1 files changed, 4 insertions, 0 deletions
diff --git a/railties/lib/rails/generators/generated_attribute.rb b/railties/lib/rails/generators/generated_attribute.rb
index f16bd8e082..77a3dbf9a2 100644
--- a/railties/lib/rails/generators/generated_attribute.rb
+++ b/railties/lib/rails/generators/generated_attribute.rb
@@ -159,6 +159,10 @@ module Rails
             options.delete(:required)
             options[:null] = false
           end
+
+          if reference? && !polymorphic?
+            options[:foreign_key] = true
+          end
         end
       end
     end