Ruby CSV - get current line/row number

Question

I\'m trying to work out how to get the current line/row number from Ruby CSV. This is my code:

options = {:encoding => \'UTF-8\', :skip_blanks => true}         


        

Answer 1

Ruby 2.6+

Without Headers

CSV.foreach( "data.csv", encoding: "UTF-8" ).with_index do |row, row_number|
  puts row_number
end

With Headers

CSV.foreach( "data.csv", encoding: "UTF-8", headers: true ).with_index( 2 ) do |row, row_number|
  puts row_number # Starts at row 2, which is the first row after the header row.
end

In Ruby 2.6, $INPUT_LINE_NUMBER no longer gives you the current line number. What's worse is that it's returning values of 2 and 1. I'm not sure what that is supposed to represent but it's certainly not the row number. Since it doesn't raise an exception, it can really bite you if you're not checking that value. I highly recommend you replace all occurrences of $INPUT_LINE_NUMBER in your code to avoid this gotcha.