Help please. I'm not getting the correct way to do the wiring

I am trying to use wiring into my fastapi project. This is my file layout

micro_servicio
├── adapters
│   ├── db
│   │   └── __init__.py
│   ├── __init__.py
│   └── web
│       ├── app.py
│       ├── __init__.py
│       └── routers
│           ├── __init__.py
│           └── test.py
├── core
│   ├── acciones
│   │   └── __init__.py
│   └── __init__.py
├── __init__.py
└── run.py

I have my business logic in core package and use the adapters packages to connect de core with the exterior, like an hexagonal architecture.

run.py

import uvicorn
# from micro_servicio.adapters.web import app


if __name__ == "__main__":
    uvicorn.run("micro_servicio.adapters.web.app:app", host="0.0.0.0", port=8001, reload=True, log_level='debug')

micro_servicio.core.init.py

from dependency_injector import containers, providers
from micro_servicio.core.acciones import Acciones


class Container(containers.DeclarativeContainer):
    # wiring_config = containers.WiringConfiguration(modules=[Acciones]) <---- does not work either
    config = providers.Configuration()
    acciones = providers.Factory(Acciones)

micro_servicio.core.acciones.init.py

class Acciones:
    def __init__(self):
        pass

    def accion_uno(self, param1: int, param2: str) -> str:
        return {'msg': '{}, {} veces!!!'.format(param2, param1)}

micro_servicio.adapters.web.app.py

"""Application module."""

from fastapi import FastAPI
from dependency_injector.wiring import register_loader_containers
from micro_servicio.core import Container
from micro_servicio.core.acciones import Acciones
from micro_servicio.adapters.web.routers.test import router as r_test


def create_app() -> FastAPI:
    container = Container()
    # register_loader_containers(container) <---- does not work either
    container.wire(modules=[Acciones])

    app = FastAPI(debug=True, title='Esto es una prueba')
    app.container = container
    app.include_router(r_test)
    return app


app = create_app()

micro_servicio.adapters.web.routers.test.py

from typing import Optional, List
from fastapi import APIRouter, Depends, Response, status
from dependency_injector.wiring import inject, Provide
from micro_servicio.core.acciones import Acciones
from micro_servicio.core import Container

router = APIRouter()


@router.get("/")
async def index():
    print("llegue hasta el router index endpoint")
    return {'msg': 'Hola mundo'}


@router.get("/test")
@inject
async def index(
    acciones: Acciones = Depends(Provide[Container.acciones])
):
    print("llegue hasta el router test endpoint")
    return acciones.accion_uno(4, "hola")   # This returns AttributeError: 'Provide' object has no attribute 'accion_uno'
   

No matter what method I use to do the wiring the only way I get it work is this:

return acciones.provider().accion_uno(4, "hola")

What I am doing wrong???

Thanks in advance Nomar Mora

[danodic]

Hello, just would like to mention that I have been facing the same issue. The version of the lib I am using is 4.39.1.

I have followed the instructions exactly as mentioned at https://python-dependency-injector.ets-labs.org/examples/fastapi.html but I was still getting the error. Instead of providing the dependency, it provides an instance of the Provide marker when my route is called.

After some investigation, I was able to find that I could do the wiring manually as mentioned in the wiring docs as follows;

from fastapi import FastAPI

from application.deps import DependencyContainer
from application.routes.content import content_router


def get_app() -> FastAPI:
    app = FastAPI()
    app.include_router(content_router)

    # The manual wiring saved the day :)
    DependencyContainer().wire(modules=['application.routes.content'])

    return app

That solved the issue. Setting the WiringConfiguration inside my container did not change anything.

I was not able to find what would be the fix, but I hope that helps finding a solution.

[kalimalrazif]

Thanks @danodic! Thank you so much!

I misunderstood what I should put in the wiring configuration!

I reread everything and now it worked for me!!!