ruby-on-rails - 如何通过设置关键元素的优先级来使用字符串键对 ruby​​ 散列进行排序？

Question

我有一个具有以下值的散列:

hash = {
  'red': { something: ''},
  'green': { something: '' },
  'yellow': { something: ''}
}

做这样的事情最简单的方法是什么:

hash.sort_by_key_with_priority(['green', 'yellow', 'red'])

并返回:

hash = {
  'green': { something: '' },
  'yellow': { something: ''},
  'red': { something: ''},
}

Answer 1

如果您的优先级数组包含所有哈希键，则不需要排序。您可以简单地将散列拆开并构建一个新散列。

hash = {
  red: { something: ''},
  green: { something: '' },
  yellow: { something: ''}
}

priority = %i[green yellow red]

hash.slice(*priority)
# => {:green=>{:something=>""}, :yellow=>{:something=>""}, :red=>{:something=>""}}