我开始使用 ' order_insertion_by
' 来更改 django-mptt 中的默认排序。
到目前为止,我还没有在本地发现问题,但我的测试失败了。
背景: 我有测试夹具,它在树结构和两棵树中创建了大约 10 个对象。
我order_insertion_by
在模型中添加了“”。当我运行测试时,它失败了,因为树结构现在一团糟。
但是,如果我在重新加载测试装置后进行树重建,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.
并在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']
这引发了几个问题:
我认为' order_insertion_by '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/更新后重新构建,以确保树处于良好状态。是这样吗?
在我的测试用例中,为什么初始树一团糟?我只创建了大约 10 个具有树结构的对象。