pydantic: Generics

https://mypy.readthedocs.io/en/stable/generics.html

https://docs.pydantic.dev/latest/usage/models/#generic-models

 

 

from typing import TypeVar, List, Generic

from pydantic import BaseModel
from pydantic.generics import GenericModel

T = TypeVar('T', bound=BaseModel, covariant=True)


class Dog(BaseModel):
    name: str
    age: int


class Paging(GenericModel, Generic[T]):
    total: int
    page: int
    size: int
    items: List[T]


dog1 = Dog(name="A", age=10)
dog2 = Dog(name="B", age=20)
dog_paging: Paging[Dog] = Paging[Dog](total=10, page=1, size=5, items=[dog1, dog2])
print(dog_paging.json())