Parameterized Dependencies
Create dependencies that accept arguments:
from justapi import JustAPIApp, Depends
def get_query_filter(field: str, value: str):
def dependency():
return {field: value}
return dependency
app = JustAPIApp()
@app.get("/items/")
def list_items(fresh: str = Depends(get_query_filter("status", "active"))):
return {"filter": fresh}
Dependency Overrides
Override dependencies for testing:
def get_db():
return ProductionDB()
app = JustAPIApp(dependencies=[Depends(get_db)])
# In tests
def override_get_db():
return TestDB()
app.dependency_overrides[get_db] = override_get_db
def test_handler():
response = client.get("/items/")
assert response.status == 200
Async Generator Dependencies
async def get_async_db():
db = await create_async_connection()
try:
yield db
finally:
await db.close()
@app.get("/items/")
async def list_items(db = Depends(get_async_db)):
items = await db.fetch_all("SELECT * FROM items")
return {"items": items}
See Also
- Dependencies with yield — cleanup patterns
- Testing with Overrides — testing dependencies
- Classes as Dependencies — class-based deps