ODM composite key support

[stephpy]

Look at #96

Hi, i saw there is an issue on TimelineBundle ODM with new versions of doctrine mongo ODM Bundle since they change behavior of hash field type.

First behavior was like ORM. You set a STRING identifer (ABCD), it'll store a serialization of that. You set an ARRAY identifier (for composite keys), it'll serialize it too.

Setting this as string is great but you'll have to make some changes to supports composite keys.

[vkartaviy]

Doctrine MongoDB ODM doesn't have composite primary keys, or am I wrong?

[stephpy]

Yes, but you could refer to an other stored entities:

Storing TimelineBundle with driver ODM but having user via ORM with composite keys. If you cannot store an array of keys on Component table, on mongo you'll not be able to identify User.

Components can be stocked in any type of storage.

[vkartaviy]

I got your point. I totally forget about storage combinations...

[stephpy]

We should repeat the behavior for hash field type in ORM. It's a string field type which is serialized/unserialized.
It could be added on Document/Component.php identifier setter/getter.