Question

I try to load a yaml file into an array but it fails with undefined method `join’ for “a b c”:String

# Check certain temporarily emails
# Throw notice not accepted use other email
require 'yaml'
bad_hostnames = YAML::load(File.read("#{Rails.root}/config/bad_hosts.yml"))
if /^(#{bad_hostnames.join("|")})$/.match(host)
  errors.add(:email, "Please not use a disposable mailbox")
end

So i required yaml before and on top of the model, controller where I load the yml in:

require 'yaml'

Still same result, in rails console this works flawlessly, what am I missing?
The above code is inside my user.rb model, in console it works

EDIT:
bad_hosts.yml looks like (shortened) 1 provider the line

0-mail.com
10minutemail.com
30minutemail.com
4warding.net

Answer 1

Your .yml file is not a YAML file.

This would make it .yml file.

- 0-mail.com
- 10minutemail.com
- 30minutemail.com
- 4warding.net

But when you want to load just a file line by line try the following:

lines = IO.readlines("#{Rails.root}/config/bad_hosts.yml")
# note: lines end in "\n"