1 files changed, 5 insertions, 1 deletions
diff --git a/db/migrate/20161209153400_add_unique_index_for_environment_slug.rb b/db/migrate/20161209153400_add_unique_index_for_environment_slug.rb
index e9fcef1cd45..d7ef1aa83d9 100644
--- a/db/migrate/20161209153400_add_unique_index_for_environment_slug.rb
+++ b/db/migrate/20161209153400_add_unique_index_for_environment_slug.rb
@@ -9,7 +9,11 @@ class AddUniqueIndexForEnvironmentSlug < ActiveRecord::Migration
 
   disable_ddl_transaction!
 
-  def change
+  def up
     add_concurrent_index :environments, [:project_id, :slug], unique: true
   end
+
+  def down
+    remove_index :environments, [:project_id, :slug], unique: true if index_exists? :environments, [:project_id, :slug]
+  end
 end