Solutions to Validations

gistfile1.rb

# Validate AGE is above 16
# Validate First Name is longer than 5 characters
# Validate Username is unique

class User < ActiveRecord::Base
  attr_accessible(:age, :first_name, :last_name, :username)

  validates :age, numericality: { greater_than: 16 }
  validates :first_name, length: { minimum: 5 }
  validates :username, uniqueness: true
end