Dynamically populate constraints in Field.contribute_to_class

[carltongibson]

I’d quite like this to work. To generate check constraints from choices would be great.

@olivierdalang

It works exactly as I’d like when I specify an empty constraints list in my model’s Meta (meaning makemigrations will create the constraints).

But for some reason, if I don’t specify an empty list, or if my model has no Meta at all, the constraints aren’t picked up (makemigrations doesn’t create the constraints).

I’d be inclined to reduce that to a test case. Much easier to get people to comment against running code.

Q: does it work generating migrations when you change the choices? (Showing that in a test too would be handy.)