1 files changed, 8 insertions, 4 deletions
diff --git a/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb b/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
index f3391eba13..30fc44b4c2 100644
--- a/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
+++ b/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
@@ -15,10 +15,14 @@ module ActiveRecord::Associations::Builder
 
       def define_destroy_hook
         name = self.name
-        mixin.send(:define_method, :destroy_associations) do
-          association(name).delete_all
-          super()
-        end
+        model.send(:include, Module.new {
+          class_eval <<-RUBY, __FILE__, __LINE__ + 1
+            def destroy_associations
+              association(#{name.to_sym.inspect}).delete_all
+              super
+            end
+          RUBY
+        })
       end
 
       # TODO: These checks should probably be moved into the Reflection, and we should not be