Database Routing by URL
An example of how to select the "default" database based on the request URL instead of the model. The basic idea is that the middleware `process_view` (or `process_request`) function sets some context from the URL into thread local storage, and `process_response` deletes it. In between, any database operation will call the router, which checks for this context and returns an appropriate database alias. In this snippet, it's assumed that any view in the system with a `cfg` keyword argument passed to it from the urlconf may be routed to a separate database. Take this urlconf for example: `url( r'^(?P<cfg>\w+)/account/$', 'views.account' )` The middleware and router will select a database whose alias is `<cfg>`, or "default" if none is listed in `settings.DATABASES`, all completely transparent to the view itself.
- multidb database router url