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from __future__ import annotations
from typing import Any, cast
import pytest
from pydantic import (
BaseModel,
PydanticDeprecatedSince212,
ValidationInfo,
ValidatorFunctionWrapHandler,
model_validator,
)
def test_model_validator_wrap() -> None:
class Model(BaseModel):
x: int
y: int
@model_validator(mode='wrap')
@classmethod
def val_model(cls, values: dict[str, Any] | Model, handler: ValidatorFunctionWrapHandler) -> Model:
if isinstance(values, dict):
assert values == {'x': 1, 'y': 2}
model = handler({'x': 2, 'y': 3})
else:
assert values.x == 1
assert values.y == 2
model = handler(Model.model_construct(x=2, y=3))
assert model.x == 2
assert model.y == 3
model.x = 20
model.y = 30
return model
assert Model(x=1, y=2).model_dump() == {'x': 20, 'y': 30}
assert Model.model_validate(Model.model_construct(x=1, y=2)).model_dump() == {'x': 20, 'y': 30}
@pytest.mark.parametrize('classmethod_decorator', [classmethod, lambda x: x])
def test_model_validator_before(classmethod_decorator: Any) -> None:
class Model(BaseModel):
x: int
y: int
@model_validator(mode='before')
@classmethod_decorator
def val_model(cls, values: Any, info: ValidationInfo) -> dict[str, Any] | Model:
assert not info.context
if isinstance(values, dict):
values = cast(dict[str, Any], values)
values['x'] += 1
values['y'] += 1
else:
assert isinstance(values, Model)
values.x += 1
values.y += 1
return values
m = Model(x=1, y=2)
assert m.model_dump() == {'x': 2, 'y': 3}
# model not changed because we don't revalidate m
assert Model.model_validate(m).model_dump() == {'x': 2, 'y': 3}
@pytest.mark.parametrize('classmethod_decorator', [classmethod, lambda x: x])
def test_model_validator_before_revalidate_always(classmethod_decorator: Any) -> None:
class Model(BaseModel, revalidate_instances='always'):
x: int
y: int
@model_validator(mode='before')
@classmethod_decorator
def val_model(cls, values: Any, info: ValidationInfo) -> dict[str, Any] | Model:
assert not info.context
if isinstance(values, dict):
values = cast(dict[str, Any], values)
values['x'] += 1
values['y'] += 1
else:
assert isinstance(values, Model)
values.x += 1
values.y += 1
return values
assert Model(x=1, y=2).model_dump() == {'x': 2, 'y': 3}
assert Model.model_validate(Model(x=1, y=2)).model_dump() == {'x': 3, 'y': 4}
def test_model_validator_after() -> None:
class Model(BaseModel):
x: int
y: int
@model_validator(mode='after')
def val_model(self, info: ValidationInfo) -> Model:
assert not info.context
self.x += 1
self.y += 1
return self
assert Model(x=1, y=2).model_dump() == {'x': 2, 'y': 3}
assert Model.model_validate(Model(x=1, y=2)).model_dump() == {'x': 3, 'y': 4}
def test_subclass() -> None:
class Human(BaseModel):
@model_validator(mode='before')
@classmethod
def run_model_validator(cls, values: dict[str, Any]) -> dict[str, Any]:
values['age'] *= 2
return values
class Person(Human):
age: int
assert Person(age=28).age == 56
def test_nested_models() -> None:
calls: list[str] = []
class Model(BaseModel):
inner: Model | None
@model_validator(mode='before')
@classmethod
def validate_model_before(cls, values: dict[str, Any]) -> dict[str, Any]:
calls.append('before')
return values
@model_validator(mode='after')
def validate_model_after(self) -> Model:
calls.append('after')
return self
Model.model_validate({'inner': None})
assert calls == ['before', 'after']
calls.clear()
Model.model_validate({'inner': {'inner': {'inner': None}}})
assert calls == ['before'] * 3 + ['after'] * 3
calls.clear()
def test_after_validator_wrong_signature() -> None:
with pytest.warns(PydanticDeprecatedSince212):
class Model1(BaseModel):
@model_validator(mode='after')
# This is converted into a class method, but deprecated
# as it should be an instance method:
def validator(cls, model, info: ValidationInfo):
assert isinstance(model, cls)
assert info.mode == 'python'
return model
with pytest.warns(PydanticDeprecatedSince212):
class Model2(BaseModel):
@model_validator(mode='after')
# This is accepted as a class method, but deprecated
# as it should be an instance method:
@classmethod
def validator(cls, model, info: ValidationInfo):
assert isinstance(model, cls)
assert info.mode == 'python'
return model
with pytest.warns(PydanticDeprecatedSince212):
class Model3(BaseModel):
@model_validator(mode='after')
# This is converted into a class method, but deprecated
# as it should be an instance method:
def validator(cls, model):
assert isinstance(model, cls)
return model
with pytest.warns(PydanticDeprecatedSince212):
class Model4(BaseModel):
@model_validator(mode='after')
# This is accepted as a class method, but deprecated
# as it should be an instance method:
@classmethod
def validator(cls, model):
assert isinstance(model, cls)
return model
Model1()
Model2()
Model3()
Model4()
|
