gitlab-org--gitlab-foss/db/migrate/20161207231621_create_environment_name_unique_index.rb

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# rubocop:disable RemoveIndex
class CreateEnvironmentNameUniqueIndex < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
disable_ddl_transaction!
DOWNTIME = true
DOWNTIME_REASON = 'Making a non-unique index into a unique index'
def up
remove_index :environments, [:project_id, :name]
add_concurrent_index :environments, [:project_id, :name], unique: true
end
def down
remove_index :environments, [:project_id, :name]
add_concurrent_index :environments, [:project_id, :name], unique: true
end
end