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method

validates_exclusion_of

Importance_2
Ruby on Rails latest stable (v4.0.2) - 0 notes - Class: ActiveModel::Validations::ClassMethods

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v2.3.8) is shown here.

These similar methods exist in v4.0.2:

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"
    validates_exclusion_of :format, :in => %w( mov avi ), :message => "extension %s is not allowed"
  end

Configuration options:

  • :in - An enumerable object of items that the value shouldn’t be part of
  • :message - Specifies a custom error message (default is: "is reserved")
  • :allow_nil - If set to true, skips this validation if the attribute is nil (default is: false)
  • :allow_blank - If set to true, skips this validation if the attribute is blank (default is: false)
  • :if - Specifies a method, proc or string to call to determine if the validation should occur (e.g. :if =&gt; :allow_validation, or :if =&gt; Proc.new { |user| user.signup_step &gt; 2 }). The method, proc or string should return or evaluate to a true or false value.
  • :unless - Specifies a method, proc or string to call to determine if the validation should not occur (e.g. :unless =&gt; :skip_validation, or :unless =&gt; Proc.new { |user| user.signup_step &lt;= 2 }). The method, proc or string should return or evaluate to a true or false value.
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