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update_with_lock

Importance_0
Ruby on Rails latest stable (v4.0.2) - 0 notes - Class: ActiveRecord::Locking::Optimistic

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v2.3.8) is shown here.

update_with_lock(attribute_names = @attributes.keys) private

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# File activerecord/lib/active_record/locking/optimistic.rb, line 80
        def update_with_lock(attribute_names = @attributes.keys) #:nodoc:
          return update_without_lock(attribute_names) unless locking_enabled?
          return 0 if attribute_names.empty?

          lock_col = self.class.locking_column
          previous_value = send(lock_col).to_i
          send(lock_col + '=', previous_value + 1)

          attribute_names += [lock_col]
          attribute_names.uniq!

          begin
            affected_rows = connection.update("UPDATE \#{self.class.quoted_table_name}\nSET \#{quoted_comma_pair_list(connection, attributes_with_quotes(false, false, attribute_names))}\nWHERE \#{self.class.primary_key} = \#{quote_value(id)}\nAND \#{self.class.quoted_locking_column} = \#{quote_value(previous_value)}\n", "#{self.class.name} Update with optimistic locking")

            unless affected_rows == 1
              raise ActiveRecord::StaleObjectError, "Attempted to update a stale object: #{self.class.name}"
            end

            affected_rows

          # If something went wrong, revert the version.
          rescue Exception
            send(lock_col + '=', previous_value)
            raise
          end
        end
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