ruby - Validating a blank field Rails Model -

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this may basic cannot find definitive answer anywhere. have set contact form within app , have put in hidden field when completed disables submit button jquery. attempt @ stopping automated spam..

can add validations in model? 

validates :ghost, :presence => false

looking @ docs invalid? want form fail if field filled in. not sure how go one

edit

so have read possibly use

 validates_exclusion_of :ghost, :on => :create

though still failing dont think passing correct arguments.

:presence => false means disable presence validator.

you need write own absence validation (though in rails 4.0 such validation exists, absence: true).

validate :ghost_is_absent  def ghost_is_absent   errors.add :ghost if ghost.present? end

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