run_validations

# File activerecord/lib/active_record/validations.rb, line 813
      def run_validations(validation_method)
        validations = self.class.read_inheritable_attribute(validation_method.to_sym)
        if validations.nil? then return end
        validations.each do |validation|
          if validation.is_a?(Symbol)
            self.send(validation)
          elsif validation.is_a?(String)
            eval(validation, binding)
          elsif validation_block?(validation)
            validation.call(self)
          elsif validation_class?(validation, validation_method)
            validation.send(validation_method, self)
          else
            raise(
              ActiveRecordError,
              "Validations need to be either a symbol, string (to be eval'ed), proc/method, or " +
              "class implementing a static validation method"
            )
          end
        end
      end