1 files changed, 15 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/associations/builder/association.rb b/activerecord/lib/active_record/associations/builder/association.rb
index 54e51b7f44..45d3f37089 100644
--- a/activerecord/lib/active_record/associations/builder/association.rb
+++ b/activerecord/lib/active_record/associations/builder/association.rb
@@ -65,5 +65,20 @@ module ActiveRecord::Associations::Builder
           ActiveSupport::Deprecation.warn msg
         end
       end
+
+      def define_restrict_dependency_method
+        name = self.name
+        mixin.redefine_method(dependency_method_name) do
+          # has_many or has_one associations
+          if send(name).respond_to?(:exists?) ? send(name).exists? : !send(name).nil?
+            if dependent_restrict_raises?
+              raise ActiveRecord::DeleteRestrictionError.new(name)
+            else
+              errors.add(:base, :restrict_dependent_destroy, :model => name)
+              return false
+            end
+          end
+        end
+      end
    end
 end