如何使用MPTT为django让所有孩子？

Question

我正试图让所有类别的孩子:

def list_sub(self, category_name):
   # this will return the parent if exists
   category = Category.objects.filter(seo_title__exact = seo_title).filter(lang__exact = 'pt-PT').filter(level__exact = 1)

   if category:
      # but this doesn't work and in the documentation there are no examples
      # of how to get it. See link about the method
      sub_categories = category.get_children()

http://django-mptt.github.com/django-mptt/models.html#get-children

UPDATE1:

qc = Category.objects.filter(seo_title__exact = cat).filter(lang__exact = 'pt-PT').filter(level__exact = 1)
category = qc.get()

if category:
    qsc = category.get_children()
    sub_categories = qsc.get()

现在我收到这个错误:"get()返回多个类别 - 它返回7!查找参数是{}"

谢谢

Answer 1

你的问题不在于MPTT.问题是它category是一个查询集,而不是一个实例 - get_children()是一个模型方法,而不是一个查询集方法.

用get而不是filter.