Set slug in save method

aleksis/apps/paweljong/migrations/0012_event_slug.py

@@ -13,7 +13,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='event',
             name='slug',
-            field=models.SlugField(default='', max_length=255, verbose_name='Slug'),
+            field=models.SlugField(max_length=255, verbose_name='Slug'),
             preserve_default=False,
         ),
     ]

aleksis/apps/paweljong/models.py

@@ -4,6 +4,7 @@ from django.db import models
 from django.urls import reverse
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy as _
+from django.utils.text import slugify
 
 from ckeditor.fields import RichTextField
 from django_iban.fields import IBANField
@@ -44,6 +45,15 @@ class Event(ExtensibleModel):
     information = RichTextField(verbose_name=_("Information about the event"))
     terms = models.ManyToManyField(Terms, verbose_name=_("Terms"), related_name="event", blank=True)
 
+    def save(self. *args, **kwargs):
+        if not self.slug:
+            if self.linked_group.short_name:
+                self.slug = slugify(self.linked_group.short_name)
+            else:
+                self.slug = slugify(self.display_name)
+
+        return super().save(*args, **kwargs)
+
     def __str__(self) -> str:
         return self.display_name