解决Django: [TypeError: __init__() missing 1 required positional argument: 'on_delete']
试用python3.7 + Django2.1.3的时候, 在建立模型类关联外键时, 报以下错误: Traceback (most recent call last):
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TypeError: __init__() missing 1 required positional argument: 'on_delete' 解决办法: # 关联外键时设置`on_delete
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