Handle missing viewset in content summary href

CHANGES/+content-href-missing-viewset.bugfix

@@ -0,0 +1 @@
+Fixed repository version serialization failing with `LookupError` when the version contains a content type that has no registered viewset.

pulpcore/app/models/repository.py

@@ -1579,10 +1579,10 @@ def get_content_href(self, request=None):
         )
         ctypes = {c.get_pulp_type(): c for c in repository_model.CONTENT_TYPES}
         ctype_model = ctypes[self.content_type]
-        ctype_view = get_view_name_for_model(ctype_model, "list")
         try:
+            ctype_view = get_view_name_for_model(ctype_model, "list")
             ctype_url = reverse(ctype_view, request=request)
-        except django.urls.exceptions.NoReverseMatch:
+        except (LookupError, django.urls.exceptions.NoReverseMatch):
             # We've hit a content type for which there is no viewset.
             # There's nothing we can do here, except to skip it.
             return

pulpcore/tests/unit/models/test_repository.py

@@ -813,3 +813,22 @@ def test_batch_operations_preserve_correctness(repository, db):
     assert rvcd_qs.get(count_type=RepositoryVersionContentDetails.PRESENT).count == 40
     assert rvcd_qs.filter(count_type=RepositoryVersionContentDetails.ADDED).first() is None
     assert rvcd_qs.get(count_type=RepositoryVersionContentDetails.REMOVED).count == 60
+
+
+def test_get_content_href_without_viewset(db, repository, monkeypatch):
+    """A content type with no registered viewset yields no href instead of raising."""
+
+    def no_viewset(model_obj, view_action):
+        raise LookupError(f"Could not determine ViewSet base name for model {model_obj}")
+
+    monkeypatch.setattr(Repository, "CONTENT_TYPES", [Content])
+    monkeypatch.setattr("pulpcore.app.models.repository.get_view_name_for_model", no_viewset)
+    version = RepositoryVersion.objects.create(repository=repository, number=1, complete=True)
+    count_detail = RepositoryVersionContentDetails.objects.create(
+        repository_version=version,
+        content_type=Content.get_pulp_type(),
+        count_type=RepositoryVersionContentDetails.ADDED,
+        count=1,
+    )
+
+    assert count_detail.get_content_href() is None