相关疑难解决方法(0)

我想合并一个嵌套的哈希.

a = {:book=>
    [{:title=>"Hamlet",
      :author=>"William Shakespeare"
      }]}

b = {:book=>
    [{:title=>"Pride and Prejudice",
      :author=>"Jane Austen"
      }]}

我想合并是:

{:book=>
   [{:title=>"Hamlet",
      :author=>"William Shakespeare"},
    {:title=>"Pride and Prejudice",
      :author=>"Jane Austen"}]}

实现这个目标的巢方法是什么？

我有一个哈希,我正在尝试为它提取键和值.散列具有嵌套散列和/或散列数组.

在检查了这个网站和几个样本后,我得到了关键和值.但是如果它的一系列哈希值很难提取.

例:

{
  :key1 => 'value1',
  :key2 => 'value2',
  :key3 => {
    :key4 => [{:key4_1 => 'value4_1', :key4_2 => 'value4_2'}],
    :key5 => 'value5'
  },
  :key6 => {
    :key7 => [1,2,3],
    :key8 => {
      :key9 => 'value9'
    }
  }
}

到目前为止,我在下面的代码中如何循环遍历ruby中的哈希散列并迭代Ruby中深度嵌套的哈希值

def ihash(h)
  h.each_pair do |k,v|
    if v.is_a?(Hash) || v.is_a?(Array)
      puts "key: #{k} recursing..."
      ihash(v)
    else
      # MODIFY HERE! Look for what you want to find in the hash here
      puts "key: #{k} value: #{v}"
    end
  end …

我有两个哈希,其结构与此类似:

hash_a = { :a => { :b => { :c => "d" } } }
hash_b = { :a => { :b => { :x => "y" } } }

我想将这些合并在一起以产生以下哈希:

{ :a => { :b => { :c => "d", :x => "y" } } }

merge函数将在第一个哈希值中替换:a的值,其值为:第二个哈希值中的a.所以,我编写了自己的递归合并函数,如下所示:

def recursive_merge( merge_from, merge_to )
    merged_hash = merge_to
    first_key = merge_from.keys[0]
    if merge_to.has_key?(first_key)
        merged_hash[first_key] = recursive_merge( merge_from[first_key], merge_to[first_key] )
    else
        merged_hash[first_key] = merge_from[first_key]
    end
    merged_hash
end

但我得到一个运行时错误:can't add a new …