fastapi-di-chain

Chain FastAPI dependencies without unused Depends!

Overview

fastapi-di-chain provides a utility to chain FastAPI dependencies in a way that avoids unused Depends parameters, making your dependency injection cleaner, more maintainable and easier to integrade.

Installation

pip install fastapi-di-chain

Usage

Suppose you have several dependencies that you want to chain together:

from fastapi import FastAPI, Depends
from fastapi_di_chain import DependsChain

app = FastAPI()

def my_rate_limiting_dependency() -> None:
    # e.g. checks rate limiting
    pass

def my_authentication_dependency() -> None:
    # e.g. checks that user is authenticated to do a request
    pass

dependency_chain = DependsChain | my_rate_limiting_dependency | my_authentication_dependency

@app.get("/profile", dependencies=[dependency_chain])
def profile() -> dict:
    return {"user": 123}

License

fastapi-di-chain is distributed under the terms of the MIT license. Please see License.md for more information.