Optimize test course creation with bulk_operations.

Use bulk operations to both minimize the number of writes
to MongoDB, as well as to suppress signals which could
trigger things like search indexing or course structure
caching.

common/lib/xmodule/xmodule/modulestore/tests/django_utils.py

@@ -371,7 +371,7 @@ class ModuleStoreTestCase(TestCase):
         """
         Create an equivalent to the toy xml course
         """
-#        with self.store.bulk_operations(self.store.make_course_key(org, course, run)):
+        with self.store.bulk_operations(self.store.make_course_key(org, course, run), emit_signals=False):
             self.toy_loc = self.create_sample_course(  # pylint: disable=attribute-defined-outside-init
                 org, course, run, TOY_BLOCK_INFO_TREE,
                 {

common/lib/xmodule/xmodule/modulestore/tests/factories.py

@@ -99,7 +99,11 @@ class CourseFactory(XModuleFactory):
     # pylint: disable=unused-argument
     @classmethod
     def _create(cls, target_class, **kwargs):
-
+        """
+        Create and return a new course. For performance reasons, we do not emit
+        signals during this process, but if you need signals to run, you can
+        pass `emit_signals=True` to this method.
+        """
         # All class attributes (from this class and base classes) are
         # passed in via **kwargs. However, some of those aren't actual field values,
         # so pop those off for use separately
@@ -110,12 +114,15 @@ class CourseFactory(XModuleFactory):
         name = kwargs.get('name', kwargs.get('run', Location.clean(kwargs.get('display_name'))))
         run = kwargs.pop('run', name)
         user_id = kwargs.pop('user_id', ModuleStoreEnum.UserID.test)
+        emit_signals = kwargs.get('emit_signals', False)
 
         # Pass the metadata just as field=value pairs
         kwargs.update(kwargs.pop('metadata', {}))
         default_store_override = kwargs.pop('default_store', None)
 
         with store.branch_setting(ModuleStoreEnum.Branch.draft_preferred):
+            course_key = store.make_course_key(org, number, run)
+            with store.bulk_operations(course_key, emit_signals=emit_signals):
                 if default_store_override is not None:
                     with store.default_store(default_store_override):
                         new_course = store.create_course(org, number, run, user_id, fields=kwargs)

common/lib/xmodule/xmodule/modulestore/tests/utils.py

@@ -149,7 +149,7 @@ class ProceduralCourseTestMixin(object):
     """
     Contains methods for testing courses generated procedurally
     """
-    def populate_course(self, branching=2):
+    def populate_course(self, branching=2, emit_signals=False):
         """
         Add k chapters, k^2 sections, k^3 verticals, k^4 problems to self.course (where k = branching)
         """
@@ -172,4 +172,5 @@ class ProceduralCourseTestMixin(object):
                 )
                 descend(child, stack[1:])
 
+        with self.store.bulk_operations(self.course.id, emit_signals=emit_signals):
             descend(self.course, ['chapter', 'sequential', 'vertical', 'problem'])