Allow test_mixed_modulestore to be run without django setup

common/lib/xmodule/xmodule/modulestore/__init__.py

@@ -315,7 +315,8 @@ class BulkOperationsMixin(object):
         Sends out the signal that items have been published from within this course.
         """
         if self.signal_handler and bulk_ops_record.has_publish_item:
-            self.signal_handler.send("course_published", course_key=course_id)
+            # We remove the branch, because publishing always means copying from draft to published
+            self.signal_handler.send("course_published", course_key=course_id.for_branch(None))
             bulk_ops_record.has_publish_item = False
 
     def send_bulk_library_updated_signal(self, bulk_ops_record, library_id):
@@ -1345,22 +1346,6 @@ class ModuleStoreWriteBase(ModuleStoreReadBase, ModuleStoreWrite):
         parent.children.append(item.location)
         self.update_item(parent, user_id)
 
-    def _flag_publish_event(self, course_key):
-        """
-        Wrapper around calls to fire the course_published signal
-        Unless we're nested in an active bulk operation, this simply fires the signal
-        otherwise a publish will be signalled at the end of the bulk operation
-
-        Arguments:
-            course_key - course_key to which the signal applies
-        """
-        if self.signal_handler:
-            bulk_record = self._get_bulk_ops_record(course_key) if isinstance(self, BulkOperationsMixin) else None
-            if bulk_record and bulk_record.active:
-                bulk_record.has_publish_item = True
-            else:
-                self.signal_handler.send("course_published", course_key=course_key)
-
     def _flag_library_updated_event(self, library_key):
         """
         Wrapper around calls to fire the library_updated signal

common/lib/xmodule/xmodule/modulestore/draft_and_published.py

@@ -5,7 +5,7 @@ This module provides an abstraction for Module Stores that support Draft and Pub
 import threading
 from abc import ABCMeta, abstractmethod
 from contextlib import contextmanager
-from . import ModuleStoreEnum
+from . import ModuleStoreEnum, BulkOperationsMixin
 
 # Things w/ these categories should never be marked as version=DRAFT
 DIRECT_ONLY_CATEGORIES = ['course', 'chapter', 'sequential', 'about', 'static_tab', 'course_info']
@@ -62,7 +62,7 @@ class BranchSettingMixin(object):
             return self.default_branch_setting_func()
 
 
-class ModuleStoreDraftAndPublished(BranchSettingMixin):
+class ModuleStoreDraftAndPublished(BranchSettingMixin, BulkOperationsMixin):
     """
     A mixin for a read-write database backend that supports two branches, Draft and Published, with
     options to prefer Draft and fallback to Published.
@@ -112,6 +112,23 @@ class ModuleStoreDraftAndPublished(BranchSettingMixin):
         """
         raise NotImplementedError
 
+    def _flag_publish_event(self, course_key):
+        """
+        Wrapper around calls to fire the course_published signal
+        Unless we're nested in an active bulk operation, this simply fires the signal
+        otherwise a publish will be signalled at the end of the bulk operation
+
+        Arguments:
+            course_key - course_key to which the signal applies
+        """
+        if self.signal_handler:
+            bulk_record = self._get_bulk_ops_record(course_key) if isinstance(self, BulkOperationsMixin) else None
+            if bulk_record and bulk_record.active:
+                bulk_record.has_publish_item = True
+            else:
+                # We remove the branch, because publishing always means copying from draft to published
+                self.signal_handler.send("course_published", course_key=course_key.for_branch(None))
+
 
 class UnsupportedRevisionError(ValueError):
     """

common/lib/xmodule/xmodule/modulestore/split_mongo/mongo_connection.py

@@ -13,7 +13,13 @@ from time import time
 
 # Import this just to export it
 from pymongo.errors import DuplicateKeyError  # pylint: disable=unused-import
-from django.core.cache import get_cache, InvalidCacheBackendError
+
+try:
+    from django.core.cache import get_cache, InvalidCacheBackendError
+    DJANGO_AVAILABLE = True
+except ImportError:
+    DJANGO_AVAILABLE = False
+
 import dogstats_wrapper as dog_stats_api
 
 from contracts import check, new_contract
@@ -216,15 +222,16 @@ class CourseStructureCache(object):
     for set and get.
     """
     def __init__(self):
-        self.no_cache_found = False
+        self.cache = None
+        if DJANGO_AVAILABLE:
             try:
                 self.cache = get_cache('course_structure_cache')
             except InvalidCacheBackendError:
-            self.no_cache_found = True
+                pass
 
     def get(self, key, course_context=None):
         """Pull the compressed, pickled struct data from cache and deserialize."""
-        if self.no_cache_found:
+        if self.cache is None:
             return None
 
         with TIMER.timer("CourseStructureCache.get", course_context) as tagger:
@@ -245,7 +252,7 @@ class CourseStructureCache(object):
 
     def set(self, key, structure, course_context=None):
         """Given a structure, will pickle, compress, and write to cache."""
-        if self.no_cache_found:
+        if self.cache is None:
             return None
 
         with TIMER.timer("CourseStructureCache.set", course_context) as tagger: