addresses issue where branch information was not being stripped from child…

addresses issue where branch information was not being stripped from child blocks when serializing courses (PLAT-1794)

openedx/core/djangoapps/coursegraph/management/commands/tests/test_dump_to_neo4j.py

@@ -25,6 +25,7 @@ from openedx.core.djangoapps.coursegraph.tasks import (
     serialize_course,
     coerce_types,
     should_dump_course,
+    strip_branch_and_version,
 )
 from openedx.core.djangoapps.content.course_structures.signals import (
     listen_for_course_publish
@@ -262,6 +263,25 @@ class TestModuleStoreSerializer(TestDumpToNeo4jCommandBase):
         # the course has 7 "PARENT_OF" relationships and 3 "PRECEDES"
         self.assertEqual(len(relationships), 10)
 
+    def test_strip_version_and_branch(self):
+        """
+        Tests that the _strip_version_and_branch function strips the version
+        and branch from a location
+        """
+        location = self.course.id.make_usage_key(
+            'test_block_type', 'test_block_id'
+        ).for_branch(
+            'test_branch'
+        ).for_version('test_version')
+
+        self.assertIsNotNone(location.branch)
+        self.assertIsNotNone(location.version)
+
+        stripped_location = strip_branch_and_version(location)
+
+        self.assertIsNone(stripped_location.branch)
+        self.assertIsNone(stripped_location.version)
+
     @staticmethod
     def _extract_relationship_pairs(relationships, relationship_type):
         """
@@ -503,7 +523,7 @@ class TestModuleStoreSerializer(TestDumpToNeo4jCommandBase):
         """
         mock_get_command_last_run.return_value = last_command_run
         mock_get_course_last_published.return_value = last_course_published
-        mock_course_key = mock.Mock
+        mock_course_key = mock.Mock()
         mock_graph = mock.Mock()
         self.assertEqual(
             should_dump_course(mock_course_key, mock_graph),

openedx/core/djangoapps/coursegraph/tasks.py

@@ -144,6 +144,16 @@ def get_course_last_published(course_key):
     return course_last_published_date
 
 
+def strip_branch_and_version(location):
+    """
+    Removes the branch and version information from a location.
+    Args:
+        location: an xblock's location.
+    Returns: that xblock's location without branch and version information.
+    """
+    return location.for_branch(None)
+
+
 def serialize_course(course_id):
     """
     Serializes a course into py2neo Nodes and Relationships
@@ -170,15 +180,15 @@ def serialize_course(course_id):
             fields[field_name] = coerce_types(value)
 
         node = Node(block_type, 'item', **fields)
-        location_to_node[item.location.version_agnostic()] = node
+        location_to_node[strip_branch_and_version(item.location)] = node
 
     # create relationships
     relationships = []
     for item in items:
         previous_child_node = None
         for index, child in enumerate(item.get_children()):
-            parent_node = location_to_node.get(item.location.version_agnostic())
-            child_node = location_to_node.get(child.location.version_agnostic())
+            parent_node = location_to_node.get(strip_branch_and_version(item.location))
+            child_node = location_to_node.get(strip_branch_and_version(child.location))
 
             if parent_node is not None and child_node is not None:
                 child_node["index"] = index