如何对ruby中的散列进行排序

I have an array, each of whose elements is a hash with three key/value pairs:

我有一个数组，每个元素都是一个散列，有三个键/值对:

:phone => "2130001111", :zip => "12345", :city => "sometown"

I'd like to sort the data by zip so all the phones in the same area are together. Does Ruby have an easy way to do that? Can will_paginate paginate data in an array?

我想把数据按zip分类，以便同一地区的所有电话都在一起。Ruby有一种简单的方法吗?will_paginate在数组中分页数据吗?

6 个解决方案

#1

296

Simples:

样品:

array_of_hashes.sort_by { |hsh| hsh[:zip] }

Note:

注意:

When using sort_by you need to assign the result to a new variable: array_of_hashes = array_of_hashes.sort_by{} otherwise you can use the "bang" method to modify in place: array_of_hashes.sort_by!{}

在使用sort_by时，需要将结果分配给一个新变量:array_of_hashes = array_of_hashes。否则，您可以使用“bang”方法就地进行修改:array_of_hashes.sort_by!

#2

sorted = dataarray.sort {|a,b| a[:zip] <=> b[:zip]}

#3

Use the bang to modify in place the array:

使用bang对数组进行修改:

array_of_hashes.sort_by!(&:zip)

Or re-assign it:

或重新分配:

array_of_hashes = array_of_hashes.sort_by(&:zip)

Note that sort_by method will sort by ascending order.

注意sort_by方法将按升序排序。

If you need to sort with descending order you could do something like this:

如果你需要按照降序排序你可以这样做:

array_of_hashes.sort_by!(&:zip).reverse!

或

array_of_hashes = array_of_hashes.sort_by(&:zip).reverse

#4

If you want to paginate for data in array you should require 'will_paginate/array' in your controller

如果要对数组中的数据进行分页，应该在控制器中要求“will_paginate/array”。

#5

nil is not comparable so to avoid meeting it

nil是无法与之相比的，所以避免遇到它。

sorted = dataarray.sort do |a,b| 
  if a[:zip] == nil
    -1                       # nil gets to the start, swap if you need otherwise
  elsif b[:zip] == nil
     1
  else
    a[:zip] <=> b[:zip]
  end
end

#6

If you have Nested Hash (Hash inside a hash format) as Array elements (a structure like the following) and want to sort it by key (date here)

如果您将嵌套散列(哈希格式中的散列)作为数组元素(如下所示的结构)并希望按键(这里的日期)对其进行排序

data =  [
    {
        "2018-11-13": {
            "avg_score": 4,
            "avg_duration": 29.24
        }
    },
    {
         "2017-03-13": {
            "avg_score": 4,
            "avg_duration": 40.24
        }
    },
    {
         "2018-03-13": {
            "avg_score": 4,
            "avg_duration": 39.24
        }
    }
]

Use Array 'sort_by' method as

使用数组'sort_by'方法as

data.sort_by { |element| element.keys.first }

#1

296