Inheritance on doctrine's embeddables

Question

Is it possible to use inheritance on value objects embedded in doctrine entities?

The situation I'm thinking about is:

I have an entity that has and embedded value object. That value object has the following hierarchy:

class myEntity {
    /** @Embedded(class = "baseValueObject") */
    private $value_object;
    ...
}

class baseValueObject {...}
class valueObject1 extends baseValueObject{...}
class valueObject2 extends baseValueObject2{...}

If I define my entity to have baseValueObject as an embeddable, nothing happens when I use the schema-tool to update my db schema, so I guess that's not the way to do it.

Another option that I'm thinking about is to use single-table inheritance on the entity to create a child entity that use one of the value objects, and another child entity for the other one. Like this:

class myEntity {
    /** @Embedded(class = "baseValueObject") */
    private $value_object;
    ...
}

class myEntityA extends myEntity {
    /** @Embedded(class = "valueObject1") */
    private $value_object;
    ...
}

class myEntityB extends myEntity {
    /** @Embedded(class = "valueObject2") */
    private $value_object;
    ...
}

class baseValueObject {...}
class valueObject1 extends baseValueObject{...}
class valueObject2 extends baseValueObject2{...}

What's the proper approach? Is it even possible to do it this way?

Answer 1

If you want to extend one embeddable from another you need to set the parents properties as protected not private.

https://github.com/doctrine/doctrine2/issues/4097