method
join_to_update
v4.2.9 -
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Class: ActiveRecord::ConnectionAdapters::DatabaseStatements
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- What's this?
join_to_update(update, select)
public
The default strategy for an UPDATE with joins is to use a subquery. This doesn’t work on MySQL (even when aliasing the tables), but MySQL allows using JOIN directly in an UPDATE statement, so in the MySQL adapters we redefine this to do that.