组合 4 个数组以在散列中创建散列答案

【问题标题】：Combine 4 arrays to create a hash within a hash组合 4 个数组以在散列中创建散列
【发布时间】：2014-03-16 18:41:34
【问题描述】：

我有以下数组

campaign_names = ["Air Duct Cleaning", "Carpet Cleaning", "Brand Terms", "Upholstery Cleaning"]

impressions = ["358", "1404", "1853", "184"]

clicks = ["3", "6", "53", "0"]

conversions = ["0", "0", "2", "0"]

我想在散列中创建一个散列，以便campaign_names 元素是嵌套散列，然后印象、点击和转换是其中的键，值是每个元素的数组元素。 所需的输出是 -

Hash = {:Air_Duct_Cleaning => { :impressions => "358", :clicks => "3", :conversions => "0" }, :Carpet_Cleaning => { :impressions => "1404", :clicks => "6", :conversions => "0" }, :Brand_Terms => { :impressions => "1853", :clicks => "53", :conversions => "2" }, :Upholstery_Cleaning => { :impressions => "184", :clicks => "0", :conversions => "0" }}

我一直在尝试使用 #zip 来组合它们，然后我希望使用 Hash[] 但最终得到一个空哈希（似乎我只能使用 2 个数组来做到这一点）

zipped = campaign_names.zip(impressions, clicks, conversions)
=> [["Air Duct Cleaning", "358", "3", "0"], ["Carpet Cleaning", "1404", "6", "0"], ["Brand Terms", "1853", "53", "2"], ["Upholstery Cleaning", "184", "0", "0"]]
final_hash = Hash[zipped]
=> {}

然后我尝试使用#each_with_index，但我得到的输出只是我正在调用它的数组

hash = {}
campaign_names.each_with_index { |key, index| hash[key] = values[index] }
=> ["Air Duct Cleaning", "Carpet Cleaning", "Brand Terms", "Upholstery Cleaning"]

【问题讨论】：

标签： ruby-on-rails ruby arrays hash

【解决方案1】：

hash = {}
campaign_names.each_with_index { |e,i|
    hash[e.gsub(' ','_').to_sym] = {impressions: impressions[i], clicks: clicks[i], conversations: conversions[i]}
}

【讨论】：

感谢添加_，我忘了我还没有插入那些。效果很好！

【解决方案2】：

campaign_names.zip(impressions, clicks, conversions)
.map{|k, v1, v2, v3| [
  k.gsub(" ", "_").to_sym,
  {impressions: v1, clicks: v2, conversions: v3}
]}.to_h

结果：

{
  :Air_Duct_Cleaning   => {
    :impressions => "358",
    :clicks      => "3",
    :conversions => "0"
  },
  :Carpet_Cleaning     => {
    :impressions => "1404",
    :clicks      => "6",
    :conversions => "0"
  },
  :Brand_Terms         => {
    :impressions => "1853",
    :clicks      => "53",
    :conversions => "2"
  },
  :Upholstery_Cleaning => {
    :impressions => "184",
    :clicks      => "0",
    :conversions => "0"
  }
}

【讨论】：

谢谢萨瓦！这让我非常接近，但我最终得到一个数组，to_h 导致NoMethodError: undefined method to_h for #<Array:0x45af998> 错误。我正在尝试自己完成它，但恐怕我对v1, v2, v2 不熟悉 - 是那些创建集合吗？
每个都是字符串。如果出现错误，您一定是在使用旧系统。

【解决方案3】：

只是为了好玩：

campaign_names.zip(1..campaign_names.size)
  .map{ |x,y| 
        { x => { impressions: impressions[y-1], 
                 clicks: clicks [y-1], 
                 conversions: conversions[y-1] 
               } 
        }
  }.inject("merge")

【讨论】：

我喜欢不同的方法，但我更喜欢更接近我所拥有的方法:) - 我实际上可以在其他东西上使用它+1

【解决方案4】：

我认为你与 each_with_index 关系很亲密

这对我有用...

hash = {}
campaign_names.each_with_index { |c,index| hash[c] = { impressions: impressions[index],      clicks: clicks[index], conversions: conversions[index] }}

请注意，这将返回campaign_names 数组，但您应该会发现哈希将根据您的需要填充。

【讨论】：

【解决方案5】：

只是为了与众不同，不要使用each_with：

hash = {}
campaign_names.length.times do |index| 
    hash[campaign_names[index].gsub(/\s/, '_')] = {
      impressions: impressions[index],
      clicks: clicks[index], 
      conversions: conversions[index]
    } 
end

> hash
=> {"Air_Duct_Cleaning"=>{:impressions=>"358", :clicks=>"3", :conversions=>"0"},
    "Carpet_Cleaning"=>{:impressions=>"1404", :clicks=>"6", :conversions=>"0"},
    "Brand_Terms"=>{:impressions=>"1853", :clicks=>"53", :conversions=>"2"},
    "Upholstery_Cleaning"=>{:impressions=>"184", :clicks=>"0", :conversions=>"0"}}

【讨论】：