code: def preview_view(self, context):
          
          view_to_render = 'author_view' if hasattr(self, 'author_view') else 'student_view'
          renderer = getattr(self, view_to_render)
          return renderer(context)
docs: Preview view - used by StudioContainerWithNestedXBlocksMixin to render nested xblocks in preview context.
          Default implementation uses author_view if available, otherwise falls back to student_view
          Child classes can override this method to control their presentation in preview context