Improve code clarity.

cms/djangoapps/contentstore/views/component.py

@@ -23,7 +23,6 @@ from xblock.exceptions import NoSuchHandlerError
 from xblock.fields import Scope
 from xblock.plugin import PluginMissingError
 from xblock.runtime import Mixologist
-from xmodule.x_module import prefer_xmodules
 
 from lms.lib.xblock.runtime import unquote_slashes
 
@@ -311,19 +310,19 @@ def container_handler(request, tag=None, package_id=None, branch=None, version_g
         except ItemNotFoundError:
             return HttpResponseBadRequest()
 
-        parent_xblocks = []
+        ancestor_xblocks = []
         parent = get_parent_xblock(xblock)
         while parent and parent.category != 'sequential':
-            parent_xblocks.append(parent)
+            ancestor_xblocks.append(parent)
             parent = get_parent_xblock(parent)
 
-        parent_xblocks.reverse()
+        ancestor_xblocks.reverse()
 
         return render_to_response('container.html', {
             'context_course': course,
             'xblock': xblock,
             'xblock_locator': locator,
-            'parent_xblocks': parent_xblocks,
+            'ancestor_xblocks': ancestor_xblocks,
         })
     else:
         return HttpResponseBadRequest("Only supports html requests")

cms/djangoapps/contentstore/views/tests/test_item.py

@@ -151,6 +151,8 @@ class GetItem(ItemTest):
         self.assertIn('wrapper-xblock', html)
         self.assertRegexpMatches(
             html,
+            # The instance of the wrapper class will have an auto-generated ID (wrapperxxx). Allow anything
+            # for the 3 characters after wrapper.
             (r'"/container/MITx.999.Robot_Super_Course/branch/published/block/wrapper.{3}" class="action-button">\s*'
              '<span class="action-button-text">View</span>')
         )

cms/templates/container.html

@@ -47,13 +47,13 @@ xblock_info = {
     <header class="mast has-actions has-navigation">
         <h1 class="page-header">
             <small class="navigation navigation-parents">
-                % for parent in parent_xblocks:
+                % for ancestor in ancestor_xblocks:
                     <%
-                    parent_url = xblock_studio_url(parent, context_course)
+                    ancestor_url = xblock_studio_url(ancestor, context_course)
                     %>
-                    % if parent_url:
-                    <a href="${parent_url}"
-                       class="navigation-link navigation-parent">${parent.display_name_with_default | h}</a>
+                    % if ancestor_url:
+                    <a href="${ancestor_url}"
+                       class="navigation-link navigation-parent">${ancestor.display_name_with_default | h}</a>
                     % endif
                 % endfor
                 <a href="#" class="navigation-link navigation-current">${xblock.display_name_with_default | h}</a>