_class(list)
"complete" if list_complete?(list)
end
def sort_lists(lists, &block)
complete_lists, incomplete_lists = lists.partition { |list| list_complete?(list) }
incomplete_lists.each { |list| yield(list, lists.index(list)) }
complete_lists.each { |list| yield(list, lists.index(list)) }
end
def sort_todos(todos, &block)
complete_todos, incomplete_todos = todos.partition { |todo| todo[:completed] }
incomplete_todos.each { |todo| yield(todo, todos.index(todo)) }
complete_todos.each { |todo| yield(todo, todos.index(todo)) }
end
end
before do
session[:lists] ||= [] # if session[:lists] is falsey, set return value to `[]`
end
get "/" do
redirect "/lists"
end
# view all the lists
get "/lists" do
@lists = session[:lists]
erb(:lists, layout: :layout)
end
### old version of the above route
# get "/lists/new" do
# session[:lists] << { name: "new lists", todos: [] }
# redirect "/lists"
# end
# render the new list form
get "/lists/new" do
erb(:new_list, layout: :layout)
end
# returns an error msg if name is invalid, otherwise returns nil
def error_for_list_name(name)
if !(1..100).cover?(name.size)
"The list name must be between 1 and 100 characters."
elsif session[:lists].any? { |list| list[:name] == name }
"List name must be unique."
end
end
# returns an error msg if name is invalid, otherwise returns nil
def error_for_todo(name)
if !(1..100).cover?(name.size)
"The todo name must be between 1 and 100 characters."
end
end
##############
def next_list_id(session)
# session[:lists] = {}
# session[:lists] = {{id: 0, name: name0, ...}, {id: 1, name: name1, ...}, {id: 2, name: name2, ...}} ...
max = session.map { |list| list[:id] }.max || 0
max + 1
end
# create a new list
post "/lists" do
list_name = params[:list_name].strip
error = error_for_list_name(list_name)
if error
session[:error] = error
erb(:new_list, layout: :layout)
else
id = next_list_id(session[:lists])
session[:lists] << { id: id, name: list_name, todos: [] } # session[:lists] << { name: list_name, todos: [] }
session[:success] = "The list has been created."
redirect "/lists"
end
end
# def load_list(index)
# list = session[:lists][index] if index && session[:lists][index]
# return list if list
# session[:error] = "The specified list was not found."
# redirect "/lists"
# end
def load_list(id)
list = session[:lists].find { |list| list[:id] == id }
return list if list
session[:error] = "The specified list was not found."
redirect "/lists"
end
# render a list
get "/lists/:id" do
@list_id = params[:id].to_i
@list = load_list(@list_id)
erb(:list, layout: :layout)
end
# edit an existing list
get "/lists/:id/edit" do
id = params[:id].to_i
@list = load_list(id) #@list = session[:lists][id]
erb(:edit_list, layout: :layout)
end
# update an existing list
post "/lists/:id" do
list_name = params[:list_name].strip
id = params[:id].to_i
@list = load_list(id) #@list = session[:lists][id]
error = error_for_list_name(list_name)
if error
session[:error] = error
erb(:edit_list, layout: :layout)
else
@list[:name] = list_name
session[:success] = "The list has been updated."
redirect "/lists/#{id}"
end
end
# delete a list
post "/lists/:id/destroy" do
id = params[:id].to_i
session[:lists].reject! { |list| list[:id] == id } # session[:lists].delete_at(id)
if env["HTTP_X_REQUESTED_WITH"] == "XMLHttpRequest"
"/lists"
else
session[:success] = "The list has been deleted."
redirect "/lists"
end
end
def next_todo_id(todos)
max = todos.map { |todo| todo[:id] }.max || 0
max + 1
end
# add a todo item to a list
post "/lists/:list_id/todos" do
@list_id = params[:list_id].to_i
@list = load_list(@list_id) # @list = session[:lists][@list_id]
text = params[:todo].strip
error = error_for_todo(text)
if error
session[:error] = error
erb(:list, layout: :layout)
else
id = next_todo_id(@list[:todos])
@list[:todos] << { id: id, name: text, completed: false }
session[:success] = "The todo is successfully added."
redirect "/lists/#{@list_id}"
end
end
# delete a todo item
post "/lists/:list_id/todos/:id/destroy" do
@list_id = params[:list_id].to_i
@list = load_list(@list_id)
todo_id = params[:id].to_i
#@list[:todos].delete_at todo_id
@list[:todos].reject! { |todo| todo[:id] == todo_id }
if env["HTTP_X_REQUESTED_WITH"] == "XMLHttpRequest"
status 204
else
session[:success] = "The todo has been deleted."
redirect "/lists/#{@list_id}" # redirect the user back to the page they came from
end
end
# update todo status
post "/lists/:list_id/todos/:id" do
@list_id = params[:list_id].to_i
@list = load_list(@list_id) # @list = session[:lists][@list_id]
todo_id = params[:id].to_i
is_completed = params[:completed] == "true"
#@list[:todos][todo_id][:completed] = is_completed
selected_todo = @list[:todos].find { |todo| todo[:id] == todo_id } # hash returned
selected_todo[:completed] = is_completed
session[:success] = "The todo has been updated."
redirect "/lists/#{@list_id}"
end
# mark all todos as complete for a list
post "/lists/:id/complete_all" do
@list_id = params[:id].to_i
@list = load_list(@list_id) # @list = session[:lists][@list_id]
@list[:todos].each do |todo|
todo[:completed] = true
end
session[:success] = "All todos have been completed."
redirect "/lists/#{@list_id}"
end