destroy_row

# File activerecord/lib/active_record/locking/optimistic.rb, line 120
        def destroy_row
          return super unless locking_enabled?

          locking_column = self.class.locking_column

          delete_constraints = _primary_key_constraints_hash
          delete_constraints[locking_column] = _lock_value_for_database(locking_column)

          affected_rows = self.class._delete_record(delete_constraints)

          if affected_rows != 1
            raise ActiveRecord::StaleObjectError.new(self, "destroy")
          end

          affected_rows
        end