File not being created in Ruby script -

i trying open non existent file , write it, when run script, no file being created.

here line of code

file.open("valid_policies.txt", 'a+').write(policy_number.to_s + "\n") 

instead of using .write try instead:

file.open("valid_policies.txt", 'a+') {|f| f.write(policy_number.to_s + "\n") }