In nested_attributes when association is not loaded and association

record is saved and then in memory record attributes should be saved

[#5053 state:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

activerecord/lib/active_record/associations/association_collection.rb

@@ -477,7 +477,14 @@ module ActiveRecord
           callback(:before_add, record)
           yield(record) if block_given?
           @target ||= [] unless loaded?
-          @target << record unless @reflection.options[:uniq] && @target.include?(record)
+          index = @target.index(record)
+          unless @reflection.options[:uniq] && index
+            if index
+              @target[index] = record
+            else
+             @target << record
+            end
+          end
           callback(:after_add, record)
           set_inverse_instance(record, @owner)
           record

activerecord/test/cases/nested_attributes_test.rb

@@ -856,6 +856,12 @@ class TestHasManyAutosaveAssociationWhichItselfHasAutosaveAssociations < ActiveR
     @part = @ship.parts.create!(:name => "Mast")
     @trinket = @part.trinkets.create!(:name => "Necklace")
   end
+
+  test "if association is not loaded and association record is saved and then in memory record attributes should be saved" do
+    @ship.parts_attributes=[{:id => @part.id,:name =>'Deck'}]
+    assert_equal 1, @ship.parts.proxy_target.size
+    assert_equal 'Deck', @ship.parts[0].name
+  end
   
   test "when grandchild changed in memory, saving parent should save grandchild" do
     @trinket.name = "changed"