socialforge/app/api/mobile/entities/exercise.rb

module Mobile
  module Entities
    class Exercise < Grape::Entity
      include Redmine::I18n
      include ApplicationHelper
      include ApiHelper
      def self.exercise_expose(field)
        expose field do |f,opt|
          if f.is_a?(Hash) && f.key?(field)
            if field == :created_on
              format_time(f[field])
            else
              f[field]
            end
          elsif f.is_a?(::Exercise)
            if f.respond_to?(field)
              f.send(field)
            else
              case field
                when :coursename
                  f.course.nil? ? "" : f.course.name
                when :syllabus_title
                  f.course.nil? ? "" : f.course.syllabus.nil? ? "" : f.course.syllabus.title
              end
            end
          end
        end
      end
      expose :exercise_name
      expose :exercise_description
      exercise_expose :coursename #所属班级名
      exercise_expose :syllabus_title

      expose :current_user_is_teacher, if: lambda { |instance, options| options[:user] } do |instance, options|
        current_user = options[:user]
        current_user_is_teacher = false
        current_user_is_teacher = is_course_teacher(current_user,instance.course)
        current_user_is_teacher
      end

    end
  end
end