from pydantic import BaseModel, ConfigDict
from pydantic.fields import FieldInfo

from .utils import needs_py310


def test_model_field_default_required():
    from fastapi._compat import v2

    # For coverage
    field_info = FieldInfo(annotation=str)
    field = v2.ModelField(name="foo", field_info=field_info)
    assert field.default is Undefined


def test_complex():
    app = FastAPI()

            field_info = params.Body(annotation=use_annotation, default=default_value)
        else:
            field_info = params.Query(annotation=use_annotation, default=default_value)

    field = None
    # It's a field_info, not a dependency
    if field_info is not None:
        # Handle field_info.in_
        if is_path_param:
            assert isinstance(field_info, params.Path), (

            default_convert_underscores = getattr(
                first_field.field_info, "convert_underscores", True
            )
    for param_type, param_group in parameter_groups:
        for param in param_group:
            field_info = param.field_info
            # field_info = cast(Param, field_info)
            if not getattr(field_info, "include_in_schema", True):
                continue

            f" Please update the response model {type_!r}."
        )
    class_validators = class_validators or {}

    field_info = field_info or FieldInfo(annotation=type_, default=default, alias=alias)
    kwargs = {"mode": mode, "name": name, "field_info": field_info}
    try:
        return v2.ModelField(**kwargs)  # type: ignore[return-value,arg-type]
    except PydanticSchemaGenerationError:

    assert dependant.call is not None, "dependant.call must be a function"
    is_coroutine = dependant.is_coroutine_callable
    is_body_form = body_field and isinstance(body_field.field_info, params.Form)
    if isinstance(response_class, DefaultPlaceholder):
        actual_response_class: type[Response] = response_class.value
    else:
        actual_response_class = response_class

`Field` 的工作方式和 `Query`、`Path`、`Body` 相同，参数也相同。

/// note | 技术细节

实际上，`Query`、`Path` 都是 `Params` 的子类，而 `Params` 类又是 Pydantic 中 `FieldInfo` 的子类。

Pydantic 的 `Field` 返回也是 `FieldInfo` 的类实例。

`Body` 直接返回的也是 `FieldInfo` 的子类的对象。后文还会介绍一些 `Body` 的子类。

注意，从 `fastapi` 导入的 `Query`、`Path` 等对象实际上都是返回特殊类的函数。

///

/// tip | 提示

Actually, `Query`, `Path` and others you'll see next create objects of subclasses of a common `Param` class, which is itself a subclass of Pydantic's `FieldInfo` class.

And Pydantic's `Field` returns an instance of `FieldInfo` as well.

`Body` also returns objects of a subclass of `FieldInfo` directly. And there are others you will see later that are subclasses of the `Body` class.

Насправді, `Query`, `Path` та інші, що ви побачите далі, створюють об'єкти підкласів загального класу `Param`, котрий сам є підкласом класу `FieldInfo` з Pydantic.

І `Field` від Pydantic також повертає екземпляр `FieldInfo`.

`Body` також безпосередньо повертає об'єкти підкласу `FieldInfo`. І є інші підкласи, які ви побачите пізніше, що є підкласами класу Body.

Na realidade, `Query`, `Path` e outros que você verá em seguida, criam objetos de subclasses de uma classe `Param` comum, que é ela mesma uma subclasse da classe `FieldInfo` do Pydantic.

E `Field` do Pydantic retorna uma instância de `FieldInfo` também.

`Body` também retorna objetos de uma subclasse de `FieldInfo` diretamente. E tem outras que você verá mais tarde que são subclasses da classe `Body`.

Und Pydantics `Field` gibt ebenfalls eine Instanz von `FieldInfo` zurück.

`Body` gibt auch direkt Instanzen einer Unterklasse von `FieldInfo` zurück. Später werden Sie andere sehen, die Unterklassen der `Body`-Klasse sind.