ruby/rails NoMethodError? when using custom validation method

Question

i'v been new to ruby and rails and encountered a rather strange error:

class Person < ActiveRecord::Base
    validates_presence_of :description, :if => require_description_presence?

    def require_description_presence?
        self.can_send_email
    end
end

raises

NoMethodError in PeopleController#index

undefined method `require_description_presence?' for #<Class:0x4c4fadc> 

Answer 1

You should pass validation method as symbol:

validates_presence_of :description, :if => :require_description_presence?