Question

在我的表架构中我有“监听器”表连接到“设备”表（一对多）现在我需要在listener表上搜索但是使用devices.id字段

我的问题是2表应该有很多记录（超过1,000,000），我担心我的查询会使应用程序崩溃我的问题是在选择中我想知道如何才能使这个查询更好

我对gist https://gist.github.com/anonymous/8623345

的完整查询

limit = 10
@listeners = Listener.all
@total_count = @listeners.count
@sEcho = params[:sEcho]

**@listeners =@listeners.where(" (listeners.name like ?) or (listeners.email like ?) or (countries.name like ?) or   (listeners.city like ?)  or   (listeners.id in (select listener_id from devices where id = ?))", "%#{params[:sSearch]}%", "%#{params[:sSearch]}%" , "%#{params[:sSearch]}%","%#{params[:sSearch]}%","#{params[:sSearch]}") if params[:sSearch].present?**

order_by ="listeners.id asc"
@listeners = @listeners.includes(:devices)
@listeners = @listeners.includes(:country) 
@count = @listeners.count
@listeners = @listeners.order(order_by)
@listeners = @listeners.limit(limit).offset(params[:iDisplayStart])

Answer 1

你需要使用kaminari或者将分页用于分页，你要使它更复杂，这是我认为最短的形式：

Listener.includes(:devices, country).where(" (listeners.name like ?) or (listeners.email like ?) or (countries.name like ?) or   (listeners.city like ?)  or   (listeners.id in (select listener_id from devices where id = ?))", "%#{params[:sSearch]}%", "%#{params[:sSearch]}%" , "%#{params[:sSearch]}%","%#{params[:sSearch]}%","#{params[:sSearch]}").limit(limit).offset(params[:iDisplayStart]||1).order(:id)

rails使查询更好

1 个答案: