Problem with relationship in SQLmodel and fastapi

[Beafowl-Pull]

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

[markzhang0928]

#383 (comment)

[YuriiMotov]

See #315

It was fixed by #461.