fastapi-better-di
What is this ?
fastapi-better-di is a utility that allows you to use DI in fastapi without Depends()
Installation
pip install fastapi_better_di
Examples
# app.py
import uvicorn
from fastapi import FastAPI
from fastapi_better_di.patcher.auto import is_pathed
# functions were patched immediately after import
assert is_pathed(), "Something went wrong"
class MyType:
def __init__(self, value):
self.value = value
app = FastAPI()
app.dependency_overrides[MyType] = lambda: MyType(123)
@app.get("/")
def handler(my_type: MyType): # <- DI without `Depends()`
assert my_type.value == 123
return my_type
if __name__ == "__main__":
uvicorn.run(app)
Usage
- Patching:
-
Auto patching: patches classes when importing:
from fastapi_better_di.patcher.auto import is_pathed # The classes were patched immediately after import # To check if everything is OK, use assert assert is_pathed(), "Something went wrong"
-
Manual patching: you need to call
patch()by yourself:from fastapi_better_di.patcher.manual import patch, is_pathed patch() # To check if everything is OK, use assert assert is_pathed(), "Something went wrong"
-
-
IMPORTANT: You can still use
= Depends()without a function as an argument, and it won't add unnecessary arguments to the swagger.- Related issue: fastapi issue
-
IMPORTANT: The main app(
FastAPI) anddependency_overridesmust be initialized before importing routers!
How it works
fastapi-better-di simply patch the handler function and add = Depends(func) as the default argument
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