Fix RelatedField rendering wrong domain in hrefs

closes #7835
Assisted By: Claude Opus 4.6

Author: jobselko

CHANGES/7835.bugfix

@@ -0,0 +1 @@
+Fixed `RelatedField` rendering wrong domain in hrefs when `DOMAIN_ENABLED=True`.

pulpcore/app/serializers/base.py

@@ -67,6 +67,16 @@ def _patched_reverse(viewname, request=None, args=None, kwargs=None, **extra):
 class HrefPrnFieldMixin:
     """A mixin to configure related fields to generate relative hrefs and accept PRNs."""
 
+    def use_pk_only_optimization(self):
+        """Disable DRF's PK-only optimization when domains are enabled.
+
+        DRF's optimization passes a PKOnlyObject (no pulp_domain) to get_url,
+        causing _reverse to fall back to the default domain.
+        """
+        if settings.DOMAIN_ENABLED:
+            return False
+        return super().use_pk_only_optimization()
+
     def get_url(self, obj, view_name, request, *args, **kwargs):
         # Use the Pulp reverse method to display relative hrefs.
         self.reverse = _reverse(obj)

pulpcore/tests/functional/api/test_workers.py

@@ -160,11 +160,12 @@ def test_task_schedule_domain(domain_factory, pulpcore_bindings):
                 break
 
         assert task_schedules is not None and task_schedules.results[0].last_task is not None
-        assert f"/{domain_name}/" in task_schedules.results[0].pulp_href
-        tasks = pulpcore_bindings.TasksApi.list(name=task_name, pulp_domain=domain_name)
-        assert tasks.count == 1
-        assert tasks.results[0].state == "completed"
-        assert f"/{domain_name}/" in tasks.results[0].pulp_href
+        ts = task_schedules.results[0]
+        assert f"/{domain_name}/" in ts.pulp_href
+        assert f"/{domain_name}/" in ts.last_task
+        task = pulpcore_bindings.TasksApi.read(ts.last_task)
+        assert task.state == "completed"
+        assert f"/{domain_name}/" in task.pulp_href
     finally:
         subprocess.run(
             [