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Showing content from https://github.com/sinatra/sinatra/issues/1361 below:

Nested namespace with optional url parts do not work in sinatra => 2.0 · Issue #1361 · sinatra/sinatra · GitHub

Hi,

I have the following app (which worked in sinatra < 2.0):

class App < Sinatra::Base
  register Sinatra::Namespace

  namespace '/foo/:year/?:period?' do
    get '/status' do
      status 200
    end

    namespace '/nested' do
      get '/1' do
        this_method_does_not_exist('hello')
        status 200
      end

      helpers do
        def this_method_does_not_exist(msg)
          puts "hello #{msg}"
        end
      end
    end
  end
end

When I call /foo/2018/2/nested/1 all works as expected. When I call /foo/2018/nested/1 it results in a

NoMethodError: undefined method `this_method_does_not_exist`

Duplicating the outer namespace "resolves" the issue:

class App < Sinatra::Base
  register Sinatra::Namespace

  namespace '/foo/:year/?:period?' do
    get '/status' do
      status 200
    end
  end
  
  namespace '/foo/:year/?:period?/nested' do
    get '/1' do
      this_method_does_not_exist('hello')
      status 200
    end

    helpers do
      def this_method_does_not_exist(msg)
        puts "hello #{msg}"
      end
    end
  end

end

Full test case can be found here: https://github.com/lvonk/sinatra-namespaces-issue

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