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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class AddUniqueIndexForEnvironmentSlug < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = true
DOWNTIME_REASON = 'Adding a *unique* index to environments.slug'
disable_ddl_transaction!
def up
add_concurrent_index :environments, [:project_id, :slug], unique: true
end
def down
remove_index :environments, [:project_id, :slug] if index_exists? :environments, [:project_id, :slug]
end
end
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