class HeroInfo(models.Model): # 英雄名 hname = models.CharField(max_length=20) # 性别 hgender = models.BooleanField(default=False) # 备注 hcomment = models.CharField(max_length=200) # 外键 hbook = models.ForeignKey(‘BookInfo‘) # 删除标记 isDelete = models.BooleanField(default=False)
创建迁移文件时报错：
报错环境 python=3.6，django=2.2，PyMySQL=0.9.3
TypeError: __init__() missing 1 required positional argument: ‘on_delete‘
原因：
django2.0之后定义外键时需指定‘on_delete‘参数值。
详见django官方文档：https://docs.djangoproject.com/en/2.0/ref/models/fields/#django.db.models.ForeignKey
PS：
django2.1以后不再支持mysql5.5，python manage.py migrate时会报错：
raise MigrationSchemaMissing("Unable to create the django_migrations table (%s)" % exc) django.db.migrations.exceptions.MigrationSchemaMissing: Unable to create the django_migrations table ((1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘(6) NOT NULL)‘ at line 1"))
使用mysql5.7即可。
TypeError: __init__() missing 1 required positional argument: 'on_delete'
原文：https://www.cnblogs.com/AngelLoveRZZZ/p/10858942.html