Make tag search and assignment case insensitive (#56)

* Make tag assignment and search case-insensitive (#45)

* Add tests for tag case-sensitivity and deduplication (#45)

Co-authored-by: Sascha Ißbrücker <sissbruecker@lyska.io>

bookmarks/services/tags.py

@@ -1,18 +1,21 @@
+import operator
 from typing import List
 
 from django.contrib.auth.models import User
 from django.utils import timezone
 
 from bookmarks.models import Tag
+from bookmarks.utils import unique
 
 
 def get_or_create_tags(tag_names: List[str], user: User):
-    return [get_or_create_tag(tag_name, user) for tag_name in tag_names]
+    tags = [get_or_create_tag(tag_name, user) for tag_name in tag_names]
+    return unique(tags, operator.attrgetter('id'))
 
 
 def get_or_create_tag(name: str, user: User):
     try:
-        return Tag.objects.get(name=name, owner=user)
+        return Tag.objects.get(name__iexact=name, owner=user)
     except Tag.DoesNotExist:
         tag = Tag(name=name, owner=user)
         tag.date_added = timezone.now()