2a865177b9
It only makes sense for collections, and there is no collection here. Plus the docs do not say it is supported. See http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/working-with-associations.html#orphan-removal
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Doctrine 2 is an object-relational mapper (ORM) for PHP 7.0+ that provides transparent persistence for PHP objects. It sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernate's HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.