This can be considered chore/feature.
As of now, Rails middlewares are unusable outside of a Rails app. I've been
trying to use Rack::URLMap to map subpaths to different apps:
# config.ru
app = Rack::URLMap.new(
"/" => Rails.application,
"/api" => App::API
)
run app
this works, but I lose all the middlewares of the rails app, one of them
being the authentication layer, which is handled by devise.
so I went further and have been trying to do something like this:
class CustomBuilder < Rack::Builder
def call(env)
req = Rails.application.send(:build_request, env)
super(req.env)
endend
api = CustomBuilder.new do
run App::APIend
# ugly, but rack doesn't allow me anything else
api.instance_variable_get(:@use, Rack.application.config.middleware)
app = Rack::URLMap.new(
"/" => Rails.application,
"/api" => api
This will break, because Rack::Builder#to_app requires the middleware to be
reversable
<https://github.com/rack/rack/blob/master/lib/rack/builder.rb#L147>. From
the same link, you can see that the middleware must respond to [].
The first approach seems to be to implement
ActionDispatch::MiddlewareStack#reverse (it is an Enumerable, not an
Array), and to implement ActionDispatch::MiddlewareStack::Middleware#[](could
be a simple alias to ActionDispatch::MiddlewareStack::Middleware#build).
The #reverseimplementation is however "dangerous", because it means that
existing #use calls which do global mutation will be executed as many times
as the number of apps mapped in my Rack::URLMap app. This is why this would
break <https://github.com/plataformatec/devise/issues/4291>, but then
again, the requirement is from rack, so maybe this could be deviced there.
Rails version:
5.0.0.1
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