Bayan Depends na asali, jijiyar dogondiya na FastAPI tana goyo ƙimantattun tsarin: sub-dependencies, dependencies tare da sifofi (tushen aji ko ta hanyar masana'antu), allunan dabaɓɓu (yield), , da don gwaji — wanda ya sanya shi kayan aiki masu ban abu don tsara aikace-aikace na gaida.
def get_token(authorization: str = Header()):
return parse(authorization)
def get_current_user(token: str = Depends(get_token)): # depends on another dependency
return decode(token)
def get_admin(user: User = Depends(get_current_user)): # depends on that, in turn
if not user.is_admin: raise HTTPException(403)
return user
# FastAPI resolves the whole chain, caching shared dependencies within a request
Dogondiya na iya dogon dogondiya na ɗan ƙara, da ke samar da bishiya FastAPI ɗin kwankwaso ta atomatik (da jera waɗanda ke tattare dasu a baje ƴi, don haka get_token yana gudu sau ɗaya duni ko da aka yi amfani ta tare da dogondiya da dama).
class RateLimiter:
def __init__(self, calls: int): # configure the dependency
self.calls = calls
def __call__(self, request: Request): # callable → acts as a dependency
check_rate_limit(request, self.calls)
@app.get("/items", dependencies=[Depends(RateLimiter(calls=100))]) # configured per route
def items(): ...
Aji tare da __call__ shi ne dogondiya da za a iya daidaita — kuna shimfiɗa shi a lokacin amfani (misali rate limits daban-daban a hanyoyi daban-daban).
@app.get("/admin", dependencies=[Depends(verify_admin)]) # run for the effect (auth check)
def admin(): ... # don't need its return value
app = FastAPI(dependencies=[Depends(verify_api_key)]) # applies to EVERY route
router = APIRouter(dependencies=[Depends(get_current_user)]) # to all routes in a router
Daukar dogondiya kawo-kawo ko kuma a kowane router don bukatuwan shingizawa (authentication, rate limiting).
app.dependency_overrides[get_db] = get_test_db # swap any dependency in tests
Jijiyar dogondiya na FastAPI ita ce ɗaya daga cikin abubuwan masu karfi sosai, da ƙimantattun tsarin nan ne suka bar ku hayin daidaita aikace-aikace masu rikitarwa da haɗaka. Fahimta waɗannan tana da muhimmanci babbar mataki: sub-dependencies suna gina maɓuginu masu amfani (token → mai amfani → admin) tare da atomatik na warwarewa da jera a baje ƴi (gaje mula aikiyi na waje); parameterized/class-based dependencies suna aiki ƙomai-ƙomai, abubuwan da za a iya daidaita (masu ajiye ma'auratar daji, bincikan izini tare da saitin daban-daban a kowane hanya); dogondiya a matsayin tasirin gida suna aiwatar da bukatuwa cikakke (authentication) ba tare da ɓigon sa ilma kaɗan ba; da global/router-level dependencies suna daukar matakan shingizawa (authentication, rate limiting) ga rukuni na auzare a wuri ɗaya. "]}}{
Ɗakin karatu na tambayoyin hira na IT tare da amsoshi cikakke — daga Junior zuwa Senior.
Ba da Gudummawa