django 2.X 关联 外键时会报错：TypeError: __init__() missing 1 required positional argument: ‘on_delete’
#python3 manage.py makemigrations
报错：
解决办法：
contact = models.ForeignKey(Contact, on_delete=models.CASCADE)
加参数：
on_delete=models.CASCADE
django 2.X 关联 外键时会报错：TypeError: __init__() missing 1 required positional argument: ‘on_delete’
#python3 manage.py makemigrations
报错：
解决办法：
contact = models.ForeignKey(Contact, on_delete=models.CASCADE)
加参数：
on_delete=models.CASCADE
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