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Problem with relationship in SQLmodel and fastapi #382
Description
First Check
- I added a very descriptive title to this issue.
- I used the GitHub search to find a similar issue and didn't find it.
- I searched the SQLModel documentation, with the integrated search.
- I already searched in Google "How to X in SQLModel" and didn't find any information.
- I already read and followed all the tutorial in the docs and didn't find an answer.
- I already checked if it is not related to SQLModel but to Pydantic.
- I already checked if it is not related to SQLModel but to SQLAlchemy.
Commit to Help
- I commit to help with one of those options 👆
Example Code
from typing import Optional, List, TYPE_CHECKING
from sqlmodel import SQLModel, Field, Relationship
from app.models.formation_user import FormationUser
if TYPE_CHECKING:
from app.models.formation import Formation
from app.models.formation import FormationRead
class UserBase(SQLModel):
is_admin: bool = Field(default=None)
name: Optional[str] = None
email: Optional[str] = None
password: Optional[str] = None
class User(UserBase, table=True):
id: int = Field(default=None, primary_key=True)
formations: List["Formation"] = Relationship(back_populates="users", link_model=FormationUser)
and
from typing import Optional, List, TYPE_CHECKING
from sqlmodel import SQLModel, Field, Relationship
from app.models.formation_user import FormationUser
if TYPE_CHECKING:
from app.models.user import User
class FormationBase(SQLModel):
formation_name: Optional[str] = None
program_description: Optional[str] = None
objective_description: Optional[str] = None
who: Optional[str] = None
requirements: Optional[str] = None
duration_days: Optional[int] = None
duration_hours: Optional[int] = None
access_delay: Optional[int] = None
price: Optional[int] = None
disable_access: Optional[bool] = None
satisfaction_rate: Optional[float] = Field(default=None)
owner_id: Optional[int] = Field(default=None, foreign_key="user.id")
connected using this db :
from typing import Optional, List, TYPE_CHECKING
from sqlmodel import SQLModel, Field, Relationship
class FormationUser(SQLModel, table=True):
user_id: Optional[int] = Field(default=None, foreign_key="user.id", primary_key=True)
formation_id: Optional[int] = Field(default=None, foreign_key="formation.id", primary_key=True)Description
I tried to create a relation between 2 database with an intermediate database but it's not displayed in my /docs (i m using fastapi)
I using multiple files for models and juste basic request sql (see below).
I've read another github issue that say that i need to downgrade my version of sqlalchemy and upgrade my version of fastapi but nothing make it works, i need to know if it's a problem with sqlmodel or if i am the problem.
Operating System
Linux
Operating System Details
I use arch with a local database on postgres
SQLModel Version
latest (0.0.6)
Python Version
3.10
Additional Context
the function that i use for post a user by my docs on fastapi:
async def post_users(user: UserCreate):
with Session(engine) as session:
db_user = User.from_orm(user)
session.add(db_user)
session.commit()
session.refresh(db_user)
return db_user
Activity
markzhang0928 commented on Jul 29, 2022
#383 (comment)
YuriiMotov commented on Aug 7, 2025
See #315
It was fixed by #461.