jpemberthy

  validates :email, presence: true, format: { with: /\A[^@]+@([^@\.]+\.)+[^@\.]+\z/ }
  validates :username, presence: true, length: { :minimum => 3 },
            uniqueness: true, format: { with: /^\w+$/ }

jasonrudolph

Programming Achievements: How to Level Up as a Developer

This gist is part of a blog post. Check it out at:

http://jasonrudolph.com/blog/2011/08/09/programming-achievements-how-to-level-up-as-a-developer

RyanScottLewis

module RuleBook
  def RuleBook.add_rules(object, instance_or_class, rules)
    instance_or_class = instance_or_class.to_s.downcase.strip.to_sym
    raise(ArgumentError, "'instance_or_class' must equal :instance or :class") unless [:instance, :class].include?(instance_or_class)
    raise(ArgumentError, "'rules' must be a Hash") unless rules.is_a?(Hash)

    unless object.instance_variable_get(:@_rulebook_initiated) # Class instance variable. Not class variable. Not instance variable. Is confusing.
      object.instance_variable_set(:@_rulebook_initiated, true)
      object.instance_variable_set(:@_rulebook, {:instance=>{}, :class=>{}}) # @_rulebook is actually two rulebooks, instance and class
    end