与post_save信号

class Category(MPTTModel): 
    name = models.CharField(max_length=256) 
    parent = TreeForeignKey('self', null=True, blank=True, related_name='children', db_index=True) 

    class MPTTMeta: 
     order_insertion_by = ['name'] 



@receiver(post_save) 
def translate_name(sender, instance, created, **kwargs): 
    if sender not in [Category]: 
     return 
    if created: 
     # some operations with 'name_ru' 'name_en' fields (since django-modeltranslation) 
     instance.save(update_fields=['name'])

django_mptt模型提出了“的节点可能不会作出任何其后代的孩子”与post_save信号

node  <Category: Obj3> 
right  3L 
target  <Category: Obj2> 
level  1L 
self  <mptt.managers.TreeManager object at 0x108a76d10> 
width  2L 
new_tree_id 2L 
tree_id  2L 
position u'last-child' 
left  2L

当我排除这种post_save处理的分类模型 - 一切正常

Django==1.8.2 
django-mptt==0.7.4

任何意见或解决办法...

来源

2015-06-05 madzohan

def move_to(self, target, position='first-child'): 
    """ 
    Convenience method for calling ``TreeManager.move_node`` with this 
    model instance. 
    NOTE: This is a low-level method; it does NOT respect 
    ``MPTTMeta.order_insertion_by``. 
    In most cases you should just move the node yourself by setting node.parent. 
    """

if instance.parent: 
    instance.move_to(instance.parent) 
instance.save(update_fields=updated_field_list)

来源

2015-06-05 13:36:20 madzohan

与post_save信号

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