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POnested object forms
 

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    <p>I'm a rails and ruby noob, and Im pretty sure this something completely stupid I am missing.. </p> <p>Trying to build a nested form, and have found many examples online, and tried and failed to reproduce the desired result.</p> <p>the "seller" fields are not even displayed, and when I submit form I get: </p> <blockquote> <p>unknown attribute: item</p> </blockquote> <p>models:</p> <pre><code>class Dealerform &lt; ActiveRecord::Base belongs_to :dealer has_one :seller :class_name =&gt; 'Seller' has_many :items, :through =&gt; :seller accepts_nested_attributes_for :seller, :items end class Seller &lt; ActiveRecord::Base belongs_to :dealerform has_many :items :class_name =&gt; 'Item' end class Item &lt; ActiveRecord::Base belongs_to :seller end </code></pre> <p>view:</p> <pre><code>&lt;% form_for(@dealerform) do |f| %&gt; &lt;%= f.error_messages %&gt; &lt;p&gt; &lt;%= f.label :date %&gt;&lt;br /&gt; &lt;%= f.datetime_select :date %&gt; &lt;/p&gt; #...more fields ... &lt;% f.fields_for :seller do |seller| %&gt; &lt;p&gt; &lt;%= seller.label :fname %&gt;&lt;br /&gt; &lt;%= seller.text_field :fname %&gt; &lt;/p&gt; #...more fields ... &lt;% end %&gt; &lt;% f.fields_for :item do |item| %&gt; &lt;p&gt; &lt;%= item.label :foo %&gt;&lt;br /&gt; &lt;%= item.text_field :foo %&gt; &lt;/p&gt; #...more fields ... &lt;% end %&gt; &lt;%= f.submit 'Create' %&gt; &lt;% end %&gt; </code></pre> <p>Based on suggestions.. changed the following lines:</p> <pre><code>&lt;% f.fields_for :seller do |seller| %&gt; &lt;% f.fields_for :item do |item| %&gt; </code></pre> <p>to:</p> <pre><code>&lt;% f.fields_for @seller do |seller| %&gt; &lt;% f.fields_for @item do |item| %&gt; </code></pre> <p>and now they show up in the form, and when trying to submit form I get:</p> <blockquote> <p>unknown attribute: nil_class</p> </blockquote> <p>when I change:</p> <pre><code>def new @dealerform = Dealerform.new </code></pre> <p>to:</p> <pre><code>def new @dealerform = Dealerform.new @dealerform.seller.build </code></pre> <p>I get:</p> <blockquote> <p>undefined method `build' for nil:NilClass</p> </blockquote>
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    2. COReminder — if you're working in Rails 3.0.0 or 2.3.9, be sure to upgrade now, since there is a [security vulnerability](http://weblog.rubyonrails.org/2010/10/15/security-vulnerability-in-nested-attributes-code-in-ruby-on-rails-2-3-9-and-3-0-0) for `accepts_nested_attributes_for`.
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