socialforge/app/api/mobile/apis/activities.rb

#coding=utf-8

module Mobile
  module Apis
    class Activities< Grape::API
      resources :activities do

        desc "get user activities"
        get ':id' do
          #uw = UserWechat.find params[:openid]
          user = User.find params[:id]
          shield_project_ids = ShieldActivity.where("container_type='User' and container_id=#{user.id} and shield_type='Project'").map(&:shield_id)
          shield_course_ids = ShieldActivity.where("container_type='User' and container_id=#{user.id} and shield_type='Course'").map(&:shield_id)
          page = params[:page] ? params[:page].to_i + 1 : 0
          user_project_ids = (user.projects.visible.map{|project| project.id}-shield_project_ids).empty? ? "(-1)" : "(" + (user.projects.visible.map{|project| project.id}-shield_project_ids).join(",") + ")"
          user_course_ids = (user.courses.visible.map{|course| course.id}-shield_course_ids).empty? ? "(-1)" : "(" + (user.courses.visible.map{|course| course.id}-shield_course_ids).join(",") + ")"
          course_types = "('Message','News','HomeworkCommon','Poll','Course')"
          project_types = "('Message','Issue','ProjectCreateInfo')"
          principal_types = "JournalsForMessage"

          blog_ids = "("+user.blog.id.to_s+","+((User.watched_by(user.id).count == 0 )? '0' :User.watched_by(user.id).map{|u| u.blog.id}.join(','))+")"
          activities = UserActivity.where("(container_type = 'Project' and container_id in #{user_project_ids} and act_type in #{project_types})" +
                                              "or (container_type = 'Course' and container_id in #{user_course_ids} and act_type in #{course_types}) "+
                                              "or (container_type = 'Principal' and act_type= '#{principal_types}' and container_id = #{user.id}) " +
                                              "or (container_type = 'Blog' and act_type= 'BlogComment' and container_id in #{blog_ids})").order('updated_at desc').limit(50).offset(page * 10)
          present :data, activities, with: Mobile::Entities::Activity
          present :status, 0
        end
      end
    end
  end
end