price: float

    Item = Annotated[
        Union[Annotated[FirstItem, Tag("first")], Annotated[OtherItem, Tag("other")]],
        Field(discriminator="value"),
    ]

    @app.post("/items/")
    def save_union_body_discriminator(
        item: Item, q: Annotated[str, Field(description="Query string")]
    ) -> dict[str, Any]:
        return {"item": item}

    client = TestClient(app)

Lo primero que hay que notar es que estamos definiendo una función asíncrona con `yield`. Esto es muy similar a las Dependencias con `yield`.

{* ../../docs_src/events/tutorial003_py39.py hl[14:19] *}

La primera parte de la función, antes del `yield`, será ejecutada **antes** de que la aplicación comience.

Y la parte después del `yield` será ejecutada **después** de que la aplicación haya terminado.

        // Set max_recv field using reflection (default is 4280 in parent class)
        Field maxRecvField = DcerpcHandle.class.getDeclaredField("max_recv");
        maxRecvField.setAccessible(true);
        maxRecvField.set(handle, 4280);

        // Inject mocks using reflection
        Field pipeField = DcerpcPipeHandle.class.getDeclaredField("pipe");
        pipeField.setAccessible(true);

Есть несколько отличий:

* `table=True` сообщает SQLModel, что это *модель-таблица*, она должна представлять **таблицу** в SQL базе данных, это не просто *модель данных* (как обычный класс Pydantic).

* `Field(primary_key=True)` сообщает SQLModel, что `id` — это **первичный ключ** в SQL базе данных (подробнее о первичных ключах SQL можно узнать в документации SQLModel).

        queryBuilderList.add(builder);
    }

    protected void regOBA(String field) {
        registerOrderBy(field, true);
    }

    protected void regOBD(String field) {
        registerOrderBy(field, false);
    }

    protected void registerOrderBy(String field, boolean ascOrDesc) {
        assertObjectNotNull("field", field);
        if (fieldSortBuilderList == null) {

        queryBuilderList.add(builder);
    }

    protected void regOBA(String field) {
        registerOrderBy(field, true);
    }

    protected void regOBD(String field) {
        registerOrderBy(field, false);
    }

    protected void registerOrderBy(String field, boolean ascOrDesc) {
        assertObjectNotNull("field", field);
        if (fieldSortBuilderList == null) {

* ACTION REQUIRED: The Node.Status.Volumes.Attached.DevicePath field is now unset for CSI volumes. Update any external controllers that depend on this field. ([#75799](https://github.com/kubernetes/kubernetes/pull/75799), [@msau42](https://github.com/msau42))...

                        ProjectDependencyGraphStub.Z),
                currentProjects);
    }

    static void set(Object obj, String field, Object v) throws NoSuchFieldException, IllegalAccessException {
        Field f = obj.getClass().getDeclaredField(field);
        f.setAccessible(true);
        f.set(obj, v);
    }

    protected int handleReconnectRetries = 3;
    /** Directory to store persistent handle state */
    protected String handleStateDirectory;

    // Directory leasing configuration fields
    /**
     * Whether to use directory leasing for cached directory listings
     */
    protected boolean useDirectoryLeasing = true;
    /**

from fastapi import FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel, Field

app = FastAPI()


class ResponseModel(BaseModel):
    code: int = 200
    message: str = Field(default_factory=lambda: "Successful operation.")


@app.get(
    "/response_model_has_default_factory_return_dict",
    response_model=ResponseModel,
)
async def response_model_has_default_factory_return_dict():