chore: create flag and custom manager

backend/apps/comment/managers.py

@@ -0,0 +1,18 @@
+from django.db import models
+
+from .models import CommentModel
+
+
+class CommentManager(models.Manager):
+    def soft_delete(self, instance: CommentModel):
+        # if no children- hard delete
+        if instance.children_count == 0:
+            instance.delete()
+        # else- soft delete
+        else:
+            instance.deleted = True
+            instance.content = "[deleted]"
+            instance.save()
+
+    def clean_up_soft_deleted(self):
+        self.filter(deleted=True, children_count=0).delete()

backend/apps/comment/models.py

@@ -11,7 +11,7 @@
 
 class CommentModel(CreatedAtMixin, TreeModel):
     quibbler = models.ForeignKey(
-        ProfileModel, on_delete=models.CASCADE, verbose_name=_('quibbler')
+        ProfileModel, on_delete=models.SET_NULL, null=True, verbose_name=_('quibbler')
     )
     content = models.TextField(_('content'))
     upvotes = models.ManyToManyField(
@@ -20,13 +20,15 @@ class CommentModel(CreatedAtMixin, TreeModel):
     downvotes = models.ManyToManyField(
         ProfileModel, related_name='downvotes', blank=True, verbose_name=_('downvotes')
     )
+    # flag
+    deleted = models.BooleanField(default=False)
 
     @property
     def children_count(self):
         return self.children().count()
 
     def __str__(self) -> str:
-        return f"Comment by {self.quibbler.username}"
+        return f"Comment by {self.quibbler}"
 
     class Meta:  # pyright: ignore
         indexes = [idx.GistIndex(fields=['path'])]