Djiango on_delete 解决TypeError: __init__() missing 1 required positional argument: 'on_delete'
解决TypeError: __init__() missing 1 required positional argument: 'on_delete'
试用Djiango的时候发现执行mange.py makemigrations 和 migrate是会报错,少位置参数on_delete,查了一下是因为指定外键的方式不对,改一下就OK了。
代码如下:
fromdjango.dbimportmodels# Create your models here.classBookInfo(models.Model):"""model of book infomation"""# 书的标题 字符串类型 最大长度20btitle = models.CharField(max_length=20)# 出版日期 日期类型bpub_date = models.DateTimeField()classHeroInfo(models.Model):"""model of hero information"""# 英雄的名字 字符串类型 最大长度30hname = models.CharField(max_length=30)# 性别 布尔类型hgender = models.BooleanField()# 内容 字符串类型 最大长度1000hcontent = models.CharField(max_length=1000)# 英雄出现的书 一对多设计 多方持有一方的外键hbook = models.ForeignKey(BookInfo)
解决方法:
# 英雄出现的书 一对多设计 多方持有一方的外键# hbook = models.ForeignKey(BookInfo)hbook= models.ForeignKey('BookInfo', on_delete=models.CASCADE)
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