django mptt订单插入和树重建

我开始使用“

order\u insertion\u by

”来更改django mptt中的默认顺序

到目前为止，我还没有在本地服务器上发现问题，但我的测试失败了

背景： 我有一个测试夹具，它在树结构和两棵树中创建了大约10个对象

我在模型中添加了“

order\u insertion\u by

”。当我运行测试时，它失败了，因为树结构现在很混乱

但若我在重新加载测试夹具之后重建树，那个么树结构就可以了

这里是fixture

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.

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']

在

models.py中

：

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.

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']

这带来了一些问题：

我认为“按插入顺序”在创建/更新对象时强制更新/重建树。但这并不一致，您必须在模型创建/更新后自行重建，以确保树处于良好状态。是这样吗

在我的测试用例中，为什么最初的树是混乱的？我只创建了大约10个具有树结构的对象

---

社区

模型是如何定义的？@arocks-Hey添加了模型。但我想我明白了。我有单独的树和对象管理器实例。在这种情况下，Community.objects.create（）可能不支持树。