*
     * @param item the character mapping item to update
     */
    @Override
    public synchronized void update(final CharMappingItem item) {
        try (MappingUpdater updater = new MappingUpdater(item)) {
            reload(updater);
        }
    }

    /**
     * Deletes a character mapping item from the dictionary file.
     *

{* ../../docs_src/pydantic_v1_in_v2/tutorial003_an_py310.py hl[2:3,6,12,21:22] *}

В примере выше модель входных данных — это модель Pydantic v1, а модель выходных данных (указанная в `response_model=ItemV2`) — это модель Pydantic v2.

### Параметры Pydantic v1 { #pydantic-v1-parameters }

</div>

### HTTPS ile Redirect'ler { #redirects-with-https }

Örneğin `/items/` adında bir *path operation* tanımladığınızı düşünelim:

{* ../../docs_src/behind_a_proxy/tutorial001_01_py310.py hl[6] *}

Client `/items`'a gitmeye çalışırsa, varsayılan olarak `/items/`'a redirect edilir.

Ancak *CLI Option* `--forwarded-allow-ips` ayarlanmadan önce, `http://localhost:8000/items/`'a redirect edebilir.

{* ../../docs_src/pydantic_v1_in_v2/tutorial003_an_py310.py hl[2:3,6,12,21:22] *}

No exemplo acima, o modelo de entrada é um modelo Pydantic v1, e o modelo de saída (definido em `response_model=ItemV2`) é um modelo Pydantic v2.

### Parâmetros do Pydantic v1 { #pydantic-v1-parameters }

    return id


@app.get("/items/")
async def read_items(
    id: Annotated[str | None, AfterValidator(check_valid_id)] = None,
):
    if id:
        item = data.get(id)
    else:
        id, item = random.choice(list(data.items()))

例如，假设你有 4 个 API 路径操作（*端点*）：

* `/items/public/`
* `/items/private/`
* `/users/{user_id}/activate`
* `/items/pro/`

你可以仅通过依赖项及其子依赖项为它们添加不同的权限要求：

```mermaid
graph TB

current_user(["current_user"])
active_user(["active_user"])
admin_user(["admin_user"])
paying_user(["paying_user"])

public["/items/public/"]
private["/items/private/"]
activate_user["/users/{user_id}/activate"]

from fastapi import FastAPI
from fastapi.testclient import TestClient

swagger_ui_oauth2_redirect_url = "/docs/redirect"

app = FastAPI(swagger_ui_oauth2_redirect_url=swagger_ui_oauth2_redirect_url)


@app.get("/items/")
async def read_items():
    return {"id": "foo"}


client = TestClient(app)


def test_swagger_ui():
    response = client.get("/docs")
    assert response.status_code == 200, response.text

    """Test that serialize_sequence_value handles optional lists correctly."""
    from fastapi._compat import v2

    field_info = FieldInfo(annotation=list[str] | None)
    field = v2.ModelField(name="items", field_info=field_info)
    result = v2.serialize_sequence_value(field=field, value=["a", "b", "c"])
    assert result == ["a", "b", "c"]
    assert isinstance(result, list)

    assert app.openapi()["paths"][path]["get"]["parameters"] == snapshot(
        [
            {
                "required": False,
                "schema": {
                    "anyOf": [
                        {"items": {"type": "string"}, "type": "array"},
                        {"type": "null"},
                    ],
                    "title": "P",
                },
                "name": "p",
                "in": "query",

                "GRADLE_RUNNER",
                "KILL_PROCESSES_STARTED_BY_GRADLE",
                "CHECK_CLEAN_M2_ANDROID_USER_HOME",
            ),
            steps.items.map(BuildStep::name),
        )
        assertEquals(expectedRunnerParam(), steps.getGradleStep("GRADLE_RUNNER").gradleParams)
    }

    @ParameterizedTest
    @CsvSource(
        value = [