SQLModel with type statement + Annotated field results in "TypeError: issubclass() arg 1 must be a class"

[nernst]

First Check

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• I already checked if it is not related to SQLModel but to SQLAlchemy.

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Example Code

from typing import Annotated, TypeAlias
from sqlmodel import Field, SQLModel

type Id = Annotated[int, Field(primary_key=True)]
# Changing to this works:
# Id: TypeAlias = Annotated[int, Field(primary_key=True)]


class HasAnnotatedColumn(SQLModel, table=True):
    id: Id

Description

Using typing.Annotated + type statement results in:

Traceback (most recent call last):
  File "/workspaces/maven.tse.opsdata/repro.py", line 8, in <module>
    class HasAnnotatedColumn(SQLModel, table=True):
  File "/workspace/.venv/lib/python3.12/site-packages/sqlmodel/main.py", line 559, in __new__
    col = get_column_from_field(v)
          ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/.venv/lib/python3.12/site-packages/sqlmodel/main.py", line 708, in get_column_from_field
    sa_type = get_sqlalchemy_type(field)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspace/.venv/lib/python3.12/site-packages/sqlmodel/main.py", line 656, in get_sqlalchemy_type
    if issubclass(type_, Enum):
       ^^^^^^^^^^^^^^^^^^^^^^^
TypeError: issubclass() arg 1 must be a class

Operating System

Linux

Operating System Details

cat /etc/os-release:
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

SQLModel Version

0.0.22

Python Version

Python 3.12.7

Additional Context

There is a workaround available by using a TypeAlias instead of a type statement; the type statement results in a typing.TypeAliasType, which has a __value__ property that has the aliased type definition.

This is similar to #67 , but I suspect a slightly different use case/problem.