Feature Request: Completely remove certain fields in the new partial model

[HonQii]

Hello, this is a great project, thank you for sharing it, it perfectly accomplishes what I want to do. However, I have a scenario now where I have a base Model with all properties, and I want to convert it into multiple child models with only some properties using 'partial', but currently, I can only make the unnecessary properties optional. It would be perfect if I could completely remove properties in the child models.

[ddanier]

@HonQii For this requirement I would use a completely different approach. Defining some parts of the model using separate model classes and then using class inheritance (remember: in Python you can have multiple parents) to construct the full model. See this as an example:

class ModelPart1(pydantic.BaseModel):
    part1_foo: str

class ModelPart2(pydantic.BaseModel):
    part2_foo: str

class ModelPart3(pydantic.BaseModel):
    part3_foo: str

class TheFullModel(ModelPart1, ModelPart2, ModelPart3):
    pass

You may then combine this with partial models of course 😉

Like for example having all the fields from ModelPart2 optional:

class TheFullModel(
    ModelPart1,
    create_partial_model(ModelPart2),
    ModelPart3,
):
    pass

Also note: If you are using FastAPI you can remove the None values (due to fields being partial) from the response data by using response_model_exclude_none=True on the endpoint. See https://fastapi.tiangolo.com/tutorial/response-model/?h=response_model_exclude#response-model-encoding-parameters

Does this solve your issue?

[HonQii]

For this requirement I would use a completely different approach. Defining some parts of the model using separate model classes and then using class inheritance (remember: in Python you can have multiple parents) to construct the full model. See this as an example:

I'll try it. Thank you.