ruby - 比较哈希数组并打印预期和实际结果

Question

我有 2 个哈希数组:

actual = [{"column_name"=>"NONINTERESTINCOME", "column_data_type"=>"NUMBER"},
 {"column_name"=>"NONINTERESTEXPENSE", "column_data_type"=>"VARCHAR"},
 {"column_name"=>"TRANSACTIONDATE", "column_data_type"=>"TIMESTAMP"},
 {"column_name"=>"UPDATEDATE", "column_data_type"=>"TIMESTAMP"}]
expected = [{"column_name"=>"NONINTERESTINCOME", "column_data_type"=>"NUMBER"},
 {"column_name"=>"NONINTERESTEXPENSE", "column_data_type"=>"NUMBER"},
 {"column_name"=>"TRANSACTIONDATE", "column_data_type"=>"NUMBER"},
 {"column_name"=>"UPDATEDATE", "column_data_type"=>"TIMESTAMP"}]

我需要比较这 2 个哈希并找出 column_data_type 不同的那些。

比较我们可以直接使用:

diff = actual -   expected

这会将输出打印为:

{"column_name"=>"NONINTERESTEXPENSE", "column_data_type"=>"VARCHAR"}
{"column_name"=>"TRANSACTIONDATE", "column_data_type"=>"TIMESTAMP"}

我的预期输出是在结果中我想打印实际和预期的数据类型，这意味着实际和预期的哈希数组中缺失的“column_name”的数据类型，例如:

{"column_name"=>"NONINTERESTEXPENSE", "expected_column_data_type"=>"NUMBER", "actual_column_data_type" => "VARCHAR"}
{"column_name"=>"TRANSACTIONDATE", "expected_column_data_type"=>"NUMBER","actual_column_data_type" => "TIMESTAMP" }

Answer 1

无论数组中散列的顺序如何，这都会起作用。

diff = []

expected.each do |elem|
  column_name = elem['column_name']
  column_type = elem['column_data_type']
  match = actual.detect { |elem2| elem2['column_name'] == column_name  }
  if column_type != match['column_data_type']
    diff << { 'column_name' => column_name,
              'expected_column_data_type' => column_type,
              'actual_column_data_type' => match['column_data_type'] }
  end
end

p diff