Sinatra datamapper 从某个条目中提取信息
我是 Sinatra 的新手，我想为移动应用程序创建一项服务。我创建了一个小项目，将条目记录到数据映射器中，并且能够提取所有信息并返回 json 对象。问题是，当您向数据库中添加更多数据时，响应会变得更大，并且需要一段时间才能在移动设备上下载。所以我想以不同的方式提取数据，通过给它序列号，我想只根据completed_at时间提取接下来的10个条目（见下文）。
class NewsObject include DataMapper::Resource property :id, Serial property :title, String property :completed_at, DateTime, :default => DateTime.now end
到目前为止，我设法以正确的顺序提取信息并限制响应（见下文），我只需要弄清楚如何从某个序列号开始
NewsObject.all(:order => [:completed_at] , :限制 => 2)
I'm new to Sinatra and I want to create a service for a mobile application. I've created a small project that records entries into the datamapper, and am able to extract all the information and return a json object. The problem is, is that as you add in more data to the database the response will get larger and will take a while to download on a mobile device. So I would like to extract the data in a different way, by giving it the Serial id, I would like to only extract the next 10 entries based on completed_at time (see below).
class NewsObject include DataMapper::Resource property :id, Serial property :title, String property :completed_at, DateTime, :default => DateTime.now end
So far I'm manged to extract the information in the correct order and limit the response (see below), I just need to figure out how to start at a certain Serial id
NewsObject.all(:order => [:completed_at], :limit => 2)
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你试过这个吗？
Have you tried this?