code: def update(self, instance, validated_data):
          
          model = self.Meta.model
          meta = self.Meta.model._meta
          original_virtual_fields = list(meta.virtual_fields)  # copy
  
          if hasattr(model, '_hstore_virtual_fields'):
              # remove hstore virtual fields from meta
              for field in model._hstore_virtual_fields.values():
                  meta.virtual_fields.remove(field)
  
          instance = super(HStoreSerializer, self).update(instance, validated_data)
  
          if hasattr(model, '_hstore_virtual_fields'):
              # restore original virtual fields
              meta.virtual_fields = original_virtual_fields
  
          return instance
docs: temporarily remove hstore virtual fields otherwise DRF considers them many2many