Comparison of old vs new course pack import

new_import.py

trees = course_pack.trees.all().values_list('data', flat=True)

old_import.py

    for module in course_pack_modules:
        tree = Folder()

        for item in course_pack_modules[module]:
            item = item.cast()
            #determine the parent to insert the item into; either a folder, or the tree itself
            folder_name = folder_memberships.get(item.key_str)
            if not folder_name:
                #if item has no folder, parent is the tree
                parent = tree
            elif tree.get_item(folder_name):
                #if folder already exists, get it
                parent = tree.get_item(folder_name)
            else:
                #if folder does not yet exist, add it
                parent = tree.initialize_type("folder", folder_name)
                tree.add_item(parent)

            #create and the item to the parent
            tree_item = tree.initialize_type("item", item.tree_id())
            tree_item.title = item.display_name
            parent.add_item(tree_item)

        data[module] = tree.serialize()