Count the length (number of lines) of a CSV file?

Question

I have a form (Rails) which allows me to load a .csv file using the file_field. In the view:

    <% form_for(:upcsv, :html => {:multipa         


        

Answer 1

If your csv file doesn't fit to memory (can't use readlines), you can do:

def self.line_count(f)
  i = 0
  CSV.foreach(f) {|_| i += 1}
  i
end

Unlike wc -l this counts actual record count, not number of lines. These can be different if there are new lines in field values.