trustieforge/app/caches/praise_cache.rb

#资源缓存
class PraiseCache
  class << self
    #------------帖子赞数缓存---------------------
    def praise_cache(object_id,object_type)
      object_type = object_type.to_s
      key = 'praise:'+object_type+":"+object_id.to_s
      data = Rails.cache.read(key)
      if data.nil?
        data = {}
        praise = PraiseTreadCache.where("object_id=#{object_id} and object_type='#{object_type}'").first
        praise_num = praise.nil? ? 0 : praise.praise_num
        data = {
              :object_id=>object_id,
              :object_type=>object_type,
              :praise_num=>praise_num
        }
        Rails.cache.write(key,data)
      end
      data
    end

    def update_praise_cache(object_id,object_type,opt={})
      object_type = object_type.to_s
      key = 'praise:'+object_type+":"+object_id.to_s
      data = Rails.cache.read(key)
      if data.nil?
        # data = {}
        # praise = PraiseTreadCache.where("object_id=#{object_id} and object_type='#{object_type}'")
        # praise_num = praise.nil? ? 0 : praise.praise_num
        # data = {
        #     :object_id=>object_id,
        #     :object_type=>object_type,
        #     :praise_num=>praise_num
        # }
        # Rails.cache.write(key,data)
      else
        data = data.merge(opt)
        Rails.cache.write(key,data)
      end
    end

    #------------帖子已赞、未赞缓存---------------------
    def ispraise_cache(user_id,object_id,object_type)
      object_type = object_type.to_s
      key = 'ispraise:'+object_type+":"+object_id.to_s+":"+user_id.to_s
      data = Rails.cache.read(key)
      if data.nil?
        data = false
        unless PraiseTread.where(praise_tread_object_id: object_id,praise_tread_object_type: object_type,user_id: user_id).empty?
          data = true
        end
        Rails.cache.write(key,data)
      end
      data
    end

    def update_ispraise_cache(user_id,object_id,object_type,flag)
      object_type = object_type.to_s
      key = 'ispraise:'+object_type+":"+object_id.to_s+":"+user_id.to_s
      Rails.cache.write(key,flag)
    end

  end
end