Rollback changes made to CreateProjectMirrorData

db/migrate/20180502122856_create_project_mirror_data.rb

@@ -4,11 +4,8 @@ class CreateProjectMirrorData < ActiveRecord::Migration
   DOWNTIME = false
 
   def up
-    if table_exists?(:project_mirror_data)
-      add_column :project_mirror_data, :status, :string unless column_exists?(:project_mirror_data, :status)
-      add_column :project_mirror_data, :jid, :string unless column_exists?(:project_mirror_data, :jid)
-      add_column :project_mirror_data, :last_error, :text unless column_exists?(:project_mirror_data, :last_error)
-    else
+    return if table_exists?(:project_mirror_data)
+
     create_table :project_mirror_data do |t|
       t.references :project, index: true, foreign_key: { on_delete: :cascade }
       t.string :status
@@ -16,7 +13,6 @@ class CreateProjectMirrorData < ActiveRecord::Migration
       t.text :last_error
     end
   end
-  end
 
   def down
     drop_table(:project_mirror_data) if table_exists?(:project_mirror_data)