fix(epics): use actual group_id for save/delete operations on nested epics

JohnVillalovos · JohnVillalovos · commit 27bd80c1330b · 2025-10-21T16:29:21.000-07:00
When an epic belonging to a subgroup is retrieved through a parent group's epic listing, save() and delete() operations would fail because they used the parent group's path instead of the epic's actual group_id. This commit overrides save() and delete() methods in GroupEpic to use the epic's group_id attribute to construct the correct API path, ensuring operations work correctly regardless of how the epic was retrieved. Also add the ability to pass a custom path using `_pg_custom_path` to the `UpdateMixin.update()` and `SaveMixin.save()` methods. This allowed the override of the `update()` method to re-use the `SaveMixin.save()` method. Closes: #3261
diff --git a/gitlab/mixins.py b/gitlab/mixins.py
@@ -314,6 +314,8 @@ def update(
             path = self.path
         else:
             path = f"{self.path}/{utils.EncodedId(id)}"
+        if "_pg_custom_path" in kwargs:
+            path = kwargs.pop("_pg_custom_path")
 
         excludes = []
         if self._obj_cls is not None and self._obj_cls._id_attr is not None:
diff --git a/gitlab/v4/objects/epics.py b/gitlab/v4/objects/epics.py
@@ -2,6 +2,7 @@
 
 from typing import Any, TYPE_CHECKING
 
+import gitlab.utils
 from gitlab import exceptions as exc
 from gitlab import types
 from gitlab.base import RESTObject
@@ -24,11 +25,69 @@
 
 class GroupEpic(ObjectDeleteMixin, SaveMixin, RESTObject):
     _id_attr = "iid"
+    manager: GroupEpicManager
 
     issues: GroupEpicIssueManager
     resourcelabelevents: GroupEpicResourceLabelEventManager
     notes: GroupEpicNoteManager
 
+    def _epic_path(self) -> str:
+        """Return the API path for this epic using its real group."""
+        if not hasattr(self, "group_id") or self.group_id is None:
+            raise AttributeError(
+                "Cannot compute epic path: attribute 'group_id' is missing."
+            )
+        encoded_group_id = gitlab.utils.EncodedId(self.group_id)
+        return f"/groups/{encoded_group_id}/epics/{self.encoded_id}"
+
+    @exc.on_http_error(exc.GitlabUpdateError)
+    def save(self, **kwargs: Any) -> dict[str, Any] | None:
+        """Save the changes made to the object to the server.
+
+        The object is updated to match what the server returns.
+
+        This method uses the epic's group_id attribute to construct the correct
+        API path. This is important when the epic was retrieved from a parent
+        group but actually belongs to a sub-group.
+
+        Args:
+            **kwargs: Extra options to send to the server (e.g. sudo)
+
+        Returns:
+            The new object data (*not* a RESTObject)
+
+        Raises:
+            GitlabAuthenticationError: If authentication is not correct
+            GitlabUpdateError: If the server cannot perform the request
+        """
+        # Use the epic's actual group_id to construct the correct path.
+        path = self._epic_path()
+
+        # Call SaveMixin.save() method
+        return super().save(_pg_custom_path=path, **kwargs)
+
+    @exc.on_http_error(exc.GitlabDeleteError)
+    def delete(self, **kwargs: Any) -> None:
+        """Delete the object from the server.
+
+        This method uses the epic's group_id attribute to construct the correct
+        API path. This is important when the epic was retrieved from a parent
+        group but actually belongs to a sub-group.
+
+        Args:
+            **kwargs: Extra options to send to the server (e.g. sudo)
+
+        Raises:
+            GitlabAuthenticationError: If authentication is not correct
+            GitlabDeleteError: If the server cannot perform the request
+        """
+        if TYPE_CHECKING:
+            assert self.encoded_id is not None
+
+        # Use the epic's actual group_id to construct the correct path.
+        path = self._epic_path()
+        self.manager.gitlab.http_delete(path, **kwargs)
+
 
 class GroupEpicManager(CRUDMixin[GroupEpic]):
     _path = "/groups/{group_id}/epics"
diff --git a/tests/functional/api/test_epics.py b/tests/functional/api/test_epics.py
@@ -1,5 +1,9 @@
+import uuid
+
 import pytest
 
+from tests.functional import helpers
+
 pytestmark = pytest.mark.gitlab_premium
 
 
@@ -30,3 +34,39 @@ def test_epic_notes(epic):
 
     epic.notes.create({"body": "Test note"})
     assert epic.notes.list()
+
+
+def test_epic_save_from_parent_group_updates_subgroup_epic(gl, group):
+    subgroup_id = uuid.uuid4().hex
+    subgroup = gl.groups.create(
+        {
+            "name": f"subgroup-{subgroup_id}",
+            "path": f"sg-{subgroup_id}",
+            "parent_id": group.id,
+        }
+    )
+
+    nested_epic = subgroup.epics.create(
+        {"title": f"Nested epic {subgroup_id}", "description": "Nested epic"}
+    )
+
+    try:
+        fetched_epics = group.epics.list(search=nested_epic.title)
+        assert fetched_epics, "Expected to discover nested epic via parent group list"
+
+        fetched_epic = next(
+            (epic for epic in fetched_epics if epic.id == nested_epic.id), None
+        )
+        assert (
+            fetched_epic is not None
+        ), "Parent group listing did not include nested epic"
+
+        new_label = f"nested-{subgroup_id}"
+        fetched_epic.labels = [new_label]
+        fetched_epic.save()
+
+        refreshed_epic = subgroup.epics.get(nested_epic.iid)
+        assert new_label in refreshed_epic.labels
+    finally:
+        helpers.safe_delete(nested_epic)
+        helpers.safe_delete(subgroup)
diff --git a/tests/unit/objects/test_epics.py b/tests/unit/objects/test_epics.py
@@ -0,0 +1,44 @@
+import responses
+
+from gitlab.v4.objects.epics import GroupEpic
+
+
+def _build_epic(manager, iid=3, group_id=2, title="Epic"):
+    data = {"iid": iid, "group_id": group_id, "title": title}
+    return GroupEpic(manager, data)
+
+
+def test_group_epic_save_uses_actual_group_path(group):
+    epic_manager = group.epics
+    epic = _build_epic(epic_manager, title="Original")
+    epic.title = "Updated"
+
+    with responses.RequestsMock() as rsps:
+        rsps.add(
+            method=responses.PUT,
+            url="http://localhost/api/v4/groups/2/epics/3",
+            json={"iid": 3, "group_id": 2, "title": "Updated"},
+            content_type="application/json",
+            status=200,
+            match=[responses.matchers.json_params_matcher({"title": "Updated"})],
+        )
+
+        epic.save()
+
+    assert epic.title == "Updated"
+
+
+def test_group_epic_delete_uses_actual_group_path(group):
+    epic_manager = group.epics
+    epic = _build_epic(epic_manager)
+
+    with responses.RequestsMock() as rsps:
+        rsps.add(
+            method=responses.DELETE,
+            url="http://localhost/api/v4/groups/2/epics/3",
+            status=204,
+        )
+
+        epic.delete()
+
+    assert len(epic._updated_attrs) == 0
