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PORails Find based on a set existing in through a relation
 

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  1. PORails Find based on a set existing in through a relation
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    <p>I am trying to select an instance based on a relation of that instance containing a set. A simplified example follows:</p> <pre><code>class Product::Variation &lt; ActiveRecord::Base attr_accessible :name, :product_id, :quantity belongs_to :product has_many :bids, :foreign_key =&gt; :product_variation_id has_many :product_variation_property_values, :class_name =&gt; 'Product::Variation::PropertyValue' has_many :property_values, :through =&gt; :product_variation_property_values, :class_name =&gt; 'Property::Value' end class Product::Variation::PropertyValue &lt; ActiveRecord::Base attr_accessible :property_value_id, :variation_id, :property_id belongs_to :variation belongs_to :property_value, :class_name =&gt; 'Property::Value' end class Property &lt; ActiveRecord::Base attr_accessible :name has_many :values, :class_name =&gt; 'Property::Value' end class Property::Value &lt; ActiveRecord::Base attr_accessible :content belongs_to :property belongs_to :partner end </code></pre> <p>So now I want to do something like the following (in psuedo code):</p> <pre><code>Variation.where(:property_values includes [Property::Value.find(1), Property::Value.find(2)]) </code></pre> <p>Is there a way to do this using ActiveRecord?</p> <p>Thanks and let me know if you need more info.</p> <p><em><strong>More Info</em></strong></p> <p>I tried the following:</p> <pre><code>Product::Variation.joins(:property_values).where('property_values.id' =&gt; [Property::Value.find(1).id, Property::Value.find(2).id]).first </code></pre> <p>...which is the following SQL...</p> <pre><code>SELECT "product_variations".* FROM "product_variations" INNER JOIN "product_variation_property_values" ON "product_variation_property_values"."variation_id" = "product_variations"."id" INNER JOIN "property_values" ON "property_values"."id" = "product_variation_property_values"."property_value_id" WHERE "property_values"."id" IN (1, 2) </code></pre> <p>...and this returns...</p> <pre><code>#&lt;Product::Variation id: 25, product_id: 1, quantity: 39, created_at: "2013-11-18 00:18:45", updated_at: "2013-11-18 00:18:45"&gt; </code></pre> <p>But if I do:</p> <pre><code>Product::Variation.find(25).property_values.inspect </code></pre> <p>...I get...</p> <pre><code>[#&lt;Property::Value id: 1, property_id: 1, content: "XS", created_at: "2013-11-18 00:18:45", updated_at: "2013-11-18 00:18:45", color: nil, color_texture: nil, secondary_color: nil&gt;, #&lt;Property::Value id: 6, property_id: 2, content: "Dark Wood", created_at: "2013-11-18 00:18:45", updated_at: "2013-11-18 00:18:45", color: "#855E42", color_texture: "striped", secondary_color: "#FFB90F"&gt;] </code></pre> <p>But I'm looking for the <code>Product::Variation</code> that contains both <code>Property::Value</code> 1 and 2. This is returning those that contain 1 or 2.</p>
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