Question

I need to add validation on a before_validation model filter. How can I do that?

Thanks in advance

—
EDIT
I didn’t express myself correctly. I need to add validation on a callback like that:

validate :check_length

def check_length
 if my_conditional
     validates_length_of   :name, :minimum => 5
 else
     validates_length_of   :name, :minimum => 7
end

Answer 1

You will have to create a method and call it from the callback

    before_validation :run_this_check


    def run_this_check
    ##run your validation
       errors.add(:key, "This is your error message")
    end

or if the validation is not dealing with an attribute (or field)

   def run_this_check
     errors.add_to_base('error message')
   end