Add automatic category sorting

nummi/main/models.py

@@ -6,10 +6,21 @@ from django.forms import ModelForm
 class Category(models.Model):
     id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     name = models.CharField(max_length=64)
+    full_name = models.CharField(max_length=512, editable=False, default="")
     parent = models.ForeignKey("self", on_delete=models.SET_NULL, blank=True, null=True)
 
     def __str__(self):
-        return self.name
+        if self.parent is None: return self.name
+        return f"{self.parent}>{self.name}"
+
+    def save(self, *args, **kwargs):
+        self.full_name = str(self)
+        super().save(*args, **kwargs)
+        for child in self.__class__.objects.filter(parent=self):
+            child.save()
+
+    class Meta:
+        ordering = ['full_name']
 
 
 class Transaction(models.Model):