如何只用20个最近的对象响应一个json请求？ （导轨）

Question

I wish to send to the client only the 20 recent Post objects.

How do i that? I'm new to rails so ill appreciate your advice very much. thanks.

Answer 1

Just do:

@posts = Post.all(:order => 'created_at desc', :limit => 20)
respond_to do |format|
  format.json  
end