基于某个键的相同值合并哈希数组的最佳方法是什么?

How is the best way to merge array of hashes based on same value of some key?

我有一些具有相同键的散列数组。像下面这样:

entities = [
  {type: :user, name: 'Tester', phone: '0000-0000'},
  {type: :user, name: 'Another User', phone: '0000-0000'},
  {type: :company, name: 'A.C.M.E.', phone: '0000-0000'},
  {type: :user, name: 'John Appleseed', phone: '0000-0000'},
  {type: :company, name: 'Aperture Industries', phone: '0000-0000'}
]

我需要根据某个键的值来组织它们,根据原始散列的某个键的值生成一个新的散列,例如type

我这样做是为了组织:

by_type = {}
entities.each do |entity|
  by_type[entity[:type]] ||= []
  by_type[entity[:type]] << entity
end

结果是我需要的:

by_type = {
  user: [
    {type: :user, name: 'Tester', phone: '0000-0000'},
    {type: :user, name: 'Another User', phone: '0000-0000'},
    {type: :user, name: 'John Appleseed', phone: '0000-0000'}
  ],
  company: [
    {type: :company, name: 'A.C.M.E.', phone: '0000-0000'},
    {type: :company, name: 'Aperture Industries', phone: '0000-0000'}
  ]
}

有另一种方式或优雅的方法来组织这个吗?

你可以使用 group_by:

entities.group_by { |entity| entity[:type] }