如何使用ruby FasterCSV刪除重復的列

Question

我正在使用Ruby 1.8和FasterCSV。

我正在閱讀的csv文件有幾列重復的內容。

| acct_id | amount | acct_num | color | acct_id | acct_type | acct_num |
|     345 |  12.34 |      123 |   red |     345 | 'savings' |      123 |
|     678 |  11.34 |      432 | green |     678 | 'savings' |      432 |

...等等

我想濃縮為：

| acct_id | amount | acct_num | color | acct_type |
|     345 |  12.34 |      123 |   red | 'savings' |
|     678 |  11.34 |      432 | green | 'savings' |

有通用的方法嗎？

目前，我的解決方案是這樣的：

headers = CSV.read_line(file)
headers = CSV.read_line # get rid of garbage line between headers and data
FasterCSV.filter(file, :headers => headers) do |row|
  row.delete(6) #delete second acct_num field
  row.delete(4) #delete second acct_id field

  # additional processing on the data
  row['color'] = color_to_number(row['color'])
  row['acct_type'] = acct_type_to_number(row['acct_type'])
end

Answer 1

假設您要擺脫硬編碼的刪除

  row.delete(6) #delete second acct_num field
  row.delete(4) #delete second acct_id field

可以替換為

row = row.to_hash

這將破壞重復項。 其余已發布的代碼將繼續工作。