DocumentChoiceList supports grouping choices

[biozshock]

Hi!
Added possibility to make optgroups with document field type.
Basically it's symfony/symfony#2464 but adopted for ODM.

[jwage]

rebase? 👍

[stof]

@jwage a far better solution would be to use the code from the bridge as we made it more generic with @beberlei.

There is only one issue to make it fully generic but the only way to solve it efficiently is to add a method in the Common interface (looping over all properties to find the identifier is silly). The method is already implemented in the ORM but not yet part of the interface. See my comment on symfony/symfony#2942
Implementing the method in the ODM would make it possible to refactor the form integration by using only 2 classes in the bundle: a Symfony\BridgeDoctrine\Form\ChoiceList\EntityLoaderInterfaceimplementation for the MongoDB QueryBuilder and theDocumentTypeextendingDoctrineTypeto create it. There would be one BC break for the users: the option used to change the manager name when using a non-default one would beeminstead ofdocument_manager` as @beberlei has not made it configurable.

[jwage]

Lets wait then until the other blockers are resolved.

[stof]

@jwage the only blocker to do this is to implement the method in the ODM (adding it in the interface is needed to be sure that all Doctrine project have it but does not forbid to implement it in the ODM). I can provide the PR for the ODM and then the bundle if you want.

[jwage]

Sounds good.