如何使用 ruby​​ FasterCSV 删除重复列

Question

我正在使用 Ruby 1.8 和 FasterCSV。

我正在读取的 csv 文件有几个重复的列。

| 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

我想将其浓缩为：

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

是否有通用的方法可以做到这一点？

目前我的解决方案是这样的：

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

假设您想摆脱硬编码的删除

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

可以替换为

row = row.to_hash

这将破坏重复项。发布的其余代码将继续工作。