module ActiveModel::Validations::ClassMethods

Person._validate_callbacks.empty? # => true

so that:
Also, the callback set by validate :cannot_be_robot will be erased

Person.validators # => []

validators this class has, you would obtain:
If one runs Person.clear_validators! and then checks to see what

# ]
# #
# #,
# #,
# => [
Person.validators

end
end
errors.add(:base, 'A person cannot be a robot') if person_is_robot
def cannot_be_robot

validate :cannot_be_robot
validates_with StrictValidator, strict: true
validates_with OtherValidator, on: :create
validates_with MyValidator

include ActiveModel::Validations
class Person

of +validate+.
+validates_with+ and the callbacks that are set by an invocation
It clears the validators that are created with an invocation of
the model for both the +validates_with+ and +validate+ methods.
Note that this will clear anything that is being used to validate

Clears all of the validators and validations.

def clear_validators!
  reset_callbacks(:validate)
  _validators.clear
end