What is the fastest way to validate that a field has no more than n words?
- by James A. Rosen
I have a Ruby-on-Rails model:
class Candidate < ActiveRecord::Base
validates_presence_of :application_essay
validate :validate_length_of_application_essay
protected
def validate_length_of_application_essay
return if application_essay.blank? # don't add a second error message if they didn't fill it out
errors.add(:application_essay, :too_long), unless ...
end
end
Without dropping into C, what is the fastest way to check that the application_essay contains no more than 500 words? You can assume that most essays will be at least 200 words, are unlikely to be more than 5000 words, and are in English (or the pseudo-English sometimes called "business-ese"). You can also classify anything you want as a "word" as long as your classification would be immediately obvious to a typical user. (NB: this is not the place to debate what a "typical user" is :) )
