合并嵌套哈希而不在Ruby中覆盖 [英] Merge nested hash without overwritting in Ruby

问题描述

选中此 Ruby将数组转换为嵌套哈希和其他网站无法实现以下转换:

After checking this Ruby convert array to nested hash and other sites I am not able to achieve the following convertion:

我有这个:

{"a"=>"text"}
{"b"=>{"x"=>"hola"}}
{"b"=>{"y"=>"pto"}

}

我想获得:

{"a"=>text,
    b=>{"x" => "hola",
        "y" => "pto"    
    }
}

直到现在，代码看起来像这样:

Until now the code seems like this:

tm =[[["a"],"text"],[["b","x"],"hola"],[["b","y"],"pto"]]

q = {}
tm.each do |l|
    q = l[0].reverse.inject(l[1]) { |p, n| { n => p } }
    i += 1

end

我尝试使用merge，但是它会覆盖密钥！我也尝试过如何合并两次哈希没有在Ruby中覆盖重复的键?，但是它会不断覆盖.

I tried with merge, but it overwrites the keys!. I tried also this How can I merge two hashes without overwritten duplicate keys in Ruby? but it keeps overwritting.

更新:

如何为未定义的嵌套哈希(级别)执行此操作? hash[key1][key2][key3]... = "value"

How can I do it for an undefined nested hash (level) ? hash[key1][key2][key3]... = "value"

{"a"=>"text"},
    {"b"=>{"x"=>"hola"},
    {"b"=>{"y"=>"pto"},
    {"c"=>{"g"=>{"k" => "test1"}},
    ...
}

推荐答案

对于Rails，有

For Rails there is the deep_merge function for ActiveSupport that does exactly what you ask for.

您可以自己实现以下目标:

You can implement the same for yourself as follows:

class ::Hash
    def deep_merge(second)
        merger = proc { |key, v1, v2| Hash === v1 && Hash === v2 ? v1.merge(v2, &merger) : v2 }
        self.merge(second, &merger)
    end
end

现在

h1 = {"a"=>"text"}
h2 = {"b"=>{"x"=>"hola"}}
h3 = {"b"=>{"y"=>"pto"}}
h1.deep_merge(h2).deep_merge(h3)
# => {"a"=>"text", "b"=>{"x"=>"hola", "y"=>"pto"}}

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