如何按两个条件对 ruby​​ 数组进行排序

Question

我想按两个不同的条件对该数组进行排序。

首先我想按类型对数组进行排序：类型可以是 (1,2,3,4)，我想按 4 - 1 - 2 - 3 的顺序对它们进行排序。

然后在每种不同的类型中，我想按百分比降序对它们进行排序。

所以排序后的数组应该是这样的：

[
  <OpenStruct percent=70, type=4>,
  <OpenStruct percent=60, type=4>,
  <OpenStruct percent=50, type=4>,
  <OpenStruct percent=73, type=1>,
  <OpenStruct percent=64, type=1>,
  <OpenStruct percent=74, type=2>
]ect

我怎样才能完成这种排序？目前我只能按类型降序排序。

array = array.sort_by {|r| r.type }

Answer 1

应该这样做：

require 'ostruct'
arr = [
  OpenStruct.new(percent: 73, type: 1),
  OpenStruct.new(percent: 70, type: 4),
  OpenStruct.new(percent: 60, type: 4),
  OpenStruct.new(percent: 50, type: 4),
  OpenStruct.new(percent: 64, type: 1),
  OpenStruct.new(percent: 74, type: 2)
]


puts arr.sort_by { |a| [a.type % 4, -a.percent] }

输出：

#<OpenStruct percent=70, type=4>
#<OpenStruct percent=60, type=4>
#<OpenStruct percent=50, type=4>
#<OpenStruct percent=73, type=1>
#<OpenStruct percent=64, type=1>
#<OpenStruct percent=74, type=2>