"price": 50.5,
                "description": "Some Foo",
                "tax": 0.1,
            },
            "user": {"username": "johndoe", "full_name": "John Doe"},
        },
    )
    assert response.status_code == 200
    assert response.json() == {
        "item_id": 5,
        "item": {
            "name": "Foo",
            "price": 50.5,
            "description": "Some Foo",
            "tax": 0.1,

from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None


items = [
    Item(name="Plumbus", description="A multi-purpose household device."),
    Item(name="Portal Gun", description="A portal opening device."),
    Item(name="Meeseeks Box", description="A box that summons a Meeseeks."),
]


@app.get("/items/stream")

            "externalDocs": {
                "description": "External API documentation.",
                "url": "https://docs.example.com/api-general",
            },
            "paths": {
                "/api_route": {
                    "get": {
                        "responses": {
                            "200": {
                                "description": "Successful Response",

      <version>1.0.0+</version>
      <description>A custom lifecycle mapping definition.</description>
      <fields>
        <field>
          <name>id</name>
          <required>true</required>
          <version>1.0.0+</version>
          <type>String</type>
          <description>The ID of this lifecycle, for identification in the mojo descriptor.</description>
        </field>
        <field>
          <name>phases</name>

@router.get("/a", responses={501: {"description": "Error 1"}})
async def a():
    return "a"


@router.get(
    "/b",
    responses={
        502: {"description": "Error 2"},
        "4XX": {"description": "Error with range, upper"},
    },
)
async def b():
    return "b"


@router.get(
    "/c",
    responses={
        "400": {"description": "Error with str"},

                        "responses": {
                            "200": {
                                "description": "Successful Response",
                                "content": {"application/json": {"schema": {}}},
                            },
                            "422": {
                                "description": "Validation Error",
                                "content": {

        "/items/",
        headers={"X-Token": "coneofsilence"},
        json={"id": "foobar", "title": "Foo Bar", "description": "The Foo Barters"},
    )
    assert response.status_code == 200
    assert response.json() == {
        "id": "foobar",
        "title": "Foo Bar",
        "description": "The Foo Barters",
    }


def test_create_item_bad_token():
    response = client.post(
        "/items/",

                        "responses": {
                            "200": {
                                "description": "Successful Response",
                                "content": {"application/json": {"schema": {}}},
                            },
                            "422": {
                                "description": "Validation Error",
                                "content": {

        == response2.json()
        == [
            {"name": "Plumbus", "description": None, "sub": None},
            {
                "name": "Portal Gun",
                "description": "Device to travel through the multi-rick-verse",
                "sub": None,
            },
        ]
    )


def test_read_items():
    client = get_app_client()
    client_no = get_app_client(separate_input_output_schemas=False)

{* ../../docs_src/separate_openapi_schemas/tutorial001_py310.py ln[1:15] hl[14] *}

... alors, le champ `description` ne sera **pas requis**. Parce qu'il a une valeur par défaut de `None`.

### Modèle d'entrée dans les documents { #input-model-in-docs }

Vous pouvez le confirmer dans les documents, le champ `description` n'a pas d'**astérisque rouge**, il n'est pas indiqué comme requis :

<div class="screenshot">