Unexpected ordering between prefix and mount point

[wagenet]

class API < Grape::API
  prefix 'api'
  format :json
  mount Acme::Ping => 'foo'
  mount Acme::Raise
  mount Acme::Protected
  mount Acme::Post
end

This generates a url like /foo/api. I'd expect the prefix to take precedence over the mount point and give me /api/foo. If this is intentional, please disregard.

[dblock]

I don't think this was intentional, looks like a bug.

[trico]

I think it is intentional
https://github.com/intridea/grape/blob/032b20ee743ab42e1209276fab02c7a845d61ef5/spec/grape/path_spec.rb#L148

[dblock]

I guess this could make sense, but still seems backwards to me. I'll leave this open, it would be good to at least document the gotcha?

[wagenet]

I think if the prefix is in the module being mounted it should come afterwards, i.e. API has a prefix and is mounted at some location, the mount point should clearly come first. However, if something is mounted into a location that already has a prefix then the ordering definitely seems wrong. I could easily see someone getting these two scenarios confused when writing a test and accidentally testing for the wrong one.