包括数组的关联

Question

使用Rails 3.2，我有以下原始代码：

nearby_spots = current_spot.nearbys(10, :order => 'overall_rating 
DESC').where(:spot_type => spot_type).includes(:photos).first(5)

出于某些性能原因，我必须将代码分成以下内容：

# retrieve all records without any order
x = current_spot.nearbys(10, :order => false).where(:spot_type => spot_type)

# sort by overall_rating using Rails instead of SQL, and take first 5
nearby_spots = (x.sort! { |a,b| b.overall_rating <=> a.overall_rating }).first(5)

nearby_spots是一个对象数组。如何像原始文件一样急切加载photos？ .includes仅适用于类，而非数组。

Answer 1

使用preloader，添加以下行：

ActiveRecord::Associations::Preloader.new(nearby_spots, :photos).run()