Remove old parts of xmodules used in sketch

common/lib/xmodule/xmodule/seq_module.py

@@ -3,8 +3,6 @@ import logging
 
 from lxml import etree
 
-from .mako_module import MakoModuleDescriptor
-from .xml_module import XmlDescriptor
 from .xmodule import XModule
 from .progress import Progress
 from .exceptions import NotFoundError
@@ -110,30 +108,3 @@ class SequenceModule(XModule):
                 new_class = c
         return new_class
 
-
-class SequenceDescriptor(MakoModuleDescriptor, XmlDescriptor):
-    mako_template = 'widgets/sequence-edit.html'
-    module_class = SequenceModule
-
-    stores_state = True # For remembering where in the sequence the student is
-
-    template_dir_name = 'sequence'
-
-    @classmethod
-    def definition_from_xml(cls, xml_object, system):
-        children = []
-        for child in xml_object:
-            try:
-                children.append(system.process_xml(etree.tostring(child)).location.url())
-            except:
-                log.exception("Unable to load child when parsing Sequence. Continuing...")
-                continue
-        return {'children': children}
-
-    def definition_to_xml(self, resource_fs):
-        xml_object = etree.Element('sequential')
-        for child in self.get_children():
-            xml_object.append(
-                etree.fromstring(child.export_to_xml(resource_fs)))
-        return xml_object
-

common/lib/xmodule/xmodule/structure_module.py

@@ -8,11 +8,11 @@ class Usage(namedtuple('Usage', 'id source settings children')):
 
     @classmethod
     def create_usage(cls, source):
-        xmodule = xmodule.get_module(source)
+        #module = xmodule.get_module(source)
         return Usage(
-            uuid(),
-            xmodule.id,
-            xmodule.course_settings,
+            "UUID",
+            "Foo",
+            {},
             [],
         )
 
@@ -31,6 +31,9 @@ def load_usage(usage_tree):
     settings: default settings values set by the source xmodule
     children: child usages
     """
+    if usage_tree is None:
+        return None
+
     usage_tree['children'] = [load_usage(child) for child in usage_tree['children']]
     return Usage(**usage_tree)
 
@@ -44,5 +47,5 @@ class StructureModule(XModule):
     @property
     def usage_tree(self):
         if self._usage_tree is None:
-            self._usage_tree = load_usage(self.content['usage_tree'])
+            self._usage_tree = load_usage(self.content.get('usage_tree', None))
         return self._usage_tree

common/lib/xmodule/xmodule/vertical_module.py

 from .xmodule import XModule, register_view
-from .seq_module import SequenceDescriptor
 from .progress import Progress
 from .module_resources import render_template
 
@@ -31,7 +30,3 @@ class VerticalModule(XModule):
             if c in child_classes:
                 new_class = c
         return new_class
-
-
-class VerticalDescriptor(SequenceDescriptor):
-    module_class = VerticalModule