Test + just use reverse

CHANGELOG.rst

@@ -6,7 +6,7 @@ Changelog
 
 * Add an admin command to remove orphaned tags
 * Remove support for Python 3.8
-* Replace `request.get_full_path()` with `request.path` for merge form action
+* Fix an issue where the admin merge tag form redirect would fail when querystrings are present inside the URL
 
 6.1.0 (2024-09-29)
 ~~~~~~~~~~~~~~~~~~

taggit/admin.py

@@ -39,12 +39,11 @@ def render_tag_form(self, request, queryset):
             self.message_user(request, "Please select at least one tag.")
             return redirect(request.get_full_path())
 
+        # set the selected tags into the session, to be used later
         selected_tag_ids = ",".join(selected)
-        redirect_url = f"{request.path}merge-tags/"
-
         request.session["selected_tag_ids"] = selected_tag_ids
 
-        return redirect(redirect_url)
+        return redirect("admin:taggit_tag_merge_tags")
 
     def merge_tags_view(self, request):
         selected_tag_ids = request.session.get("selected_tag_ids", "").split(",")

tests/test_admin.py

@@ -59,6 +59,7 @@ def test_tag_merging(self):
         )
         # we're redirecting
         self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.url, reverse("admin:taggit_tag_merge_tags"))
         # make sure what we expected got into the session keys
         assert "selected_tag_ids" in self.client.session.keys()
         self.assertEqual(