trustieforge/app/api/mobile/apis/blog_comments.rb

#coding=utf-8

module Mobile
  module Apis
    class BlogComments< Grape::API
      resources :blog_comments do

        desc "get special topic"
        get ':id' do
          user = current_user
          blog = BlogComment.find params[:id]
          present :data, blog, with: Mobile::Entities::BlogComment,user: user
          present :status, 0
        end
      end
    end
  end
end