Doctrine DQL, class table inheritance and access to subclass fields

Question

I have a problem with a DQL query and entity specialization.

I have an Entity called Auction, which is OneToOne relation with Item

Answer 1

The Doctrine team has stated that they're not going to add support for this:

https://github.com/doctrine/orm/issues/2237

Pertinent comments from that page:

Thats indeed tricky. That syntax alone can, however, never work, because there might be several subclasses that have a field named "d", so Doctrine would not know which field you mean.

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I am closing this one.

The requirement of this issue is basically violating OO principles.

If you really need to filter across multiple child-entities in your inheritance, then try something as following instead:

SELECT r FROM Root r WHERE r.id IN ( SELECT c.id FROM Child c WHERE c.field = :value )