Responses to comments on https://github.com/edx/edx-platform/pull/3539

Conflicts:
	common/lib/xmodule/xmodule/modulestore/locations.py

cms/djangoapps/contentstore/views/course.py

@@ -291,16 +291,6 @@ def create_new_course(request):
     try:
         course_key = SlashSeparatedCourseKey(org, number, run)
 
-        # see if the course already exists
-        existing_course_exists = False
-        try:
-            existing_course_exists = modulestore('direct').has_course(course_key, ignore_case=True)
-        except InsufficientSpecificationError:
-            pass
-
-        if existing_course_exists:
-            raise InvalidLocationError()
-
         # instantiate the CourseDescriptor and then persist it
         # note: no system to pass
         if display_name is None:
@@ -310,7 +300,8 @@ def create_new_course(request):
 
         # Set a unique wiki_slug for newly created courses. To maintain active wiki_slugs for
         # existing xml courses this cannot be changed in CourseDescriptor.
-        ## TODO get rid of defining wiki slug in this org/course/run specific way
+        # # TODO get rid of defining wiki slug in this org/course/run specific way and reconcile
+        # w/ xmodule.course_module.CourseDescriptor.__init__
         wiki_slug = u"{0}.{1}.{2}".format(course_key.org, course_key.course, course_key.run)
         definition_data = {'wiki_slug': wiki_slug}
 
@@ -325,26 +316,12 @@ def create_new_course(request):
         fields.update(metadata)
 
         # Creating the course raises InvalidLocationError if an existing course with this org/name is found
-        modulestore('direct').create_course(
+        new_course = modulestore('direct').create_course(
             course_key.org,
             course_key.offering,
             fields=fields,
         )
 
-        new_course = modulestore('direct').get_course(course_key)
-
-        # clone a default 'about' overview module as well
-        dest_about_location = new_course.location.replace(
-            category='about',
-            name='overview'
-        )
-        overview_template = AboutDescriptor.get_template('overview.yaml')
-        modulestore('direct').create_and_save_xmodule(
-            dest_about_location,
-            system=new_course.system,
-            definition_data=overview_template.get('data')
-        )
-
         # can't use auth.add_users here b/c it requires request.user to already have Instructor perms in this course
         # however, we can assume that b/c this user had authority to create the course, the user can add themselves
         CourseInstructorRole(new_course.id).add_users(request.user)

common/lib/xmodule/xmodule/modulestore/locations.py

@@ -2,6 +2,7 @@
 
 import logging
 import re
+from bson.son import SON
 
 from opaque_keys import InvalidKeyError, OpaqueKey
 
@@ -240,6 +241,25 @@ class LocationBase(object):
     def course_key(self):
         return SlashSeparatedCourseKey(self.org, self.course, self.run)
 
+    def to_deprecated_son(self, prefix='', tag='i4x'):
+        """
+        Returns a SON object that represents this location
+        """
+        # adding tag b/c deprecated form used it
+        son = SON({prefix + 'tag': tag})
+        for field_name in self.KEY_FIELDS:
+            # Temporary filtering of run field because deprecated form left it out
+            if field_name != 'run':
+                son[prefix + field_name] = getattr(self, field_name)
+        return son
+
+    @classmethod
+    def _from_deprecated_son(cls, id_dict, run):
+        """
+        Return the Location decoding this id_dict and run
+        """
+        return cls(id_dict['org'], id_dict['course'], run, id_dict['category'], id_dict['name'], id_dict['revision'])
+
 
 class Location(LocationBase, UsageKey, DefinitionKey):
     """
@@ -313,6 +333,14 @@ class AssetLocation(LocationBase, AssetKey):
         """
         return AssetLocation(course_key.org, course_key.course, course_key.run, self.category, self.name, self.revision)
 
+    def to_deprecated_list_repr(self):
+        """
+        Thumbnail locations are stored as lists [c4x, org, course, thumbnail, path, None] in contentstore.mongo
+        That should be the only use of this method, but the method is general enough to provide the pre-opaque
+        Location fields as an array in the old order with the tag.
+        """
+        return ['c4x', self.org, self.course, self.block_type, self.name, None]
+
 
 class i4xEncoder(json.JSONEncoder):
     """

lms/djangoapps/courseware/tests/test_video_handlers.py

@@ -21,6 +21,7 @@ from xmodule.video_module.transcripts_utils import (
     TranscriptsGenerationException,
 )
 from xmodule.modulestore.mongo.base import MongoModuleStore
+from xmodule.modulestore.locations import AssetLocation
 
 SRT_content = textwrap.dedent("""
         0
@@ -63,7 +64,7 @@ def _clear_assets(location):
 
     assets, __ = store.get_all_content_for_course(location.course_key)
     for asset in assets:
-        asset_location = MongoModuleStore._location_from_id(asset["_id"], location.course_key.run)
+        asset_location = AssetLocation._from_deprecated_son(asset["_id"], location.course_key.run)
         del_cached_content(asset_location)
         mongo_id = StaticContent.get_id_from_location(asset_location)
         store.delete(mongo_id)