Ability to add sub router to application router

[Gr1N]

Long story short

This proposal is about how to improve actual router to add possibility to include sub routers into main application router.

I big projects we want so split functionality into modules, e.g. module for users, module for news, etc. And each module can contains views, helpers, db tables, etc; and if module contains views we want to put routes in this module too. And for now there are no useful way to do it.

Expected behaviour

For example we have a project:

/users
   views.py
   router.py
/news
   views.py
   routes.py
main.py
routes.py

In top level router I just want something like this:

# routes.py
from users.routes import router as users_router
from news.routes import router as news_router

router = UrlDispatcher()
router.add_subrouter('/users', users_router, name_or_namespace='users')
router.add_subrouter('/news', news_router, name_or_namespace='news')

# main.py
from routes import router
app = Application(router=router)
...

In this case I don't want to create additional apps (using realization #1301) for news and users modules, because I don't need additional middlewares or signals, I just want to include routes.

[fafhrd91]

you can use UrlDispatcher.register_resource. added in 3de9604

you'll need some variation of PrefixedSubAppResource but without app, would you like to provide PR?

[lock]

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