validation_inclusion_of

validates_inclusion_of(*attr_names) public

Validates whether the value of the specified attribute is available in a particular enumerable object.

class Person %w( m f )
validates_inclusion_of :age, :in => 0..99
validates_inclusion_of :format, :in => %w( jpg gif png ), :message => “extension %s is not included in the list”
end

Configuration options:

* :in – An enumerable object of available items
* :message – Specifies a custom error message (default is: “is not included in the list”)
* :allow_nil – If set to true, skips this validation if the attribute is null (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 => :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.
* :unless – Specifies a method, proc or string to call to determine if the validation should not occur (e.g. :unless => :skip_validation, or :unless => 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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My note: it can be allowed to be nil when you specified. Wen you don’t, nil value will fail the validation

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