Allow multiple mounts of the same API class

[USvER]

So i have Assets and have many other models that has many Assets.
How do i expose this in API using grape?
For now i'm duplicating Assest class that is exposing Assets resource... But it's not DRY...
I have many relations... and my current project starts to look like copy-paste shit.

I want to have one class that exposes Assets resource no matter on wich level it is (as top level resource or nested). But when i mount that class twice, only last mounted resource works.

Thank you.

[USvER]

Quick and dirty fix is to load and evaluate same code in the different places

eval(IO.read(Rails.root.join('app', 'api', 'v1', 'mixins', 'assets.rb')))

I'm new to ruby, so maybe my solution is ugly... best i could think of...

[dblock]

I'd like to be able to allow multiple mounts at different places and levels. So lets rename this into a feature request.

[USvER]

That would be nice!
Eval works... but debuging is hard...

[hobofan]

We added a small bounty for this issue on bountysource.

[codenamev]

How would this be different than Modules? Can you provide a working example?

[hobofan]

The Modules section describes how you can mount multiple APIs in the same/different paths.

The problem is that if you mount the same API (e.g. Twitter::APIv2) inside different APIs (e.g Twitter::API and AllAPIs::API) the paths etc. of the first time it is mounted will be overwritten which will result in the API being mounted twice at the same location.

[dblock]

@hobofan I think you could write a failing spec for this. Would be greatly appreciated.

[dspaeth-faber]

The issue arises within Grape::API#mount. There is :mount_path set on class level for the API-Class. With this information route.route_compiled will be created later (some how) and this is always the same (because it uses the class level settings). I think that's no easy fix.

My workaround would be:

module APILogic
  def self.included(base)
    base.instance_eval do
      desc "Return a personal timeline."
      get :home_timeline do
        authenticate!
        current_user.statuses.limit(20)
      end
    end
  end
end

class API1 < Grape::API
  include APILogic
end

class API2 < Grape::API
  include APILogic
end


class Twitter::API < Grape::API
  mount API1 => '/mounted'
  mount API2 => '/double'
end

[lasseebert]

The behavior achieved by @dspaeth-faber's example is the expected behavior, and should be default. I can't see an easy fix for this, but two possible fixes could be:

• Don't have static config (class level config) on api classes. This is probably a major refactoring.
• Somehow clone the class when mounting, so that only a copy of the class is mounted. This is not trivial, but my guess is that it is an easier fix.