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PacktPublishing / Python-Web-Development-with-Sanic

Python Web Development with Sanic, published by Packt
MIT License
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Chapter02 Sanic Generates Error When Trying to Run src.server:app #11

Closed TheGeolama closed 2 years ago

TheGeolama commented 2 years ago

sanic is installed in a virutalenv. Within the Chapter02/booktracker folder, I issue this command at the Windows Command prompt:

sanic src.server:app -p 7777 --debug --workers=2

I get this traceback:

Traceback (most recent call last): File "C:\Program Files\Python310\lib\runpy.py", line 196, in _run_module_as_main return _run_code(code, main_globals, None, File "C:\Program Files\Python310\lib\runpy.py", line 86, in _run_code exec(code, run_globals) File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\Scripts\sanic.exe__main.py", line 7, in File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\lib\site-packages\sanic\main.py", line 12, in main cli.run() File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\lib\site-packages\sanic\cli\app.py", line 82, in run app = self._get_app() File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\lib\site-packages\sanic\cli\app.py", line 135, in _get_app module = import_module(module_name) File "C:\Program Files\Python310\lib\importlib\init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "", line 1050, in _gcd_import File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "", line 883, in exec_module File "", line 241, in _call_with_frames_removed File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\Chapter02\booktracker\src\server.py", line 4, in app = create_app() File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\Chapter02\booktracker\src\utilities\app_factory.py", line 22, in create_app autodiscover(app, *init_blueprints) File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\Chapter02\booktracker\src\utilities\autodiscovery.py", line 28, in autodiscover app.blueprint(bp) File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\lib\site-packages\sanic\app.py", line 527, in blueprint blueprint.register(self, options) File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\lib\site-packages\sanic\blueprints.py", line 357, in register route = app._apply_route(apply_route) File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\lib\site-packages\sanic\app.py", line 393, in _apply_route routes = self.router.add(params) File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\lib\site-packages\sanic\router.py", line 137, in add route = super().add(params) # type: ignore File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\lib\site-packages\sanic_routing\router.py", line 243, in add group.merge(existing_group, overwrite, append) File "D:\Development\PyCharmProjects\Python-Web-Development-with-Sanic-main\venv\lib\site-packages\sanic_routing\group.py", line 160, in merge raise RouteExists( sanic_routing.exceptions.RouteExists: Route already registered: book [GET]

ahopkins commented 2 years ago

Thanks for bringing this up! This looks like it is the result of a change between v21.3 and v21.6 (when the chapter was written). Basically what is happening is the autodiscover is trying to load both the Blueprint and the BlueprintGroup.

I will get a correction for this up probably later today.

TheGeolama commented 2 years ago

Still working on a fix for this?

ahopkins commented 2 years ago

I just pushed a fix. In short, before we add the BlueprintGroup, we make sure to filter out any blueprints attached to it.

ahopkins commented 2 years ago

Please keep me informed of any more challenges you see. :heart: