PROSAGA码农传奇-Ruby-如何合并散列数组以匹配列值

<div class =“post-text”itemprop =“text”>
   <pre class="lang-rb prettyprint-override">
    <code>
      array1 = [{"Date" => "2019-01-01", "Plot ID" => 234}, {"Date" => "2019-01-01", "Plot ID" => 235}, {"Date" => "2019-01-01", "Plot ID" => 236}, {"Date" => "2019-01-01", "Plot ID" => 237}, {"Date" => "2019-01-01", "Plot ID" => 238}, {"Date" => "2019-01-01", "Plot ID" => 239}, {"Date" => "2019-01-01", "Plot ID" => 240}, {"Date" => "2019-01-01", "Plot ID" => 241}]
array2 = [{"Date" => "2019-01-01", "Plotting ID" => 234, "size"=> 20, "visit" => 10, "price" => 103}, {"Date" => "2019-01-01", "Plotting ID" => 500,  "size"=> 40, "visit" => 22, "price" => 233}, {"Date" => "2019-01-01", "Plotting ID" => 236,  "size"=> 25, "visit" => 34, "price" => 423}, {"Date" => "2019-01-01", "Plotting ID" => 600,  "size"=> 79, "visit" => 55, "price" => 234}]

grouped = (array2 + array1).group_by { |h| h["Plot ID"] || h["Plotting ID"] }
merged = grouped.values.map { |a| a.inject(:merge) }

# and in case you want exact formatting:
template = { "Date" => nil, "Plot ID" => nil, "size"=> 0, "visit" => 0, "price" => 0 }
normalized = merged.each { |h| template.merge(h).slice(*template.keys) }

</code>
  </pre>
  <P>
    您可以看到每行代码如何对数据进行有意义且独立的转换。我发现这样的代码更容易在调试器中单步执行。
  </p>
  <P>
    学习组合内置的
     <code>
      Enumerable
    </code>
     和
     <code>
      Hash
    </code>
     方法并大大简化您的代码！
  </p>
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