How can I use inheritance in Pydantic models?

How can I use inheritance in Pydantic models?

You can create a base model and then inherit from it to create more specific models. Would you like an example?

Yes, please provide an example of base and derived models.

Sure! Here's a simple example:

from pydantic import BaseModel

class User(BaseModel):
    id: int
    name: str

class Admin(User):
    permissions: list

This way, Admin inherits all fields from User.

What if I want to add extra validation in the derived model?

You can override the __init__ method or use validators. For example:

class Admin(User):
    permissions: list

    @validator('permissions')
    def check_permissions(cls, v):
        if not v:
            raise ValueError('Permissions cannot be empty')
        return v