上载的文件中有空行Ruby

Question

When user browses files and clicks submit, I have to upload file to public folder location of rails application. I'm successful to upload this.

But uploaded file has empty rows. How to upload file without empty rows?

Original File

1.ID      Division     Organisation
2.EA011  Maintenance   Repairs
3.EA012  Application   Production

I have to validate headers across rows and then update UI for every row processed. Say i have to validate ID and then show in a form below submit button in same page where i uploaded file. How can i update form after processing each row. and print ID EA011 is valid.

Answer 1

If a file has empty rows, then it has empty rows--you can't change that. However, you can always remove the empty rows from a file:

#Here's a file with an empty row:
File.open('stuff.txt', 'w') do |f|
  f.puts("hello\n\nworld")
end

#Remove the empty rows:
File.open('stuff2.txt', 'w') do |fout|
  IO.foreach('stuff.txt') do |line|
    next if line =~ /\A\s+\z/
    fout.write(line)
  end
end

--output:--
$ ruby myprog.rb
$ cat stuff.txt
hello

world
~/ruby_programs$ cat stuff2.txt
hello
world