method

join_to_update

Ruby on Rails latest stable (v6.1.7.7) - 0 notes - Class: ActiveRecord::ConnectionAdapters

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What's this?

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v5.2.3) is shown here.

join_to_update(update, select, key) public

In the simple case, MySQL allows us to place JOINs directly into the UPDATE query. However, this does not allow for LIMIT, OFFSET and ORDER. To support these, we must use a subquery.

Show source

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 219
      def join_to_update(update, select, key) # :nodoc:
        if select.limit || select.offset || select.orders.any?
          super
        else
          update.table select.source
          update.wheres = select.constraints
        end
      end

join_to_update

Related methods

Method deprecated or moved

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