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POaccepts_nested_attributes_for to link to existing record, not create a new one
 

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    <p>I have the following models</p> <pre><code>class Order &lt; AR::Base has_many :products accepts_nested_attributes_for :products end class Product &lt; AR::Base belongs_to :order has_and_belongs_to_many :stores accepts_nested_attributes_for :stores end class Store &lt; AR::Base has_and_belongs_to_many :products end </code></pre> <p>Now I have a order view where I want to update the shops for the product. The thing is that I only want to connect the products to the existing shops in my db, not create new ones.</p> <p>My form in the order view looks like this (using Formtastic):</p> <pre><code>= semantic_form_for @order do |f| = f.inputs :for =&gt; :live_products do |live_products_form| = live_products_form.inputs :for =&gt; :stores do |stores_form| = stores_form.input :name, :as =&gt; :select, :collection =&gt; Store.all.map(&amp;:name) </code></pre> <p>Although its nested it works fine. The problem is that, when I select a store and try to update the order (and the products and stores with it), Rails tries to create a new store with that name. I want it to just use the existing store and connect the product to that.</p> <p>Any help appreciated!</p> <p>EDIT 1:</p> <p>In the end I solved this problem in a very crude way:</p> <pre><code># ProductsController def update [...] # Filter out stores stores_attributes = params[:product].delete(:stores_attributes) @product.attributes = params[:product] if stores_attributes.present? # Set stores @product.stores = stores_attributes.map do |store_attributes| # This will raise RecordNotFound exception if a store with that name doesn't exist Store.find_by_name!(store_attributes[:name]) end end @order.save [...] end </code></pre> <p>EDIT 2:</p> <p>Pablo's solution is much more elegant and should be preferred over mine.</p>
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    1. USManuel Meurer
    1. USManuel Meurer
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      1. USGabe Kopley
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    1. COAfter reviewing the docs for a_n_a_f (http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html) I first got excited when I saw the update_only option but quickly realized there is no way to do what I want to do (update_only updates the existing objects before creating new ones).
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