Magento自定义类别属性未保存

https://www.ashsmith.io/2013/03/quick-tip-adding-custom-category-attributes-to-magento/使用这个链接，我设置了我的自定义类别属性，它确实显示在后端，但不会保存，这样我就可以在前端检索并显示值。

var转储显示如下：

object(Mage_Catalog_Model_Category)[19]
protected '_eventPrefix' => string 'catalog_category' (length=16)
protected '_eventObject' => string 'category' (length=8)
protected '_cacheTag' => string 'catalog_category' (length=16)
protected '_useFlatResource' => boolean true
private '_designAttributes' => 
array (size=6)
  0 => string 'custom_design' (length=13)
  1 => string 'custom_design_from' (length=18)
  2 => string 'custom_design_to' (length=16)
  3 => string 'page_layout' (length=11)
  4 => string 'custom_layout_update' (length=20)
  5 => string 'custom_apply_to_products' (length=24)
protected '_treeModel' => null
protected '_urlModel' => null
protected '_defaultValues' => 
array (size=0)
  empty
protected '_storeValuesFlags' => 
array (size=0)
  empty
protected '_lockedAttributes' => 
array (size=0)
  empty
protected '_isDeleteable' => boolean true
protected '_isReadonly' => boolean false
protected '_resourceName' => string 'catalog/category_flat' (length=21)
protected '_resource' => null
protected '_resourceCollectionName' => string   'catalog/category_flat_collection' (length=32)
protected '_dataSaveAllowed' => boolean true
protected '_isObjectNew' => null
protected '_data' => 
array (size=37)
  'entity_id' => string '321' (length=3)
  'parent_id' => string '2' (length=1)
  'created_at' => string '2015-02-02 14:50:55' (length=19)
  'updated_at' => string '2015-02-23 12:33:52' (length=19)
  'path' => string '1/2/321' (length=7)
  'position' => string '2' (length=1)
  'level' => string '2' (length=1)
  'children_count' => string '23' (length=2)
  'store_id' => string '1' (length=1)
  'all_children' => null
  'available_sort_by' => null
  'children' => null
  'custom_apply_to_products' => string '0' (length=1)
  'custom_design' => null
  'custom_design_from' => null
  'custom_design_to' => null
  'custom_layout_update' => null
  'custom_use_parent_settings' => string '0' (length=1)
  'default_sort_by' => null
  'description' => string '<div><img class="catimage" src="/skin/frontend/waterlee-boilerplate/default/images/columbarium-binnen.jpg" />
<div class="catdescription">
 <div class="cattitle"><h1>Urnen</h1></div>
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed porta arcu vel dictum volutpat. Praesent molestie dolor at vehicula consectetur. Praesent dictum, ipsum ac porta dignissim, arcu purus mattis tellus, tempus semper ex ligula quis magna. per inceptos himenaeos.</div>
</div>
<p style="text-align: center;"><span>Uitv'... (length=771)
  'display_mode' => string 'PAGE' (length=4)
  'filter_price_range' => null
  'image' => null
  'include_in_menu' => string '1' (length=1)
  'is_active' => string '1' (length=1)
  'is_anchor' => string '0' (length=1)
  'landing_page' => string '15' (length=2)
  'meta_description' => string 'a' (length=1)
  'meta_keywords' => null
  'meta_title' => null
  'name' => string 'Urnen' (length=5)
  'page_layout' => null
  'path_in_store' => null
  'thumbnail' => null
  'url_key' => string 'urnen' (length=5)
  'url_path' => string 'urnen-17.html' (length=13)
  'path_ids' => 
    array (size=3)
      0 => string '1' (length=1)
      1 => string '2' (length=1)
      2 => string '321' (length=3)
  protected '_hasDataChanges' => boolean true
  protected '_origData' => 
array (size=36)
  'entity_id' => string '321' (length=3)
  'parent_id' => string '2' (length=1)
  'created_at' => string '2015-02-02 14:50:55' (length=19)
  'updated_at' => string '2015-02-23 12:33:52' (length=19)
  'path' => string '1/2/321' (length=7)
  'position' => string '2' (length=1)
  'level' => string '2' (length=1)
  'children_count' => string '23' (length=2)
  'store_id' => string '1' (length=1)
  'all_children' => null
  'available_sort_by' => null
  'children' => null
  'custom_apply_to_products' => string '0' (length=1)
  'custom_design' => null
  'custom_design_from' => null
  'custom_design_to' => null
  'custom_layout_update' => null
  'custom_use_parent_settings' => string '0' (length=1)
  'default_sort_by' => null
  'description' => string '<div><img class="catimage" src="/skin/frontend/waterlee-boilerplate/default/images/columbarium-binnen.jpg" />
 <div class="catdescription">
 <div class="cattitle"><h1>Urnen</h1></div>
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed porta arcu vel dictum volutpat. Praesent molestie dolor at vehicula consectetur. Praesent dictum, ipsum ac porta dignissim, arcu purus mattis tellus, tempus semper ex ligula quis magna. per inceptos himenaeos.</div>
 </div>
 <p style="text-align: center;"><span>Uitv'... (length=771)
  'display_mode' => string 'PAGE' (length=4)
  'filter_price_range' => null
  'image' => null
  'include_in_menu' => string '1' (length=1)
  'is_active' => string '1' (length=1)
  'is_anchor' => string '0' (length=1)
  'landing_page' => string '15' (length=2)
  'meta_description' => string 'a' (length=1)
  'meta_keywords' => null
  'meta_title' => null
  'name' => string 'Urnen' (length=5)
  'page_layout' => null
  'path_in_store' => null
  'thumbnail' => null
  'url_key' => string 'urnen' (length=5)
  'url_path' => string 'urnen-17.html' (length=13)
  protected '_idFieldName' => string 'entity_id' (length=9)
  protected '_isDeleted' => boolean false
  protected '_oldFieldsMap' => 
array (size=0)
  empty
 protected '_syncFieldsMap' => 
array (size=0)
  empty