Question

我开始使用'order_insertion_by'更改django-mptt中的默认排序。

到目前为止，我没有在我的本地发现问题，但我的测试失败了。

背景我有测试夹具，可以在树形结构中创建大约10个对象和两棵树。

我在模型中添加了“order_insertion_by”。当我运行测试时，它失败了，因为树结构现在很乱。

但是如果我进行树重建，只需重新加载测试夹具后，树结构就可以了。

这是夹具tests.py：

class TestPostCreationAndRetrival(LiveServerTestCase):

    headers = {'Accept': 'application/json; indent=4'}

    def fixture(self):
        self.school = Community.objects.create(name='TestSchool')
        self.school2 = Community.objects.create(name='NewTestschool')
        self.classroom1 = Community.objects.create(parent=self.school,
            name = 'Classroom1')
        self.classroom2 = Community.objects.create(parent=self.school,
            name = 'Classroom2')
        self.subclassroom1 = Community.objects.create(
            parent=self.classroom1,
            name='Subclassroom1')
        self.subclassroom2 = Community.objects.create(
            parent=self.classroom2,
            name='Subclassroom2')
        self.subclassroom3 = Community.objects.create(
            parent=self.classroom1,
            name='Subclassroom3')
        self.subclassroom4 = Community.objects.create(
            parent=self.classroom2,
            name='Subclassroom4')

        self.gou1 = Community.objects.create(
            parent=self.subclassroom1,
            name='GOC1')
        self.gou2 = Community.objects.create(
            parent=self.subclassroom2,
            name='GOC2')

def setUp(self):
    self.fixture()
    # This prints empty qs [] while I gave children in above fixture.
    print Community.objects.get(name='TestSchool').get_descendants()
    # Let's rebuild the tree
    Community.tree.rebuild()
    print Community.objects.get(name='TestSchool').get_descendants()
    # prints all the descendants just fine.

在models.py：

class Community(MPTTModel):
    tree = TreeManager()
    parent = models.ForeignKey('self', verbose_name=_(u'Parent'),
        null=True, blank=True, related_name='children')

    name = models.CharField(verbose_name=_(u'Name'),
        max_length=100)
    slug = models.SlugField(verbose_name=_(u'Slug'),
        max_length=100)

    objects = CommunityManager()

   class MPTTMeta:
       order_insertion_by = ['name']

这引发了一些问题：

我认为' order_insertion_by '强制在创建/更新对象时更新/重建树。但这并不一致，您必须在模型创建/更新后重建，以确保树处于良好状态。是这样吗？
在我的测试用例中，为什么最初的树乱了？我只创建了大约10个具有树形结构的对象。

django-mptt order_insertion_by和树重建

0 个答案: