在切片查询集时无法唯一地获取django过滤的对象

I am working on item display page of an e commerce site. So suppose the site has 10 items, now I need to fetch 2 items each time and we need to fetch the item using the last_index and last_price of the 2nd element fetched before. So the JSON to fetch the record is like thisI am working on item display page of an e comme