跨App模塊進行外鍵的關聯

跨App模塊進行外鍵的關聯：

格式應當爲：模塊名稱.Model名稱

# sysmanage.py 
class WorkOreder(model.Model):
    pass

# WorkFlow.py
class FlowList(model.Model):
    work_name = models.ForeignKey("sysmanage.WorkOrder", on_delete=models.CASCADE, verbose_name="流程類型",related_name="work")