validates_exclusion_of(*attr_names) public

Validates that the value of the specified attribute is not in a particular enumerable object.

  class Person < ActiveRecord::Base
    validates_exclusion_of :username, :in => %w( admin superuser ), :message => "You don't belong here"
    validates_exclusion_of :age, :in => 30..60, :message => "This site is only for under 30 and over 60"

Configuration options:

  • in - An enumerable object of items that the value shouldn’t be part of
  • message - Specifies a customer error message (default is: "is reserved")
  • allow_nil - If set to true, skips this validation if the attribute is null (default is: false)
  • if - Specifies a method, proc or string to call to determine if the validation should

occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The method, proc or string should return or evaluate to a true or false value.

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