model.ForeignKey() TypeError: __init__() missing 1 required positional argument: 'on_delete'
course = models.ForeignKey(Course,verbose_name=u'課程') TypeError: init() missing 1 require positional argument: ‘on_delete’ 今天寫了一個這樣的報錯，就是當我指定外鍵後，生成遷移的時候報錯，說我這個ForeignKey方法缺乏了一個參數on_delete,查了資料後才知道，原來當
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