method

prepare_update_statement

rails latest stable - Class: Arel::Visitors::MySQL

prepare_update_statement(o)

private

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.

# File activerecord/lib/arel/visitors/mysql.rb, line 76
        def prepare_update_statement(o)
          if o.offset || has_group_by_and_having?(o) ||
            has_join_sources?(o) && has_limit_or_offset_or_orders?(o)
            super
          else
            o
          end
        end

prepare_update_statement

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