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POHow can I get an ActiveRecord::Association to initialize a parent's auto-loaded children's parent references to point at the actual parent object?
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  1. POHow can I get an ActiveRecord::Association to initialize a parent's auto-loaded children's parent references to point at the actual parent object?
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    copied!<p>This is in Ruby 1.9.3p194, with Rails 3.2.8</p> <p>app/models/owner.rb:</p> <pre><code>class Owner &lt; ActiveRecord::Base attr_accessible :name has_many :pets end </code></pre> <p>app/models/pet.rb:</p> <pre><code>class Pet &lt; ActiveRecord::Base attr_accessible :name, :owner belongs_to :owner end </code></pre> <p>db/migrate/20120829184126_create_owners_and_pets.rb:</p> <pre><code>class CreateOwners &lt; ActiveRecord::Migration def change create_table :owners do |t| t.string :name t.timestamps end create_table :pets do |t| t.string :name t.integer :owner_id t.timestamps end end end </code></pre> <p>Alright, now watch what happens...</p> <pre><code># rake db:migrate # rails console irb&gt; shaggy = Owner.create(:name =&gt; 'Shaggy') irb&gt; shaggy.pets.build(:name =&gt; 'Scooby Doo') irb&gt; shaggy.pets.build(:name =&gt; 'Scrappy Doo') irb&gt; shaggy.object_id =&gt; 70262210740820 irb&gt; shaggy.pets.map{|p| p.owner.object_id} =&gt; [70262210740820, 70262210740820] irb&gt; shaggy.name = 'Shaggie' irb&gt; shaggy.name =&gt; "Shaggie" irb&gt; shaggy.pets.map{|p| p.owner.name} =&gt; ["Shaggie", "Shaggie"] irb&gt; shaggy.save irb&gt; shaggy.reload irb&gt; shaggy.object_id =&gt; 70262210740820 irb&gt; shaggy.pets.map{|p| p.owner.object_id} =&gt; [70262211070840, 70262211079640] irb&gt; shaggy.name = "Fred" irb&gt; shaggy.name =&gt; "Fred" irb&gt; shaggy.pets.map{|p| p.ower.name} =&gt; ["Shaggie", "Shaggie"] </code></pre> <p>My question: How can I get rails to initialize the elements of shaggy.pets to have their owners set to shaggy (the exact object), not only when the pet objects are first built/created, but even when they are auto-loaded from the database via the association?</p> <p>Bonus points: Make it work in Rails 2.3.5 as well.</p>
 

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