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PORails 3 Nested Model Form: Can not mass assign protected attribute
 

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  1. PORails 3 Nested Model Form: Can not mass assign protected attribute
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    <p>I currently have a form set up with nested models - all going according to plan so far. The form allows me to create a sale, and from that I can create a customer and a vehicle (separate models). </p> <p>The problem comes when I try to create a registration number, which is a separate model nested from vehicle; essentially I can get a text box to appear on the form, but trying to create a registration number results in a <code>can not mass assign protected attribute :registration_number</code> error in the console, and when editing a sale that includes a vehicle with a registration number, the text box is empty. </p> <p>The models involved are:</p> <pre><code>class Sale &lt; ActiveRecord::Base attr_accessible :customer_id, :vehicle_id, :sale_date, :customer_attributes, :vehicle_attributes belongs_to :customer accepts_nested_attributes_for :customer belongs_to :vehicle accepts_nested_attributes_for :vehicle end </code></pre> <p>and</p> <pre><code>class Vehicle &lt; ActiveRecord::Base attr_accessible :first_registration_date, :hidden, :registration_numbers_attributes has_many :sales has_many :customers, :through =&gt; :sales has_many :vehicle_registration_numbers, :dependent =&gt; :delete_all has_many :registration_numbers, :through =&gt; :vehicle_registration_numbers accepts_nested_attributes_for :registration_numbers, :allow_destroy =&gt; true end </code></pre> <p>and</p> <pre><code>class RegistrationNumber &lt; ActiveRecord::Base attr_accessible :number has_many :vehicle_registration_numbers, :dependent =&gt; :delete_all has_many :vehicles, :through =&gt; :vehicle_registration_numbers end </code></pre> <p>and</p> <pre><code>class VehicleRegistrationNumber &lt; ActiveRecord::Base belongs_to :vehicle belongs_to :registration_number end </code></pre> <p>The form in question is:</p> <pre><code>&lt;%= form_for @sale, :html =&gt; {:class =&gt; 'fullform'} do |f| %&gt; &lt;%= field_set_tag 'Customer Details' do %&gt; &lt;%= f.fields_for :customer do |builder| %&gt; &lt;snip&gt; &lt;% end %&gt; &lt;% end %&gt; &lt;%= field_set_tag 'Vehicle Details' do %&gt; &lt;%= f.fields_for :vehicle do |vehicle_builder| %&gt; &lt;snip&gt; &lt;%= f.fields_for :registration_numbers do |registration_number_builder| %&gt; &lt;%= registration_number_builder.text_field :number, :class =&gt; 'formtxtbox-short' %&gt; &lt;% end %&gt; &lt;% end %&gt; &lt;% end %&gt; &lt;% end %&gt; </code></pre> <p>Any assistance would be greatly appreciated - thanks!</p>
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