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POHow to create nested objects using accepts_nested_attributes_for
 

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  1. POHow to create nested objects using accepts_nested_attributes_for
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    <p>I've upgraded to Rails 2.3.3 (from 2.1.x) and I'm trying to figure out the <code>accepts_nested_attributes_for</code> method. I can use the method to update existing nested objects, but I can't use it to create new nested objects. Given the contrived example:</p> <pre><code>class Product &lt; ActiveRecord::Base has_many :notes accepts_nested_attributes_for :notes end class Note &lt; ActiveRecord::Base belongs_to :product validates_presence_of :product_id, :body end </code></pre> <p>If I try to create a new <code>Product</code>, with a nested <code>Note</code>, as follows:</p> <pre><code>params = {:name =&gt; 'Test', :notes_attributes =&gt; {'0' =&gt; {'body' =&gt; 'Body'}}} p = Product.new(params) p.save! </code></pre> <p>It fails validations with the message:</p> <pre><code>ActiveRecord::RecordInvalid: Validation failed: Notes product can't be blank </code></pre> <p>I understand why this is happening -- it's because of the <code>validates_presence_of :product_id</code> on the <code>Note</code> class, and because at the time of saving the new record, the <code>Product</code> object doesn't have an <code>id</code>. However, I don't want to remove this validation; I think it would be incorrect to remove it.</p> <p>I could also solve the problem by manually creating the <code>Product</code> first, and then adding the <code>Note</code>, but that defeats the simplicity of <code>accepts_nested_attributes_for</code>.</p> <p>Is there a standard Rails way of creating nested objects on new records?</p>
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