generate?

# File railties/guides/rails_guides/generator.rb, line 120
    def generate?(source_file, output_file)
      fin  = File.join(source_dir, source_file)
      fout = File.join(output_dir, output_file)
      all || !File.exists?(fout) || File.mtime(fout) < File.mtime(fin)
    end