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Pydantic

Python data serialization tips

update_forward_refs

from __future__ import annotations
from typing import List
from pydantic import BaseModel
class UserAlone(BaseModel):
id: int = None
name: str
class Config:
orm_mode = True
class User(UserAlone):
roles: List['RoleAlone']= []
class RoleAlone(BaseModel):
id: int = None
name: str
class Config:
orm_mode = True
User.update_forward_refs()
class Role(RoleAlone):
users: List[UserAlone]