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@@ -1105,6 +1105,10 @@ module ActiveRecord
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               association = association_proxy_class.new(self, reflection)
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             end
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+            # if a Hash is passed in, convert it to an ActiveRecord model
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+            # using the Hash as the initialization attributes
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+            new_value = reflection.klass.new(new_value) if new_value.is_a?(Hash)
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+
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             if association_proxy_class == HasOneThroughAssociation
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               association.create_through_record(new_value)
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               self.send(reflection.name, new_value)

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@@ -94,6 +94,11 @@ module ActiveRecord
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         @owner.transaction do
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           flatten_deeper(records).each do |record|
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+
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+            # if a Hash is passed in, convert it to an ActiveRecord model
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+            # using the Hash as the initialization attributes
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+            record = @reflection.klass.new(record) if record.is_a?(Hash)
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+
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             raise_on_type_mismatch(record)
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             add_record_to_target_with_callbacks(record) do |r|
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               result &&= insert_record(record) unless @owner.new_record?

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@@ -189,6 +189,24 @@ class AssociationProxyTest < ActiveRecord::TestCase
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     end
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   end
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+  def test_association_proxy_setter_can_take_hash
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+    special_comment_attributes = { :body => 'Setter Takes Hash' }
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+
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+    post = posts(:welcome)
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+    post.very_special_comment = { :body => 'Setter Takes Hash' }
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+
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+    assert_equal post.very_special_comment.body, special_comment_attributes[:body]
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+  end
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+
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+  def test_association_collection_can_take_hash
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+    post_attributes = { :title => 'Setter Takes', :body => 'Hash' }
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+
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+    david = authors(:david)
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+    post = (david.posts << post_attributes).last
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+
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+    assert_equal post.title, post_attributes[:title]
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+  end
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+
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   def setup_dangling_association
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     josh = Author.create(:name => "Josh")
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     p = Post.create(:title => "New on Edge", :body => "More cool stuff!", :author => josh)