lib/respect/has_constraints.rb
def validate(object)
      sanitized_object = validate_type(object)
      validate_constraints(sanitized_object) unless sanitized_object.nil? && allow_nil?
      self.sanitized_object = sanitized_object
      true
    rescue ValidationError => e
      # Reset sanitized object.
      self.sanitized_object = nil
      raise e
    end
def validate(object)
      sanitized_object = validate_type(object)
      validate_constraints(sanitized_object) unless sanitized_object.nil? && allow_nil?
      self.sanitized_object = sanitized_object
      true
    rescue ValidationError => e
      # Reset sanitized object.
      self.sanitized_object = nil
      raise e
    end
Call +validate_type+ with the given +object+, apply the constraints
 and assign the sanitized object.