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POUsing Rails models with accepts_nested_attributes_for
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  1. POUsing Rails models with accepts_nested_attributes_for
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    copied!<p>I'm writing a simple Rails model called Person that <code>has_many :phone_numbers</code> and I'm trying to save the phone numbers in a complex form without manually writing setter methods. <code>accepts_nested_attributes_for</code> should do what I want but I'm having trouble getting it to work. Here's the code I have so far:</p> <p><strong>Migration</strong></p> <pre><code>class CreatePeople &lt; ActiveRecord::Migration def self.up create_table :people do |t| t.string :first_name t.string :last_name t.integer :address_id t.string :email t.timestamps end end def self.down drop_table :people end end class CreatePhoneNumbers &lt; ActiveRecord::Migration def self.up create_table :phone_numbers do |t| t.string :number, :limit =&gt; 10 t.string :extension, :limit =&gt; 5 t.string :description, :null =&gt; false t.integer :telephone_id t.string :telephone_type t.timestamps end end def self.down drop_table :phone_numbers end end </code></pre> <p><strong>Models</strong></p> <pre><code>class Person &lt; ActiveRecord::Base has_one :address, :as =&gt; :addressable, :dependent =&gt; :destroy has_many :phone_numbers, :as =&gt; :telephone, :dependent =&gt; :destroy accepts_nested_attributes_for :phone_numbers attr_protected :id validates_presence_of :first_name, :last_name, :email end class PhoneNumber &lt; ActiveRecord::Base attr_protected :id belongs_to :telephone, :polymorphic =&gt; true end </code></pre> <p><strong>View</strong></p> <pre><code>&lt;% form_for @person, :builder =&gt; CustomFormBuilder do |f| %&gt; &lt;%= f.error_messages %&gt; &lt;%= f.text_field :first_name %&gt; &lt;%= f.text_field :last_name %&gt; &lt;% fields_for "person[address]", @person.address, :builder =&gt; CustomFormBuilder do |ff| %&gt; &lt;%= ff.text_field :address_1 %&gt; &lt;%= ff.text_field :address_2 %&gt; &lt;%= ff.text_field :city %&gt; &lt;%= ff.text_field :state %&gt; &lt;%= ff.text_field :zip %&gt; &lt;% end %&gt; &lt;h2&gt;Phone Numbers&lt;/h2&gt; &lt;% @person.phone_numbers.each do |phone_number| %&gt; &lt;% fields_for "person[phone_numbers][]", phone_number, :builder =&gt; CustomFormBuilder do |ff| %&gt; &lt;%= ff.text_field :description %&gt; &lt;%= ff.text_field :number %&gt; &lt;%= ff.text_field :extension %&gt; &lt;% end %&gt; &lt;% end %&gt; &lt;%= f.text_field :email %&gt; &lt;%= f.submit 'Create' %&gt; &lt;% end %&gt; </code></pre> <p><strong>Controller</strong></p> <pre><code>def new @person = Person.new @person.build_address @person.phone_numbers.build respond_to { |format| format.html } end def create @person = Person.new(params[:person]) respond_to do |format| if @person.save flash[:notice] = "#{@person.name} was successfully created." format.html { redirect_to(@person) } else format.html { render :action =&gt; 'new' } end end end </code></pre> <p>I have verified that a phone_numbers= method is being created, but the post still causes:</p> <pre><code>PhoneNumber(#69088460) expected, got HashWithIndifferentAccess(#32603050) RAILS_ROOT: H:/projects/test_project C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations/association_proxy.rb:263:in `raise_on_type_mismatch' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations/association_collection.rb:319:in `replace' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations/association_collection.rb:319:in `each' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations/association_collection.rb:319:in `replace' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations.rb:1290:in `phone_numbers=' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:2740:in `send' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:2740:in `attributes=' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:2736:in `each' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:2736:in `attributes=' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:2434:in `initialize' H:/projects/salesguide/app/controllers/accounts_controller.rb:46:in `new' H:/projects/test_project/app/controllers/accounts_controller.rb:46:in `create' </code></pre> <p>I can get this to work by manually writing the phone_numbers= method, but this would cause a tremendous duplication of effort, I would much rather learn how to do this right. Can anybody see what I'm doing wrong?</p>
 

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