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PO:autosave ignored on has_many relation -- what am I missing?
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copied!<p>I have a pair of classes:</p> <pre><code>class Collection < ActiveRecord::Base has_many :items, autosave: true end class Item < ActiveRecord::Base belongs_to :collection end </code></pre> <p>From the <a href="http://api.rubyonrails.org/classes/ActiveRecord/AutosaveAssociation.html">docs</a>:</p> <blockquote> <p>When :autosave is true all children is saved, no matter whether they are new records:</p> </blockquote> <p>But when I update an <code>Item</code> and save its parent <code>Collection</code>, the <code>Item</code>'s upated attributes don't get saved:</p> <pre><code> > c = Collection.first => #<Collection id: 1, name: "collection", created_at: "2012-07-23 00:00:10", updated_at: "2012-07-23 00:00:10"> > i = c.items.first => #<Item id: 1, collection_id: 1, name: "item1", created_at: "2012-07-23 00:00:25", updated_at: "2012-07-23 00:00:25"> > i.name = 'new name' => "new name" > c.save => true > Collection.first.items => [#<Item id: 1, collection_id: 1, name: "item1", created_at: "2012-07-23 00:00:25", updated_at: "2012-07-23 00:00:25">] </code></pre> <p>So, what am I missing?</p> <p>I'm using Rails 3.2.5 and Ruby 1.9.2.</p> <hr> <p>So I've done some digging about in the source of ActiveRecord. We can get hold of <code>c</code>'s autosave assocations:</p> <pre><code> > c.class.reflect_on_all_autosave_associations => [#<ActiveRecord::Reflection::AssociationReflection:0x007fece57b3bd8 @macro=:has_many, @name=:items, @options={:autosave=>true, :extend=>[]}, @active_record=Collection(id: integer, name: string, created_at: datetime, updated_at: datetime), @plural_name="items", @collection=true, @class_name="Item", @klass=Item(id: integer, collection_id: integer, name: string, created_at: datetime, updated_at: datetime), @foreign_key="collection_id", @active_record_primary_key="id", @type=nil>] </code></pre> <p>I think this illustrates that the association has been set up for autosaving.</p> <p>We can then get the instance of the association corresponding to <code>c</code>:</p> <pre><code> > a = c.send :association_instance_get, :items => #<ActiveRecord::Associations::HasManyAssociation:0x007fece738e920 @target=[#<Item id: 1, collection_id: 1, name: "item1", created_at: "2012-07-23 00:00:25", updated_at: "2012-07-23 00:00:25">], @reflection=#<ActiveRecord::Reflection::AssociationReflection:0x007fece57b3bd8 @macro=:has_many, @name=:items, @options={:autosave=>true, :extend=>[]}, @active_record=Collection(id: integer, name: string, created_at: datetime, updated_at: datetime), @plural_name="items", @collection=true, @class_name="Item", @klass=Item(id: integer, collection_id: integer, name: string, created_at: datetime, updated_at: datetime), @foreign_key="collection_id", @active_record_primary_key="id", @type=nil>, @owner=#<Collection id: 1, name: "collection", created_at: "2012-07-23 00:00:10", updated_at: "2012-07-23 00:00:10">, @updated=false, @loaded=true, @association_scope=[#<Item id: 1, collection_id: 1, name: "item1", created_at: "2012-07-23 00:00:25", updated_at: "2012-07-23 00:00:25">], @proxy=[#<Item id: 1, collection_id: 1, name: "item1", created_at: "2012-07-23 00:00:25", updated_at: "2012-07-23 00:00:25">], @stale_state=nil> </code></pre> <p>We can then find the actual objects that are associated via this association:</p> <pre><code> > a.target => [#<Item id: 1, collection_id: 1, name: "item1", created_at: "2012-07-23 00:00:25", updated_at: "2012-07-23 00:00:25">] </code></pre> <p>The object found here does not have update that I'd made earlier.</p>

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