trustieforge/app/api/mobile/entities/comment.rb

module Mobile
  module Entities
    class Comment < Grape::Entity
      include Redmine::I18n
      def self.comment_expose(field)
        expose field do |f,opt|
          if f.is_a?(Hash) && f.key?(field)
            f[field]
          elsif f.is_a?(::Comment)
            if f.respond_to?(field)
              if field == :created_on
                time_from_now(f.send(field))
              else
                f.send(field)
              end
            end
          end
        end
      end
      comment_expose :id
      expose :author, using: Mobile::Entities::User do |c, opt|
        if c.is_a? ::Comment
          c.author
        end
      end
      comment_expose :comments
      comment_expose :created_on
    end
  end
end