🐛 Support mixins

sqlmodel/main.py

@@ -319,7 +319,7 @@ def __init__(
         # triggers an error
         base_is_table = False
         for base in bases:
-            config = getattr(base, "__config__")
+            config = getattr(base, "__config__", None)
             if config and getattr(config, "table", False):
                 base_is_table = True
                 break

tests/test_mixin.py

@@ -0,0 +1,23 @@
+from typing import Optional
+
+import pytest
+from sqlmodel import Field, SQLModel
+
+
+class FooMixin:
+    pass
+
+
+@pytest.mark.usefixtures("clear_sqlmodel")
+def test_mixin():
+    """Test SQLModel in combination with a mixin.
+
+    https://github.com/tiangolo/sqlmodel/issues/254
+
+    """
+
+    class Hero(FooMixin, SQLModel, table=True):
+        id: Optional[int] = Field(default=None, primary_key=True)
+        name: str
+        secret_name: str
+        age: Optional[int] = None