*platform:* Django-1.5, python2.7
*code：*
class TestModel(models.Model):
a = models.SmallIntegerField()
b = models.SmallIntegerField()
TestModel.objects.filter(a__range=(F('b')-1, F('b')+1)
*result：*
django.db.models.fields in get_prep_value
TypeError: int() argument must be a string or a number, not 'ExpressionNode'
*Why：*
Does anyone saw this error before, is it Django's bug?
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