[DDC-2250] Joining Associations in Single Inheritance Scheme

Sun, 20 Jan 2013 13:25:40 +0000

Let's assume the following class hierarchy:

AbstractComment
SpecialComment extends AbstractComment
{
    private $specialAssociation;
}
RegularComment extends RegularComment

Now, I'd like to write a query such as:

SELECT c, a FROM AbstractComment c LEFT JOIN c.specialAssociation a

The idea is to preload the association when selecting all comments. Now, that association is only present on a sub-class of the queried class, but since it is a single table inheritance, Doctrine should be able to join it for those entities where it is present.

At the moment unfortunately, Doctrine shows an error that the association does not exist on the AbstractComment class. Also, there is no real alternative to this except moving the collection to the base class even if it does not belong there.

Doctrine Project

[DDC-2250] Joining Associations in Single Inheritance Scheme