gistfile1.txt

from pydantic import BaseModel, ConfigDict, Field


class Foo(BaseModel):
    class_id: int = Field(validation_alias="id", serialization_alias="id")

    model_config = ConfigDict(validate_by_name=True, serialize_by_alias=True)


class TestFoo:
    def test_serialization_with_alias(self):
        foo = Foo(class_id=123)
        json_data = foo.model_dump()
        assert json_data == {"id": 123}

    def test_deserialization_with_alias(self):
        json_data = {"id": 456}
        foo = Foo.model_validate(json_data)
        assert foo.class_id == 456

    def test_serialization_without_alias(self):
        foo = Foo(class_id=789)
        json_data = foo.model_dump(by_alias=False)
        assert json_data == {"class_id": 789}

    def test_json_serialization_with_alias(self):
        foo = Foo(class_id=101)
        json_str = foo.model_dump_json()
        assert json_str == '{"id":101}'

    def test_json_deserialization_with_alias(self):
        json_str = '{"id":202}'
        foo = Foo.model_validate_json(json_str)
        assert foo.class_id == 202