Make it clear that get_course_for_item is only a helper method in mongo modulestore.

common/lib/xmodule/xmodule/modulestore/mongo/base.py

@@ -681,7 +681,7 @@ class MongoModuleStore(ModuleStoreBase):
         # we should remove this once we can break this reference from the course to static tabs
         # TODO move this special casing to app tier (similar to attaching new element to parent)
         if location.category == 'static_tab':
-            course = self.get_course_for_item(location)
+            course = self._get_course_for_item(location)
             existing_tabs = course.tabs or []
             existing_tabs.append({
                 'type': 'static_tab',
@@ -701,7 +701,7 @@ class MongoModuleStore(ModuleStoreBase):
             self.modulestore_update_signal.send(self, modulestore=self, course_id=course_id,
                                                 location=location)
 
-    def get_course_for_item(self, location, depth=0):
+    def _get_course_for_item(self, location, depth=0):
         '''
         VS[compat]
         cdodge: for a given Xmodule, return the course that it belongs to
@@ -790,7 +790,7 @@ class MongoModuleStore(ModuleStoreBase):
         # we should remove this once we can break this reference from the course to static tabs
         loc = Location(location)
         if loc.category == 'static_tab':
-            course = self.get_course_for_item(loc)
+            course = self._get_course_for_item(loc)
             existing_tabs = course.tabs or []
             for tab in existing_tabs:
                 if tab.get('url_slug') == loc.name:
@@ -818,7 +818,7 @@ class MongoModuleStore(ModuleStoreBase):
         # we should remove this once we can break this reference from the course to static tabs
         if location.category == 'static_tab':
             item = self.get_item(location)
-            course = self.get_course_for_item(item.location)
+            course = self._get_course_for_item(item.location)
             existing_tabs = course.tabs or []
             course.tabs = [tab for tab in existing_tabs if tab.get('url_slug') != location.name]
             # Save the updates to the course to the MongoKeyValueStore