python flask-restful blueprint and factory pattern work together?

Flask-Restful, like all properly implemented Flask extensions, supports two methods of registering itself:

1. With the app at instantiation (as you are trying to do with Api(current_app))
2. At a later point using api.init_app(app)

The canonical way of dealing with the circular imports issue is to use the second pattern and import the instantiated extension in your create_app function and register the extension using the init_app method:

# app/resource/__init__.pyfrom resource.hello_world import HelloWorldapi = restful.Api(prefix='/api/v1')  # Note, no appapi.add_resource(HelloWorld, '/hello')# We could actually register our API on a blueprint# and then import and register the blueprint as normal# but that's an alternate we will leave for another day# bp = Blueprint('resource', __name__, url_prefix='/api')# api.init_app(bp)

And then in your create_app call you would simply load and register the api:

def create_app():    # ... snip ...    # We import our extension    # and register it with our application    # without any circular references    # Our handlers can use `current_app`, as you already know    from app.resource import api    api.init_app(app)