Making model_fields optional when doing an update

[Lodimup]

class UserInUpdate(ModelSchema):
    class Config:
        model = User
        model_fields = ['first_name', 'last_name', 'email' ]

@api.put('/users/{username}')
def update_user(request, username: str, payload: UserInUpdate):
    user = get_object_or_404(User, username=username)
    for attr, value in payload.dict().items():
        setattr(user, attr, value)
    user.save()
    
    return {"success": True}

Let's say I only want to update email. How do I make it so I don't have to post other fields?
Thanks!

[stvdrsch]

Somebody that found a solution on how to do this?

[sebastian-philipp]

https://fastapi.tiangolo.com/tutorial/body-updates/#partial-updates-with-patch ?

[Lodimup]

https://django-ninja.rest-framework.com/guides/response/django-pydantic/

here, under Making fields optional

It's implemented on May 28
@vitalik vitalik
v0.22.0
9c6f136

0.22.0

[noamsto]

If you want to make it work with Schema based models, I changed a little bit @uriyyo solution from here pydantic/pydantic#3089 (reply in thread)

from typing import Any
from ninja import Schema


class User(Schema):
    first_name: str
    last_name: str
    age: int
    address: str

class OptionalSchema(Schema):
    @classmethod
    def __pydantic_init_subclass__(cls, **kwargs: Any) -> None:
        super().__pydantic_init_subclass__(**kwargs)

        for field in cls.model_fields.values():
            field.default = None

        cls.model_rebuild(force=True)
        

class PartialUser(User, OptionalSchema):
    ...