How to split a Sinatra app with different scopes?

Question

I'm splitting a large Sinatra file into different files using registers. This is one way to have a modular Sinatra app using extensions.

I'm ending up with something like the following code:

MyApp < Sinatra::Base register OneRegister register SecondRegister end

module OneRegister def self.registered(app) app.helpers OneRegisterHelper app.get "/one-endpoint" do do_stuff end end module OneRegisterHelper def do_stuff # Some code end end end

module SecondRegister def self.registered(app) app.helpers SecondRegisterHelper app.get "/second-endpoint" do do_stuff end end module SecondRegisterHelper def do_stuff # Different code end end end

The problem is how Sinatra works with registers and helpers. Every time I create a new helper for a register I'm polluting the main Sinatra app scope with the methods in the helpers.

So, the method do_stuff is going to be overwritten by the SecondRegisterHelper (this is how Ruby works when including a module) but I'd like to have different implementations for the methods without worry if I'm using the same method name or a different one (image an app with 25 registers with small methods in each one).

Basically, I'd like to have different registers with private methods because I usually write very small private methods with a single responsibility. Any ideas, how I can achieve this?

Lars Vonk · Accepted Answer · 2017-01-10 20:13:52Z

I don't think this is achievable in the way you are trying. If you have methods with similar names in different modules mixed into a single class the last just wins.

So in this case I would create a modular app combined with a config.ru to setup your application.

class OneRegister < Sinatra::Base # helpers here end class SecondRegister < Sinatra::Base # helpers here end

In config.ru

app = Rack::URLMap.new( '/one-endpoint' => OneRegister, '/second-endpoint' => TwoRegister ) run app

No you helpers are scoped to a single class.

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