Question

有办法做到这一点吗？这称为复合键吗？

{
  "MyModel" : {
    "type" : "object",
    "properties" : {
      "dummyAttrib" : {
        "type" : "object",
        "description" : "dummyAttrib"
      }
    }
  }
}

Answer 1

Hash内置了通配符解释。您可以使用以下内容实现自己的目标：

class MyHash < Hash
  def select_composite(key)
    mkeys = matching_keys(key)
    select { |k, _| mkeys.include?(k) }
  end

  private 

  def matching_keys(key)
    keys.select { |hkey| matching_key?(hkey, key) }
  end

  def matching_key?(hkey, key)
    elements = Array(key)
    Array(hkey).each_with_index.select { |helement, i|
      helement == elements[i] || elements[i] == '*'
    }.count == elements.count
  end
end

a = MyHash[{ %w(key1 key2) => "stuff" }]
a.select_composite(%w(key1 *))

Answer 2

不，没有。您需要对哈希中的所有键进行线性搜索，以查找符合您特定条件的键。

嵌套哈希后你真正的目标是什么：

a = {
  key1: {
    key2: "stuff"
  }
}

a[:key1][:key2] # "stuff"
a[:key1] # { key2: "stuff" }

Ruby，Hash，使用复合键的一部分

2 个答案: