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----
-layout: post
-title: Rails 3 has_many :through checkboxes
-tags:
-- Development
-status: publish
-type: post
-published: true
-meta:
-  _edit_last: '1'
-  _wp_old_slug: ''
----
-On Twitter I wrote:
-<blockquote>Rails does it for you, just add sheet_ids[] to the form with the checkboxes and it's done! will blog.</blockquote>
-Being a music teacher, my fiance needed to keep record of tests her students perform. Also, each test has several sheets that need mentoring and monitorization through several parameters. I decided to help and reentered the Rails world, and since I have found no answer on this topic, I decided to write it myself.
-
-This situation is a perfect model for using the so well known <a href="http://railscasts.com/episodes/17-habtm-checkboxes">HABTM checkboxes</a>.
-
-<!--more-->
-<h3>A closer look at the problem</h3>
-<h4>Models</h4>
-[gist id=663287]
-
-A pretty basic setup. The <em>venues</em> (the students' tests) include several <em>sheets</em> for them to study and for the teacher to evaluate, through <em>exhibitions</em> that have several criteria.
-<h4>View</h4>
-[gist id=663417]
-
-I simplified the form just so you see what's at stake. The same principle of the HABTM checkboxes applies to a has_many :through association. Instead of new entries in a venues_sheets table, new <em>Exhibitions</em> are created with the respective foreign ids in them.
-
-The controller needs no mention because it stays the same. It just saves / updates the model. This is why I love Rails: the hard work is done: you just need to focus on what matters.