Django-mptt: .move_to not working in test runner

The .move_to () method does not work for me. I looked at other posts that people recommend keeping the instance as well as reloading the node instances. But none of these solutions work in this case. I also tried to do ._tree_manager.rebuild (), which also does not work. My test code is below:

def test_reorder_pages(self):
    p = Page.objects.get(slug='page-1')
    p2 = Page.objects.get(slug='page-2')

    self.assertEqual(1, p.lft)
    self.assertEqual(3, p2.lft)

    p2.move_to(p, 'left')

    p = Page.objects.get(slug='page-1')
    p2 = Page.objects.get(slug='page-2')

    ## Values should now be reversed
    self.assertEqual(3, p.lft)
    self.assertEqual(1, p2.lft)

Basically, I expect page-2 to fit "to" (to the left of ...) page-1. But the last two statements fail. I also checked all the other values ​​(lft, rght, level, tree_id), and none of them changed.

Does anyone know what I'm doing wrong?

EDIT: mossplix page.tree.rebuild(). , . move_to() :

    self.assertEqual(0, p.level)
    self.assertEqual(1, p.lft)
    self.assertEqual(2, p.rght)
    self.assertEqual(1, p.tree_id)

    self.assertEqual(0, p2.level)
    self.assertEqual(3, p2.lft)
    self.assertEqual(4, p2.rght)
    self.assertEqual(1, p.tree_id)

move_to() rebuild(), , :

    self.assertEqual(0, np.level)
    self.assertEqual(3, np.lft)
    self.assertEqual(4, np.rght)
    self.assertEqual(1, p.tree_id)

    self.assertEqual(0, np2.level)
    self.assertEqual(1, np2.lft)
    self.assertEqual(2, np2.rght)
    self.assertEqual(1, p.tree_id)

, (lft, rght, level, tree_id). , , ?

: , - . , , , . TransactionTestCase, . , , .