<description>Dependency collection or resolution injection.</description>
      <fields>
        <field>
          <name>field</name>
          <required>false</required>
          <version>2.0.0+</version>
          <type>String</type>
          <description>the name of the field to be injected</description>
        </field>
        <field>
          <name>pathScope</name>
          <required>false</required>

client = TestClient(app)


def test_dependency_contextvars():
    """
    Check that custom middlewares don't affect the contextvar context for dependencies.

    The code before yield and the code after yield should be run in the same contextvar
    context, so that request_state_context_var.reset(contextvar_token).

    If they are run in a different context, that raises an error.
    """

Das Erste, was auffällt, ist, dass wir eine asynchrone Funktion mit `yield` definieren. Das ist sehr ähnlich zu Abhängigkeiten mit `yield`.

{* ../../docs_src/events/tutorial003_py310.py hl[14:19] *}

Der erste Teil der Funktion, vor dem `yield`, wird ausgeführt **bevor** die Anwendung startet.

Und der Teil nach `yield` wird ausgeführt, **nachdem** die Anwendung beendet ist.

    pass


async def asyncgen_state(state: dict[str, str] = Depends(get_state)):
    state["/async"] = "asyncgen started"
    yield state["/async"]
    state["/async"] = "asyncgen completed"


def generator_state(state: dict[str, str] = Depends(get_state)):
    state["/sync"] = "generator started"
    yield state["/sync"]
    state["/sync"] = "generator completed"

FastAPI ile SSE akışı yapmak için, *path operation function* içinde `yield` kullanın ve `response_class=EventSourceResponse` olarak ayarlayın.

`EventSourceResponse`'u `fastapi.sse` içinden içe aktarın:

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[1:25] hl[4,22] *}

Yield edilen her öğe JSON olarak kodlanır ve bir SSE olayının `data:` alanında gönderilir.

## Стриминг SSE с FastAPI { #stream-sse-with-fastapi }

Чтобы стримить SSE с FastAPI, используйте `yield` в своей функции-обработчике пути и укажите `response_class=EventSourceResponse`.

Импортируйте `EventSourceResponse` из `fastapi.sse`:

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[1:25] hl[4,22] *}

Каждый возвращаемый через `yield` элемент кодируется как JSON и отправляется в поле `data:` события SSE.

        // Use reflection to access and verify protected fields from the parent class DcerpcMessage
        Field ptypeField = DcerpcMessage.class.getDeclaredField("ptype");
        ptypeField.setAccessible(true);
        int ptypeValue = (int) ptypeField.get(request);
        assertEquals(0, ptypeValue, "The 'ptype' field should be initialized to 0.");

     */
    public String sort;

    /**
     * The language setting for error page display.
     */
    public String lang;

    /**
     * Additional search fields for error page display.
     */
    public Map<String, String[]> fields = new HashMap<>();

    /**
     * Default constructor for ThumbnailForm.
     */
    public ThumbnailForm() {
        // Default constructor
    }

		h.Mode |= c_ISGID
	}
	if fm&fs.ModeSticky != 0 {
		h.Mode |= c_ISVTX
	}
	// If possible, populate additional fields from OS-specific
	// FileInfo fields.
	if sys, ok := fi.Sys().(*Header); ok {
		// This FileInfo came from a Header (not the OS). Use the
		// original Header to populate all remaining fields.
		h.Uid = sys.Uid
		h.Gid = sys.Gid
		h.Uname = sys.Uname
		h.Gname = sys.Gname
		h.AccessTime = sys.AccessTime

from sqlmodel import Field, Session, SQLModel, create_engine

engine = create_engine("postgresql+psycopg://postgres:postgres@localhost/db")


class User(SQLModel, table=True):
    id: int | None = Field(default=None, primary_key=True)
    name: str


app = FastAPI()


def get_session():
    with Session(engine) as session:
        yield session