trustieforge/app/caches/user_cache.rb

class UserCache
  class<<self

    def user_cache(id)
      key = "user:"+id.to_s
      data = Rails.cache.read(key)
      if data.nil?
        #直接存数据库对象
        data = User.find(id) rescue nil
        if data
          Rails.cache.write(key,data)
        end
      end
      data
    end

    #更新
    def update_user_cache(id,user)
      key = "user:"+id.to_s
      data = Rails.cache.read(key)
      if data.nil?
        #直接存数据库对象
        data = User.find(id) rescue nil
        if data
          Rails.cache.write(key,data)
        end
      else
        Rails.cache.write(key,user)
      end
    end

    #-----------------------------收藏的班级
    def user_favorite_courses_cache(user_id)
      key = "user_favorite_courses:"+user_id.to_s
      data = Rails.cache.read(key)
      if data.nil?
        data = []
        user = User.find(user_id)
        courses = user.favorite_courses.visible.where("is_delete =?", 0).select("courses.*,(SELECT MAX(updated_at)  FROM `course_activities` WHERE course_activities.course_id = courses.id) AS a").order("a desc")
        courses.each do |course|
          data << {
              :id=>course.id,
              #:updated_at=>course.a
          }
        end

        Rails.cache.write(key,data)
      end
      data
    end

    #更新
    def update_user_favorite_courses_cache(user_id,course_id,type)
      key = "user_favorite_courses:"+user_id.to_s
      data = Rails.cache.read(key)
      if data.nil?
        # data = []
        # user = User.find(user_id)
        # courses = user.favorite_courses.visible.where("is_delete =?", 0).select("courses.*,(SELECT MAX(updated_at)  FROM `course_activities` WHERE course_activities.course_id = courses.id) AS a").order("a desc")
        # courses.each do |course|
        #   data << {
        #       :id=>course.id,
        #       #:updated_at=>course.a
        #   }
        # end
        #
        # Rails.cache.write(key,data)
      else
        if type ==0
          #增加
          data << {
              :id=>course_id,
              #:updated_at=>info.updated_at
          }
        elsif type == 1
          #删除
          data.each do |course|
            if course[:id] == course_id
              data.delete(course)
              break
            end
          end
        else
            # data.each_with_index do |course,index|
            #   if course[:id] == course_id
            #     data[index] = data[index].merge(opt)
            #     break
            #   end
            # end
        end

        Rails.cache.write(key,data)
      end
    end

    #-----------------------------收藏的项目
    def user_favorite_projects_cache(user_id)
      key = "user_favorite_projects:"+user_id.to_s
      data = Rails.cache.read(key)
      if data.nil?
        data = []
        user = User.find(user_id)
        projects = user.favorite_projects.visible.select("projects.*, (SELECT MAX(updated_at)  FROM `forge_activities` WHERE forge_activities.project_id = projects.id) AS a").order("a desc")
        projects.each do |project|
          data << {
              :id=>project.id,
              #:updated_at=>project.a
          }
        end

        Rails.cache.write(key,data)
      end
      data
    end

    #更新
    def update_user_favorite_projects_cache(user_id,project_id,type,opt={})
      key = "user_favorite_projects:"+user_id.to_s
      data = Rails.cache.read(key)
      if data.nil?
        # data = []
        # user = User.find(user_id)
        # projects = user.favorite_projects.visible.select("projects.*, (SELECT MAX(updated_at)  FROM `forge_activities` WHERE forge_activities.project_id = projects.id) AS a").order("a desc")
        # projects.each do |project|
        #   data << {
        #       :id=>project.id,
        #       #:updated_at=>project.a
        #   }
        # end
        #
        # Rails.cache.write(key,data)
      else
        if type == 0
          #增加
          data << {
              :id=>project_id,
              #:updated_at=>info.updated_at
          }
        elsif type == 1
          #删除
          data.each do |project|
            if project[:id] == project_id
              data.delete(project)
              break
            end
          end

        else
          # data.each_with_index do |project,index|
          #   if project[:id] == project_id
          #     data[index] = data[index].merge(opt)
          #     break
          #   end
          # end
        end
        Rails.cache.write(key,data)
      end
    end

  end
end