完美解决Django2.0中models下的ForeignKey()问题

Django2.0中编写models类下的ForeignKey book = models.ForeignKey(‘BookInfo’) django2.0与之前的1.8不同, 错误: book = models.ForeignKey(‘BookInfo’) TypeError: __init__() missing 1 required positional argument: ‘on_delete’ 解决方法: book = models.ForeignKey(‘BookInfo’, on_delete=models.CASCADE,) 加上on_delete参数就可以了!