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POrails fields_for and nested attributes
 

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    <p>I have difficulty to understand how to use fields_for and nested attributes. In order to understand it better, I created a <a href="https://github.com/nyror/nested_attributes" rel="nofollow noreferrer">repo</a>, which is not working. </p> <p>I read <a href="https://stackoverflow.com/questions/4480187/fields-for-for-nested-attribute-returns-nothing">this</a>, which is not helpful. </p> <p>I am using:</p> <p>Rails 4.0.1 Ruby 2.0.0-p247</p> <h3>Question:</h3> <ol> <li>address form shown, why can not save to database?</li> <li><p>Why not work?</p> <p><code>jack = Person.create(name: 'Jack')</code></p> <p><code>jack.address.create(street: '12w 33st')</code></p></li> </ol> <p>The main function is as below:</p> <pre><code>#model class Person &lt; ActiveRecord::Base has_one :address accepts_nested_attributes_for :address end class Address &lt; ActiveRecord::Base belongs_to :person end </code></pre> <p>view as below:</p> <pre><code>&lt;%= form_for(@person) do |f| %&gt; &lt;% if @person.errors.any? %&gt; &lt;div id="error_explanation"&gt; &lt;h2&gt;&lt;%= pluralize(@person.errors.count, "error") %&gt; prohibited this person from being saved:&lt;/h2&gt; &lt;ul&gt; &lt;% @person.errors.full_messages.each do |msg| %&gt; &lt;li&gt;&lt;%= msg %&gt;&lt;/li&gt; &lt;% end %&gt; &lt;/ul&gt; &lt;/div&gt; &lt;% end %&gt; &lt;div class="field"&gt; &lt;%= f.label :name %&gt;&lt;br&gt; &lt;%= f.text_field :name %&gt; &lt;/div&gt; &lt;div class="field"&gt; &lt;%= f.label :age %&gt;&lt;br&gt; &lt;%= f.text_field :age %&gt; &lt;/div&gt; &lt;div class="field"&gt; &lt;%= f.label :gender %&gt;&lt;br&gt; &lt;%= f.text_field :gender %&gt; &lt;/div&gt; &lt;%= fields_for :address do |address_fields|%&gt; Street: &lt;%= address_fields.text_field :street%&gt; Zip code: &lt;%= address_fields.text_field :zip_code%&gt; &lt;% end %&gt; &lt;div class="actions"&gt; &lt;%= f.submit %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p><a href="http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-fields_for" rel="nofollow noreferrer">nested attributes</a></p> <h3>Conclusion:</h3> <ol> <li>has_one relation does not support <code>person.address.create</code>. That's only for has_many</li> <li>rails api for <code>fields_for</code>, is really not clear. It's just missing the whole controller part. Follow it will not make it.</li> </ol>
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