Validate on custom words

Question

I have a field in my form, that should not accept some specific words(www, ftp, smtp, etc). Is there any validator that could make some kind of black listed words, that can not be written to db?

Answer 1

You should create your own black list validator. The syntax could be

validates :field, :black_list => {:file_path => "/path/to/words_file"}

Your validator will look to each word in the /path/to/words_file file and add errors on your model if the attribute field contains one black listed word.

Answer 2

validates :subdomain, :exclusion => { :in => %w(www ftp smtp) }

ref: rails guide