本文介绍了使用来自相应模型的方法对散列进行排序的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
假设你有一个模型Dog,其属性为年龄,它决定了吠叫频率:
Let's say you have a model Dog with an attribute "age" a method that determines "barking frequency":
class Dog < ActiveRecord::Base
scope by_age, -> { order('age ASC') }
def barking_frequency
# some code
end
end
在你的控制器中你有:
In your controller you have:
def index
@dogs = Dog.by_age
end
一旦您拥有@dogs的哈希值,你怎么能通过barking_frequency对它进行排序,以便结果保持特定年龄段的狗一起排序,如下所示:
Once you have the hash for @dogs, how can you sort it by barking_frequency, so that the result keeps the dogs of a particular age sorted together, like this:
Name Age Barking Frequency
Molly 2 1
Buster 2 4
Jackie 2 7
Dirk 3 1
Hank 3 3
Jake 3 4
Spot 10 0
推荐答案
b
$ b
Below will work:
def index
@dogs = Dog.by_age.sort_by { |dog| [dog.age, dog.barking_frequency] }
end
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