Add CRUD form option for to-one associations

[michaelKaefer]

Without this PR the association field renders a a dropdown and you cannot edit the associated entity but just select an already existing entity. If you want to edit an associated entity you cannot use AssociationField and so you have to create a custom EA field. Creating a custom EA field doesn't allow using EA fields and could sometimes kind of duplicate the CRUD form of the associated entity. This PR would enable you to use the CRUD form for AssociationField if it is a to-one association (for to-many associations CollectionField can be used).

I createad a reproducer: https://github.com/michaelKaefer/ea-reproducer/tree/association-field-use-crud-form.

Similar to https://github.com/EasyCorp/EasyAdminBundle/pull/5210.

[michaelKaefer]

@devzenfr Thank you for finding and fixing this errors! I think the PR is finished now.

[devzenfr]

@devzenfr Thank you for finding and fixing this errors! I think the PR is finished now.

Can confirm that it looks great. I'm now using a fork including your PR and everything is working smoothly. Nice job 🙏

[ahmedyakoubi]

hey @michaelKaefer , thank you for your work . is this PR going to be merged soon ?

[michaelKaefer]

Hi @ahmedyakoubi , no sorry, I don't know if and when it gets merged.

[javiereguiluz]

I apologize to @michaelKaefer for not having merged this on time. I'm going to try to merge it soon.

[ahmedyakoubi]

thank you @javiereguiluz and @michaelKaefer .

[javiereguiluz]

This is finally merged 🙏

Michael, thanks a lot for this contribution. Your code was very easy to follow and implemented the feature in a nice and concise way. I also thank you for the reproducer (https://github.com/michaelKaefer/ea-reproducer/tree/association-field-use-crud-form) because it allowed me to play with the feature very easily.

While merging I did some tweaks. First, I reworded the docs a bit because I had some troubles while trying to fully understand the purpose of the feature. If I did some mistakes, we can fix it in a follow-up PR.

Second, I renamed the option to renderAsEmbeddedForm() (instead of the original useCrudForm()). As any naming, everything is debatable, but I felt that the original name was a bit generic and the new one is a bit more clear, although is longer. As always, if folks think that the new name is worse, we can revert the change.

Here are the tweaks: https://github.com/EasyCorp/EasyAdminBundle/commit/ae79fa8912c6ad4941f26efd1f7603ec97c5db79

[michaelKaefer]

Thank you, the docs are a lot better now, good to understand!