排序给另一个哈希散列一个包括有关订单的方法的信息 [英] Sorting an hash given another hash including information about the order method

问题描述

我on Rails的3.0.7使用Ruby，我想整理的散通过返回考虑preSET顺序排序的阵列，甚至一个新的分类散。也就是说，给定以下散，说HASH1（为此我考虑它的值，以指示的顺序方法从1到4）

I am using Ruby on Rails 3.0.7 and I would like to sort an hash considering a preset order by returning a sorted array or even a new sorted hash. That is, given the following hash, say HASH1 (for which I consider its values to indicate the order method from 1 to 4)

{
  :dog  => 3,
  :cat  => 2,
  :pig  => 4,
  :frog => 1
}

我想这个排序其他散按键，说HASH2，通过考虑HASH1值给定的顺序

I would like to sort this other hash by key, say HASH2, by considering the order given in HASH1 values

{
  :cat  => 'cat_value',
  :dog  => 'dog_value',
  :frog => 'frog_value',
  :pig  => 'pig_value'
}

因此​​，在上述情况下，我应该有输出\\下令散这样的：

{
  :frog => 'frog_value', # Order indicated by ':frog => 1' in the HASH1
  :cat  => 'cat_value',  # Order indicated by ':cat => 2'  in the HASH1
  :dog  => 'dog_value',  # Order indicated by ':dog => 3'  in the HASH1
  :pig  => 'pig_value'   # Order indicated by ':pig => 4'  in the HASH1
}

或

[
  ["frog", 'frog_value'], # Order indicated by ':frog => 1' in the HASH1
  ["cat", 'cat_value'],   # Order indicated by ':cat => 2'  in the HASH1
  ["dog", 'dog_value'],   # Order indicated by ':dog => 3'  in the HASH1
  ["pig", 'pig_value']    # Order indicated by ':pig => 4'  in the HASH1
]

我怎么能这样做？

推荐答案

使用哈希＃sort_by ：

hash = {
  :cat  => [2],
  :frog => [1],
  :pig  => [4],
  :dog  => [3]
}

order = {
  :dog  => 3,
  :cat  => 2,
  :pig  => 4,
  :frog => 1
}

# array of k, v pairs
p sorted_array = hash.sort_by {|k, v| order[k]}
p sorted_hash = Hash[sorted_array]

输出

[[:frog, [1]], [:cat, [2]], [:dog, [3]], [:pig, [4]]]
{:frog=>[1], :cat=>[2], :dog=>[3], :pig=>[4]}

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