fastapi + sqlalchemy + pydantic → how to process relations - sqlalchemy

Question

Using FastAPI I can't fetch all the data. For example I have this output :
Response body Download (but the items list is always empty):
[
{
"email": "mmm#gmail.com",
"id": 1,
"is_active": true,
"items": []
},
{
"email": "ee#gmail.com",
"id": 2,
"is_active": true,
"items": []
},
]
Endpoint are for example:
#app.get("/users/", response_model=list[schemas.User])
async def read_users(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
users = crud.get_users(db, skip=skip, limit=limit)
return users
#app.get("/users/{user_id}", response_model=schemas.User)
async def read_user(user_id: int, db: Session = Depends(get_db)):
db_user = crud.get_user(db, user_id=user_id)
if db_user is None:
raise HTTPException(status_code=404, detail="User not found")
return db_user
I have the following schemas (database is PostgreSQL):
from pydantic import BaseModel
class ItemBase(BaseModel):
title: str
description: str | None = None
class ItemCreate(ItemBase):
pass
class Item(ItemBase):
id: int
owner: int
class Config:
orm_mode = True
class UserBase(BaseModel):
email: str
class UserCreate(UserBase):
password: str
class User(UserBase):
id: int
is_active: bool
items: list[Item] = []
class Config:
orm_mode = True
Database is postgresql
Models are (table users and table items):
from sqlalchemy import Boolean, Column, ForeignKey, Integer, String
from sqlalchemy.orm import relationship
from .database import Base
class User(Base):
__tablename__ = "users"
__table_args__ = {'schema': 'socialcampaigns'}
id = Column(Integer, primary_key=True, index=True)
email = Column(String, unique=True, index=True)
hashed_password = Column(String)
is_active = Column(Boolean, default=True)
items_rel = relationship("Item", back_populates="owner_id_rel")
class Item(Base):
__tablename__ = "items"
__table_args__ = {'schema': 'socialcampaigns'}
id = Column(Integer, primary_key=True, index=True)
title = Column(String, index=True)
description = Column(String, index=True)
owner = Column(Integer, ForeignKey("socialcampaigns.users.id"))
owner_id_rel = relationship("User", back_populates="items_rel")
Crud code is:
from sqlalchemy.orm import Session
from . import models, schemas
def get_user(db: Session, user_id: int):
return db.query(models.User).filter(models.User.id == user_id).first()
def get_users (db: Session, skip: int = 0, limit: int = 100):
return db.query(models.User).offset(skip).limit(limit).all()
How to solve it? How do I view the list of Items when viewing users?