Support nested model created with create_pydantic_model

[dantownsend]

As suggested here:

piccolo-orm/piccolo#202

It would be great if create_pydantic_model could generate nested models.

create_pydantic_model(Band, nested_models=[Band.manager])

This would output something equivalent to this:

from pydantic import BaseModel

class ManagerModel:
    name: str    

class BandModel:
    name: str
    manager: ManagerModel

[aminalaee]

@dantownsend This is cool, I just have a question, should create_pydantic_model now return a list of models? In case of nested models returning two?

[dantownsend]

@aminalaee Yeah, it's a good point. I think it would just return a single model still. The child models would just be created internally by create_pydantic_model.

It's a bit ugly, but you could still access the sub models if you wanted them.

class Manager(Table):
    name = Varchar()

class Band(Table):
    name = Varchar()
    manager = ForeignKey(Manager)

BandModel = create_pydantic_model(Band, nested=True)
BandModel.__fields__['manager'].type_
>>> ManagerModel

What do you think?

[aminalaee]

@dantownsend I have to say I like BandModel = create_pydantic_model(Band, nested=True) better than previous ones.
Let me try it out.

[dantownsend]

@aminalaee Great, thanks