Brainstorm's snippets (1/256)

  Check reverse relation for OneToOneField

If related object does not exist, any direct reference to it produces the exception:

RelatedObjectDoesNotExist: Contatore has no pratica.

To avoid it, explicitly test the existence of the attribute:

class Contatore(BaseModel):


    def is_istallato(self):
        return hasattr(self, 'pratica') and self.pratica is not None


class Pratica(BaseModel):


    contatore = models.OneToOneField(Contatore, null=True, blank=True, on_delete=models.SET_NULL)