code: def get_queryset(self, value, row, *args, **kwargs):
          
          return self.model.objects.all()
docs: Returns a queryset of all objects for this Model.
  
          Overwrite this method if you want to limit the pool of objects from
          which the related object is retrieved.
  
          :param value: The field's value in the datasource.
          :param row: The datasource's current row.
  
          As an example; if you'd like to have ForeignKeyWidget look up a Person
          by their pre- **and** lastname column, you could subclass the widget
          like so::
  
              class FullNameForeignKeyWidget(ForeignKeyWidget):
                  def get_queryset(self, value, row):
                      return self.model.objects.filter(
                          first_name__iexact=row["first_name"],
                          last_name__iexact=row["last_name"]
                      )