如何从Rails的哈希列表中删除嵌套键 [英] How to remove nested keys from a hash list in Rails

问题描述

我现在正尝试几个小时，以删除哈希列表的嵌套哈希键. 我看到许多解决方案的非嵌套哈希看起来像这样:

I am now trying for some hours to remove a nested hash key of a hash list. I saw many solution non-nested hashs wich looks like this:

   sample_hash = {"key1" => "value1", "key2" => "value2"}
   sample_hash.except("key1") 

结果是:

  {"key2"=>"value2"}

但是，如果我尝试在带有嵌套键的哈希上使用except方法，那么它将无法正常工作. 这是我的代码:

But if I try to use the except method on a hash with nested key then it doesn't work. Here my code:

  nested_hash = {"key1"=>"value1", "key2"=>{
                                           "nested_key1"=>"nestedvalue1",
                                           "nested_key2"=>"nestedvalue2"
                                           }
                }

  nested_hash.except("nested_key2")

exception()方法将返回nested_hash，而不进行任何更改.我一直在寻找一种解决方案，如何将嵌套的哈希键传递给except方法，但找不到任何东西.甚至可以将嵌套键传递给此方法，还是应该使用其他方法从哈希列表中删除嵌套哈希键?

The except() method returns the nested_hash without any changes. I have looked for a solution how I can pass nested hash-keys to the except method, but couldn't find anything. Is it even possible to pass nested keys to this method or should I use some other method which deletes a nested hash key from my hash list?

推荐答案

有关

Hash[nested_hash.map {|k,v| [k,(v.respond_to?(:except)?v.except("nested_key2"):v)] }]

=> {"key1"=>"value1", "key2"=>{"nested_key1"=>"nestedvalue1"}}

哦.

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