There seems to be something else ...
The following test passes which indicates that position is set as 0 right
after the bullet and the slide are related:
93 def test_backref_set(self):
94 self._setup(ordering_list('position'))
95
96 #session = create_session()
97 s1 = Slide('Slide #1')
98 #session.add(s1)
99 #session.flush()
100
101 self.assert_(not s1.bullets)
102 self.assert_(len(s1.bullets) == 0)
103
104 b0 = Bullet('s1/b0')
105 assert b0.position == None
106 #session.add(b0)
107 b0.slide = s1
108 assert b0.position == 0
109
110 #session.flush()
111
112 self.assert_(s1.bullets)
113 self.assert_(len(s1.bullets) == 1)
114 self.assert_(s1.bullets[0] == b0)
115 self.assert_(s1.bullets[0].position == 0)
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