Cannot get nested objects when converting to dict

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

import sqlalchemy as sa
from sqlalchemy import func
from sqlalchemy import orm
from sqlmodel import Field, Relationship, SQLModel


class Address(SQLModel, table=True):
    __tablename__ = 'addresses'

    id: Optional[int] = Field(default=None, primary_key=True, nullable=False)
    listing: 'Listing' = Relationship(back_populates='address')
    location: 'Location' = Relationship(back_populates='addresses')

class ListingImage(SQLModel, table=True):
    __tablename__ = 'listing_images'

    id: Optional[int] = Field(default=None, primary_key=True, nullable=False)
    listing: 'Listing' = Relationship(back_populates='images')
    file: str = Field(max_length=255, nullable=False)
    listing_id: int = Field(foreign_key='listings.id', nullable=False)

class Listing(SQLModel, table=True):
    __tablename__ = 'listings'

    created: Optional[datetime] = Field(sa_column_kwargs={'server_default': func.now()}, index=True)
    title: str = Field(max_length=100, nullable=False)
    price: int = Field(nullable=False)
    address_id: int = Field(foreign_key='addresses.id', nullable=True)
    id: Optional[int] = Field(default=None, primary_key=True, nullable=False)
    images: List['ListingImage'] = Relationship(back_populates='listing', sa_relationship_kwargs={'cascade': 'all, delete'})
    address: 'Address' = Relationship(back_populates='listing', sa_relationship_kwargs={'cascade': 'all, delete', 'uselist': False})

    __mapper_args__ = {"eager_defaults": True}



async def get_multi(
    self, db: AsyncSession, *, skip: int = 0, limit: int = 100, order: Any = None, **filters
) -> List[Listing]:
    stmt = sa.select(Listing).options(orm.selectinload(Listing.images), orm.selectinload(Listing.address)).filter_by(**filters).order_by(order).offset(skip).limit(limit)
    result = await db.scalars(stmt)
    return result.all()

##### in some async function ####

data = await get_multi(....)

data[0].address
shows Address(...) object normally

data[0].dict()

{
"id":..
"created":...
"title":...
"price":...
"address_id":...
}

no "images" or "address" nested object after converting to dict

Description

When trying to convert an object using .dict() or .json() the resulting object does not include the nested fields like Address or Images in my example.

I am using SQLAlchemy AsyncSession and doing eager loading of the objects when quering the DB. The nested object shows normally when trying to access it but it doesn’t show up in resulting dict and json object and by contrast not being sent in FastAPI response.

I can confirm this is not the case in Pydantic and models from Pydantic work fine when converted to dict.

Operating System

Windows

Operating System Details

No response

SQLModel Version

0.0.6

Python Version

3.8.8

Additional Context

No response

[byrman]

Not sure you will get it working for table models, you’ll probably need models with table=False. I tried my own suggestion for data models and it works fine.

[tiangolo]

Thanks for the help here everyone! 👏 🙇

Thanks for reporting back and closing the issue @farahats9 👍