Example-Application.textile

Here’s the code necessary to write a very simple CB app. Let’s suppose we have a database of library books, and want to write an application for viewing them.

First, we create a new Chicago Boss project. Under the Chicago Boss directory:

$ make app PROJECT=simple

This creates the directory simple on the same level as the Chicago Boss installation.

Next we define a library_book model. Under the simple directory:

model/library_book.erl:

-module(library_book, [Id, Title, AuthorName]).
-compile(export_all).

Next we define a controller for pulling records from the database. We prefix the filename of our controller with the name of our project.

controller/simple_library_book_controller.erl:

-module(simple_library_book_controller, [Req]).
-compile(export_all).

list('GET', []) ->
    LibraryBooks = boss_db:find(library_book, []),
    {ok, [{books, LibraryBooks}]}.

Finally we make a template file that puts all of the data into a pretty table.

view/library_book/list.html:

<table>
<tr><td>Title</td><td>Author</td></tr>
{% for book in books %}
<tr><td>{{ book.title }}</td>
    <td>{{ book.author_name }}</td>
</tr>
{% endfor %}
</table>

And that’s it! Visiting http://localhost:8001/library_book/list will show us all the library books in the database.