                            'Use the `required` keyword argument instead.',
                            DeprecationWarning, stacklevel=2)
              kwargs['required'] = not kwargs.pop('null')
  
          self.queryset = kwargs.pop('queryset', None)
          self.many = kwargs.pop('many', self.many)
          if self.many:
              self.widget = self.many_widget
              self.form_field_class = self.many_form_field_class
  
 
</s>
        queryset = kwargs.pop('queryset', None)
                            'Use the `required` keyword argument instead.',
                            DeprecationWarning, stacklevel=2)
              kwargs['required'] = not kwargs.pop('null')
  
        queryset = kwargs.pop('queryset', None)
          self.many = kwargs.pop('many', self.many)
          if self.many:
              self.widget = self.many_widget
              self.form_field_class = self.many_form_field_class
  
keep keep keep keep replace keep keep keep keep keep
 Display an empty label into related fields if it isn't required
rest_framework/relations.py