具体参见：http://marconijr.com/content/how-stop-recursion-djangos-postsave-signal
post_save 中直接 instance.save() 的时候就会到死循环去，所以得先 disconnect 再 connect
例子：
def bill_roll_work_flow_set_registered(sender, instance, created, **kwargs):
if instance.state == 'registered':
instance.register_at = datetime.now()
post_save.disconnect(bill_roll_work_flow_set_registered, sender=BillRollWorkFlow, dispatch_uid="bill_roll_work_flow_set_registered")
instance.save()
post_save.connect(bill_roll_work_flow_set_registered, sender=BillRollWorkFlow, dispatch_uid="bill_roll_work_flow_set_registered")
post_save.connect(bill_roll_work_flow_set_registered, sender=BillRollWorkFlow, dispatch_uid="bill_roll_work_flow_set_registered")
post_save 中直接 instance.save() 的时候就会到死循环去，所以得先 disconnect 再 connect
例子：
def bill_roll_work_flow_set_registered(sender, instance, created, **kwargs):
if instance.state == 'registered':
instance.register_at = datetime.now()
post_save.disconnect(bill_roll_work_flow_set_registered, sender=BillRollWorkFlow, dispatch_uid="bill_roll_work_flow_set_registered")
instance.save()
post_save.connect(bill_roll_work_flow_set_registered, sender=BillRollWorkFlow, dispatch_uid="bill_roll_work_flow_set_registered")
post_save.connect(bill_roll_work_flow_set_registered, sender=BillRollWorkFlow, dispatch_uid="bill_roll_work_flow_set_registered")
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