int had = 0;
        ArrayList<String> items = new ArrayList<>();
        for (O option : options) {
            Optional<List<String>> o = getter.apply(option);
            if (o.isPresent()) {
                had++;
                items.addAll(o.get());
            }
        }
        return had == 0 ? Optional.empty() : Optional.of(List.copyOf(items));
    }

        raise ValueError('Invalid ID format, it must start with "isbn-" or "imdb-"')
    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()))

    follow_redirects=False,
)


def test_redirect() -> None:
    response = client.get("/items")
    assert response.status_code == 307
    assert response.headers["location"] == "https://example.com/items/"


def test_no_redirect() -> None:
    response = client.get("/items/")
    assert response.status_code == 200

Por ejemplo, digamos que tienes 4 endpoints de API (*path operations*):

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

entonces podrías agregar diferentes requisitos de permiso para cada uno de ellos solo con dependencias y sub-dependencias:

```mermaid
graph TB

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

				data-bs-toggle="collapse"> <c:if test="${empty lang}">
						<la:message key="labels.searchoptions_all" />
					</c:if> <c:if test="${!empty lang}">
						<c:forEach var="sLang" items="${lang}">
							<c:forEach var="item" items="${langItems}">
								<c:if test="${item.value==sLang}">${f:h(item.label)}</c:if>
							</c:forEach>
						</c:forEach>
					</c:if>
			</a></li>
			<c:if test="${displayLabelTypeItems}">

				data-bs-toggle="collapse"> <c:if test="${empty lang}">
						<la:message key="labels.searchoptions_all" />
					</c:if> <c:if test="${!empty lang}">
						<c:forEach var="sLang" items="${lang}">
							<c:forEach var="item" items="${langItems}">
								<c:if test="${item.value==sLang}">${f:h(item.label)}</c:if>
							</c:forEach>
						</c:forEach>
					</c:if>
			</a></li>
			<c:if test="${displayLabelTypeItems}">

            "q": self.q,
            "items": [],
        }


def get_db_paginator(
    offset: int = 0, limit: int = 100, q: str | None = None
) -> DatabasePaginator:
    return DatabasePaginator(offset=offset, limit=limit, q=q)


PaginatorDep = Annotated[DatabasePaginator, Depends(get_db_paginator)]


@app.get("/items/")
async def read_items(paginator: PaginatorDep):

    """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)