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PORails forms for has_many through association with additional attributes?
 

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    <p>How can I generate form fields for a <code>has_many :through</code> association that has additional attributes?</p> <p>The <code>has_many :through</code> relationship has an additional column called <code>weight</code>.</p> <p>Here's the migration file for the join table:</p> <pre><code>create_table :users_widgets do |t| t.integer :user_id t.integer :widget_id t.integer :weight t.timestamps end </code></pre> <p>The models look like this:</p> <pre><code>User has_many :widgets, :through =&gt; :users_widgets, :class_name =&gt; 'Widget', :source =&gt; :widget has_many :users_widgets accepts_nested_attributes_for :widgets # not sure if this is necessary Widget has_many :users, :through =&gt; :users_widgets, :class_name =&gt; 'User', :source =&gt; :user has_many :users_widgets accepts_nested_attributes_for :users # not sure if this is necessary UsersWidget belongs_to :user belongs_to :widget </code></pre> <p>For the sake of simplicity, Widget and User only have one field of their own called <code>name</code>, ergo <code>User.first.name</code> and <code>Widget.first.name</code></p> <p><strong>Questions:</strong></p> <ul> <li><p>How would I append a dropdown selection for Widgets with the corresponding weight to the User create/edit form?</p></li> <li><p>How can I dynamically add additional Widget forms to Users or User forms to Widgets to easily add or remove these relationships? The <code>nested_form_for</code> gem seems to be the perfect solution but I haven't been able to get it working.</p></li> <li><p>Apart from the models and the form partials, are there any changes that need to be made to my controller?</p></li> </ul> <hr> <p>Quick note.. I'm not interested in creating new Widgets in the User form or new Users in the Widget form, I only want the ability to select from existing objects. </p> <p>I'm running Rails 3.1 and simple_form 2.0.0dev for generating my forms.</p>
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