转换此哈希的最佳方法是什么？

Question

我有一个 Ruby 散列，我需要将其转换为另一种格式。考虑到 'array' 的大小是 unknown/unlimited，您如何 'flatten' 将此散列为所需的格式？

原始哈希

{
  :parameters => {
    :'userResponse.objectInstanceType' => 'QuesAnsResponse',
    :'userResponse.quesAnsDetailArray' => {
      :'0' => {
        '.answer'=> 'Texas'
      },
      :'1' => {
        '.answer' => 'w3schools'
      }
    }
  }
}

所需格式：

{
  :parameters => {
    :'userResponse.objectInstanceType' => 'QuestionAnsResponse',
    :'userResponse.quesAnsDetailArray[0].answer' => 'Texas',    
    :'userResponse.quesAnsDetailArray[1].answer' => 'w3schools'
  }
}

Answer 1

如果您可以对输入的结构做出一些假设，即它在 "userResponse.quesAnsDetailArray" 部分中有编号的响应，那么您可以按照以下方式做一些事情：

new_hash = { 'parameters' => 
  { 'userResponse.objectInstanceType' => 'QuestionAnsResponse' } }

hash['parameters']['userResponse.quesAnsDetailArray'].each_pair do |index, details|
  details.each_pair do |field, value|
    new_hash['parameters']["userResponse.quesAnsDetailArray[#{index}]#{field}"] = value
  end
end

Answer 2

我假设哈希如下：

h = {
  'parameters'=> {
    'userResponse.objectInstanceType'=> 'QuesAnsResponse',
    'userResponse.quesAnsDetailArray'=> {
      '0'=> {
        '.answer'=> '',
        '.answerFieldType'=> 'text',
        '.isRequired'=> 'true',
        '.metaData'=> 'QUESTION_1',
        '.questionFieldType'=> 'label',
        '.question'=> 'What is the name of your state?'
      },
      '1'=> {
        '.answer'=> '',
        '.answerFieldType'=> 'text',
        '.isRequired'=> 'true',
        '.metaData'=> 'QUESTION_2',
        '.questionFieldType'=> 'label',
        '.question'=> 'What is the name of your first school'
      }
    }
  }
}

并将其转换为所需格式，如下所示：

{ 'parameters'=> Hash[[
    ['userResponse.objectInstanceType',
      h['parameters']['userResponse.objectInstanceType']],
     *h['parameters']['userResponse.quesAnsDetailArray'].
       flat_map { |ndx,f|
         ["userResponse.quesAnsDetailArray[#{ndx}]"].product(f.to_a) }.
           map { |prefix,(suffix,value)| [prefix+suffix, value] } ]]      
}
  #=> {"parameters"=>
    {"userResponse.objectInstanceType"=>"QuesAnsResponse", 
     "userResponse.quesAnsDetailArray[0].answer"=>"", 
     "userResponse.quesAnsDetailArray[0].answerFieldType"=>"text", 
     "userResponse.quesAnsDetailArray[0].isRequired"=>"true", 
     "userResponse.quesAnsDetailArray[0].metaData"=>"QUESTION_1", 
     "userResponse.quesAnsDetailArray[0].questionFieldType"=>"label", 
     "userResponse.quesAnsDetailArray[0].question"=>
       "What is the name of your state?",
     "userResponse.quesAnsDetailArray[1].answer"=>"", 
     "userResponse.quesAnsDetailArray[1].answerFieldType"=>"text", 
     "userResponse.quesAnsDetailArray[1].isRequired"=>"true", 
     "userResponse.quesAnsDetailArray[1].metaData"=>"QUESTION_2", 
     "userResponse.quesAnsDetailArray[1].questionFieldType"=>"label", 
     "userResponse.quesAnsDetailArray[1].question"=>
       "What is the name of your first school"}}

转换此哈希的最佳方法是什么？

What would be the best way to convert this hash?

ruby

hash

ruby-on-rails