多个字段对应一个外键时，会报错，如：
1 class Storehouse_list(models.Model):#库位列表 2 nid = models.AutoField(primary_key=True) 3 title = models.CharField(max_length=32)#仓库名称 4 5 class Storehouse_change(models.Model):#调库单 6 nid = models.AutoField(primary_key=True) 7 matter = models.ForeignKey(to='Matter_list',to_field='nid',on_delete=models.CASCADE)#物料名称 8 number = models.IntegerField#数量 9 storehouse_in = models.ForeignKey(verbose_name='出仓仓库',to='Storehouse_list',to_field='nid',on_delete=models.CASCADE)#物料所调入的仓库 10 storehouse_out = models.ForeignKey(verbose_name='入仓仓库',to='Storehouse_list',to_field='nid',on_delete=models.CASCADE)#物料调出的仓库 11 create_date = models.DateTimeField(verbose_name="创建时间", auto_now_add=True) 12 create_user = models.ForeignKey(to="UserInfo",to_field="nid",on_delete=models.CASCADE)#操作员
同时外键关联库位列表，会报错。
解决办法：给models.ForeignKey()加入related_name参数，定义不同的关联名称，如修改上面代码中的storehouse_in和storehouse_out即可解决问题：
1 storehouse_in = models.ForeignKey(verbose_name='出仓仓库',to='Storehouse_list',to_field='nid',related_name="出仓仓库",on_delete=models.CASCADE)#物料所调入的仓库 2 storehouse_out = models.ForeignKey(verbose_name='入仓仓库',to='Storehouse_list',to_field='nid',related_name="入仓仓库",on_delete=models.CASCADE)#物料调出的仓库