2 files changed, 16 insertions, 0 deletions
diff --git a/activerecord/test/models/aircraft.rb b/activerecord/test/models/aircraft.rb
new file mode 100644
index 0000000000..0c47aab539
--- /dev/null
+++ b/activerecord/test/models/aircraft.rb
@@ -0,0 +1,3 @@
+class Aircraft < ActiveRecord::Base
+  has_many :engines, :foreign_key => "car_id"
+end
diff --git a/activerecord/test/models/bulb.rb b/activerecord/test/models/bulb.rb
index 7d90963720..0dcc8d5970 100644
--- a/activerecord/test/models/bulb.rb
+++ b/activerecord/test/models/bulb.rb
@@ -15,4 +15,17 @@ class Bulb < ActiveRecord::Base
     self[:color] = color.upcase + "!"
   end
 
+  def self.new(attributes = {}, options = {}, &block)
+    bulb_type = (attributes || {}).delete(:bulb_type)
+
+    if options && options[:as] == :admin && bulb_type.present?
+      bulb_class = "#{bulb_type.to_s.camelize}Bulb".constantize
+      bulb_class.new(attributes, options, &block)
+    else
+      super
+    end
+  end
 end
+
+class CustomBulb < Bulb
+end
+\ No newline at end of file