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CSV を文字コード変換しつつロード

Posted at
CSV.foreach(filename, encoding: "Shift_JIS:UTF-8") do |row|
  # …
end

だが、未定義文字があるとエラーに。

Kernel#open だと

open(filename, "rb:Shift_JIS:UTF-8", undef: :replace) do |f|
  # …
end

のように、String#encode と同じオプションが渡せるが、CSV ではここにオプションを渡すすべはない。

よって Kernel#open と併用する。

open(filename, "rb:Shift_JIS:UTF-8", undef: :replace) do |f|
  CSV.new(f).each do |row|
    # ...
  end
end
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