Mongo support

Mongo database by default uses primary identifiers named _id.

I am trying to use with Mongo and still not checked all the use cases yet but already have something to implement. Inference elements form values do not expect _id field (only id).

Please take a look at this. Simple test in previous commit.

I will add something else when it will be required in next use case. Give me some feedback.

[dylanh724]

I’d have to agree with the others regarding _id, since mongodb standard is _id (and most all other apps use _id). When would anyone actually use id instead of _id outside a simple json file? Even then, the average person would still use _id in almost all cases involving json if you’re even considering using a proper db.

Feels strange to, by default, use the opposite of what is standard? It’s not like the docs/tutorial uses SQL. As long as the docs/tutorial focuses on json (which leans to Mongo), this should be changed to _id or it’s wildly unexpected.

[fzaninotto]

That’s already documented in the FAQ: https://marmelab.com/react-admin/FAQ.html#can-i-have-custom-identifiersprimary-keys-for-my-resources