render :json => {
"playlist" => playlist_description,
"songs" => @playlist.songs.as_json(:include => {:playlist_songs => {:only => [:id, :position]}})
}
上面的代码导致1 + N查询到数据库,一个为每首歌曲加载playlist_songs。 播放列表已预载入@playlist。Rails:渴望加载as_json包括
这太慢了,我该如何优化?