Studio support for creating and editing libraries (PR 6046)

SOL-1, SOL-2, SOL-3

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

@@ -5,7 +5,7 @@ Module for the dual-branch fall-back Draft->Published Versioning ModuleStore
 from xmodule.modulestore.split_mongo.split import SplitMongoModuleStore, EXCLUDE_ALL
 from xmodule.exceptions import InvalidVersionError
 from xmodule.modulestore import ModuleStoreEnum
-from xmodule.modulestore.exceptions import InsufficientSpecificationError
+from xmodule.modulestore.exceptions import InsufficientSpecificationError, ItemNotFoundError
 from xmodule.modulestore.draft_and_published import (
     ModuleStoreDraftAndPublished, DIRECT_ONLY_CATEGORIES, UnsupportedRevisionError
 )
@@ -411,7 +411,11 @@ class DraftVersioningModuleStore(SplitMongoModuleStore, ModuleStoreDraftAndPubli
         pass
 
     def _get_head(self, xblock, branch):
-        course_structure = self._lookup_course(xblock.location.course_key.for_branch(branch)).structure
+        try:
+            course_structure = self._lookup_course(xblock.location.course_key.for_branch(branch)).structure
+        except ItemNotFoundError:
+            # There is no published version xblock container, e.g. Library
+            return None
         return self._get_block_from_structure(course_structure, BlockKey.from_usage_key(xblock.location))
 
     def _get_version(self, block):

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

@@ -206,3 +206,14 @@ class TestLibraries(MixedSplitTestCase):
             with patch('xmodule.x_module.DescriptorSystem.applicable_aside_types', lambda self, block: []):
                 result = library.render(AUTHOR_VIEW, context)
         self.assertIn(message, result.content)
+
+    def test_xblock_in_lib_have_published_version_returns_false(self):
+        library = LibraryFactory.create(modulestore=self.store)
+        block = ItemFactory.create(
+            category="html",
+            parent_location=library.location,
+            user_id=self.user_id,
+            publish_item=False,
+            modulestore=self.store,
+        )
+        self.assertFalse(self.store.has_published_version(block))