解決Django: [TypeError: __init__() missing 1 required positional argument: 'on_delete']
試用python3.7 + Django2.1.3的時候, 在建立模型類關聯外鍵時, 報以下錯誤: Traceback (most recent call last):
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TypeError: __init__() missing 1 required positional argument: 'on_delete' 解決辦法: # 關聯外鍵時設置`on_delete
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