[Python] Slug is not created correctly due to using django parler

I have a problem creating a slug based on the title and pk, due to the use of parler. I'm using Parler for multilinguality in my API, and when I try to create a slug like title-pk I'm getting various bugs. My model:

class Events(TranslatableModel):
...
translations = TranslatedFields(
title=models.CharField(max_length=255, verbose_name=_("Event title")),
body=MDTextField(verbose_name=_("Event body")),
)
slug = models.SlugField(blank=True, max_length=255, verbose_name=_("Event slug"))
...


So, I tried using the save() method, but I got a slug like -None or -pk.

def save(self, *args, **kwargs):
if not self.slug:
title = self.safe_translation_getter("title", language_code="uk")
base_slug = slugify(title)
self.slug = f"{base_slug}-{self.pk}"
super().save(*args, **kwargs)


I also used a signal, which also did not work.

@receiver(post_save, sender=Events)
def generate_slug_after_translation(sender, instance, **kwargs):
if not instance.slug:
uk_title = instance.safe_translation_getter("title", language_code="uk")
if uk_title:
base_slug = f"{uk_title}-{instance.pk}"
instance.slug = slugify(base_slug)[:255]
instance.save(update_fields=["slug"])


What did I do wrong, and what should I do next?

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