code: def get_relation_kwargs(field_name, relation_info):
      
      model_field, related_model = relation_info
      kwargs = {}
      if related_model and not issubclass(related_model, EmbeddedDocument):
          kwargs['queryset'] = related_model.objects
  
      if model_field:
          if hasattr(model_field, 'verbose_name') and needs_label(model_field, field_name):
              kwargs['label'] = capfirst(model_field.verbose_name)
          if hasattr(model_field, 'help_text'):
              kwargs['help_text'] = model_field.help_text
  
          kwargs['required'] = model_field.required
  
          if model_field.null:
              kwargs['allow_null'] = True
          if getattr(model_field, 'unique', False):
              validator = UniqueValidator(queryset=related_model.objects)
              kwargs['validators'] = [validator]
  
      return kwargs
docs: Creating a default instance of a flat relational field.