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🗑️ Deprecate const and unique_items in Field #1732

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🗑️ Deprecate const and unique_items in Field #1732

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e87feed
Deprecate `const` parameter of `Field`
YuriiMotov Jan 29, 2026
81403a5
Deprecate `unique_items` parameter of `Field`
YuriiMotov Jan 29, 2026
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55 changes: 45 additions & 10 deletions sqlmodel/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
import builtins
import ipaddress
import uuid
import warnings
import weakref
from collections.abc import Mapping, Sequence, Set
from datetime import date, datetime, time, timedelta
Expand All @@ -11,6 +12,7 @@
from pathlib import Path
from typing import (
TYPE_CHECKING,
Annotated,
Any,
Callable,
ClassVar,
Expand Down Expand Up @@ -89,6 +91,11 @@
]
OnDeleteType = Literal["CASCADE", "SET NULL", "RESTRICT"]

CONST_DEPRECATION_MSG = "`const` is deprecated and doesn't work, use `Literal` instead"
UNIQUE_ITEMS_DEPRECATION_MSG = (
"`unique_items` is deprecated and doesn't work, use `set` type instead"
)


def __dataclass_transform__(
*,
Expand Down Expand Up @@ -213,7 +220,10 @@ def Field(
description: Optional[str] = None,
exclude: Union[Set[Union[int, str]], Mapping[Union[int, str], Any], Any] = None,
include: Union[Set[Union[int, str]], Mapping[Union[int, str], Any], Any] = None,
const: Optional[bool] = None,
const: Annotated[
Optional[bool],
deprecated(CONST_DEPRECATION_MSG),
] = None,
gt: Optional[float] = None,
ge: Optional[float] = None,
lt: Optional[float] = None,
Expand All @@ -223,7 +233,10 @@ def Field(
decimal_places: Optional[int] = None,
min_items: Optional[int] = None,
max_items: Optional[int] = None,
unique_items: Optional[bool] = None,
unique_items: Annotated[
Optional[bool],
deprecated(UNIQUE_ITEMS_DEPRECATION_MSG),
] = None,
min_length: Optional[int] = None,
max_length: Optional[int] = None,
allow_mutation: bool = True,
Expand Down Expand Up @@ -256,7 +269,10 @@ def Field(
description: Optional[str] = None,
exclude: Union[Set[Union[int, str]], Mapping[Union[int, str], Any], Any] = None,
include: Union[Set[Union[int, str]], Mapping[Union[int, str], Any], Any] = None,
const: Optional[bool] = None,
const: Annotated[
Optional[bool],
deprecated(CONST_DEPRECATION_MSG),
] = None,
gt: Optional[float] = None,
ge: Optional[float] = None,
lt: Optional[float] = None,
Expand All @@ -266,7 +282,10 @@ def Field(
decimal_places: Optional[int] = None,
min_items: Optional[int] = None,
max_items: Optional[int] = None,
unique_items: Optional[bool] = None,
unique_items: Annotated[
Optional[bool],
deprecated(UNIQUE_ITEMS_DEPRECATION_MSG),
] = None,
min_length: Optional[int] = None,
max_length: Optional[int] = None,
allow_mutation: bool = True,
Expand Down Expand Up @@ -308,7 +327,10 @@ def Field(
description: Optional[str] = None,
exclude: Union[Set[Union[int, str]], Mapping[Union[int, str], Any], Any] = None,
include: Union[Set[Union[int, str]], Mapping[Union[int, str], Any], Any] = None,
const: Optional[bool] = None,
const: Annotated[
Optional[bool],
deprecated(CONST_DEPRECATION_MSG),
] = None,
gt: Optional[float] = None,
ge: Optional[float] = None,
lt: Optional[float] = None,
Expand All @@ -318,7 +340,10 @@ def Field(
decimal_places: Optional[int] = None,
min_items: Optional[int] = None,
max_items: Optional[int] = None,
unique_items: Optional[bool] = None,
unique_items: Annotated[
Optional[bool],
deprecated(UNIQUE_ITEMS_DEPRECATION_MSG),
] = None,
min_length: Optional[int] = None,
max_length: Optional[int] = None,
allow_mutation: bool = True,
Expand All @@ -341,7 +366,10 @@ def Field(
description: Optional[str] = None,
exclude: Union[Set[Union[int, str]], Mapping[Union[int, str], Any], Any] = None,
include: Union[Set[Union[int, str]], Mapping[Union[int, str], Any], Any] = None,
const: Optional[bool] = None,
const: Annotated[
Optional[bool],
deprecated(CONST_DEPRECATION_MSG),
] = None,
gt: Optional[float] = None,
ge: Optional[float] = None,
lt: Optional[float] = None,
Expand All @@ -351,7 +379,10 @@ def Field(
decimal_places: Optional[int] = None,
min_items: Optional[int] = None,
max_items: Optional[int] = None,
unique_items: Optional[bool] = None,
unique_items: Annotated[
Optional[bool],
deprecated(UNIQUE_ITEMS_DEPRECATION_MSG),
] = None,
min_length: Optional[int] = None,
max_length: Optional[int] = None,
allow_mutation: bool = True,
Expand All @@ -371,6 +402,12 @@ def Field(
schema_extra: Optional[dict[str, Any]] = None,
) -> Any:
current_schema_extra = schema_extra or {}

if const is not None:
warnings.warn(CONST_DEPRECATION_MSG, DeprecationWarning, stacklevel=2)
if unique_items is not None:
warnings.warn(UNIQUE_ITEMS_DEPRECATION_MSG, DeprecationWarning, stacklevel=2)

# Extract possible alias settings from schema_extra so we can control precedence
schema_validation_alias = current_schema_extra.pop("validation_alias", None)
schema_serialization_alias = current_schema_extra.pop("serialization_alias", None)
Expand All @@ -380,7 +417,6 @@ def Field(
"description": description,
"exclude": exclude,
"include": include,
"const": const,
"gt": gt,
"ge": ge,
"lt": lt,
Expand All @@ -390,7 +426,6 @@ def Field(
"decimal_places": decimal_places,
"min_items": min_items,
"max_items": max_items,
"unique_items": unique_items,
"min_length": min_length,
"max_length": max_length,
"allow_mutation": allow_mutation,
Expand Down
20 changes: 20 additions & 0 deletions tests/test_pydantic/test_field.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,3 +54,23 @@ class Model(SQLModel):

instance = Model(id=123, foo="bar")
assert "foo=" not in repr(instance)


def test_const_is_deprecated():
with pytest.warns(
DeprecationWarning,
match="`const` is deprecated and doesn't work, use `Literal` instead",
):

class Model(SQLModel):
int_value: int = Field(default=10, const=True)


def test_unique_items_is_deprecated():
with pytest.warns(
DeprecationWarning,
match="`unique_items` is deprecated and doesn't work, use `set` type instead",
):

class Model(SQLModel):
values: list[int] = Field(unique_items=True)