Ruby - 基于布尔变量实例化数组值

My user model has seven boolean columns (:mon, :tue... :sat, :sun) for each day of the week. In one of the user methods I need to create an array of strings like ["mon", "tue"... "sat", "sun"] for use in time parsing. As you can guess, these array values come from the database columns, and should only be in the array if that column is true.My user model has seven boolean columns (:mon,