django数据库迁移报错 TypeError:__init__() missing 1 required positional argument :'on_delete'

django2.0 在定义user字段的时候,关联外键,如果这样写的话，迁移数据库，会提示缺少 on_delete 参数

class OAuthQQUser(BaseModel):
    """QQ登录数据"""
    user = models.ForeignKey('user.User', verbose_name='用户')
    openid = models.CharField(max_length=64, verbose_name='openid', db_index=True)

    class Meta:
        db_table = 'tb_oauth_qq'
        verbose_name = 'QQ登录用户数据'
        verbose_name_plural = verbose_name

在这里插入图片描述
改成这样写,然后执行迁移命令，搞定

class OAuthQQUser(BaseModel):
    """QQ登录数据"""
    user = models.ForeignKey('user.User', on_delete=models.CASCADE, verbose_name='用户')
    openid = models.CharField(max_length=64, verbose_name='openid', db_index=True)

    class Meta:
        db_table = 'tb_oauth_qq'
        verbose_name = 'QQ登录用户数据'
        verbose_name_plural = verbose_name

TypeError:init() missing 1 required positional argument :‘on_delete’

django数据库迁移报错 TypeError:init() missing 1 required positional argument :'on_delete'

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