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    copied!<p>An even DRYer solution:</p> <p>1) in your Gemfile, list <code>nested_form</code> as a dependency.</p> <p>2) in your models do this:</p> <pre><code>class Account &lt; ActiveRecord::Base accepts_nested_attributes_for :organizations end class Organization &lt; ActiveRecord::Base accepts_nested_attributes_for :locations end </code></pre> <p>3) create regular forms for Organization under <code>./app/view/organizations/ and for Location under</code>./app/view/locations/`</p> <p>4) in your Account form, do this: (it gets pretty short this way!)</p> <pre><code>&lt;%= nested_form_for @account do |f| %&gt; &lt;%= f.label :account_type %&gt;&lt;br /&gt; &lt;%= f.text_field :account_type %&gt;&lt;br /&gt; &lt;%= f.fields_for :organizations %&gt; &lt;%= f.submit "Add account" %&gt; &lt;% end %&gt; </code></pre> <p>5) in your Organization form, do this: (also pretty short)</p> <pre><code>&lt;%= nested_form_for @organization do |f| %&gt; &lt;%= f.label :name %&gt;&lt;br /&gt; &lt;%= f.text_field :name %&gt;&lt;br /&gt; &lt;%= f.label :website %&gt;&lt;br /&gt; &lt;%= f.text_field :website %&gt;&lt;br /&gt; &lt;%= f.fields_for :locations %&gt; &lt;%= f.submit "Add Organization" %&gt; &lt;% end %&gt; </code></pre> <p>Check these RailsCasts:</p> <p><a href="http://railscasts.com/episodes/196-nested-model-form-part-1" rel="nofollow">http://railscasts.com/episodes/196-nested-model-form-part-1</a></p> <p><a href="http://railscasts.com/episodes/197-nested-model-form-part-2" rel="nofollow">http://railscasts.com/episodes/197-nested-model-form-part-2</a></p>
 

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