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fix: support StringConstraints metadata in SQLAlchemy type generation #2001

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fix: support StringConstraints metadata in SQLAlchemy type generation #2001

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fix: support StringConstraints metadata in SQLAlchemy type generation
Sujit-1509 Jun 10, 2026
8509853
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pre-commit-ci-lite[bot] Jun 10, 2026
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3 changes: 2 additions & 1 deletion sqlmodel/_compat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
from pydantic import VERSION as P_VERSION
from pydantic import BaseModel
from pydantic import ConfigDict as ConfigDict
from pydantic import StringConstraints as StringConstraints
from pydantic._internal._fields import PydanticMetadata
from pydantic._internal._model_construction import ModelMetaclass as ModelMetaclass
from pydantic._internal._repr import Representation as Representation
Expand Down Expand Up @@ -200,7 +201,7 @@ def get_sa_type_from_field(field: Any) -> Any:

def get_field_metadata(field: Any) -> Any:
for meta in field.metadata:
if isinstance(meta, (PydanticMetadata, MaxLen)):
if isinstance(meta, (PydanticMetadata, MaxLen, StringConstraints)):
return meta
return FakeMetadata()

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12 changes: 12 additions & 0 deletions tests/test_main.py
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Expand Up @@ -216,3 +216,15 @@ class Hero(SQLModel, table=True):
assert len(foreign_keys) == 1
assert foreign_keys[0].ondelete == "CASCADE"
assert team_id_column.nullable is False


def test_string_constraints_max_length(clear_sqlmodel):
from typing import Annotated

from pydantic import StringConstraints

class Item(SQLModel, table=True):
id: int | None = Field(default=None, primary_key=True)
name: Annotated[str, StringConstraints(max_length=50)]

assert Item.__table__.c.name.type.length == 50
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