我可以在Django模型中使外键字段可选 [英] Can I make the foreign key field optional in Django model

问题描述

我有这个代码

subject      = models.ForeignKey(subjects)
location     = models.ForeignKey(location)
publisher    =  models.ForeignKey(publisher)

这里并不总是有可能书的三个价值。
有时如果我不知道主题或位置，或发行商。然后我想保持空白

There its not always possible that I have three values of books. so sometimes if I don't know subject or location, or publisher. Then I want to keep them empty

但是如果我有，那么我需要选择框来选择。可能这样

But if I have then I need select box to select. is it possible like that

推荐答案

当然，只需添加 blank = True，null = True 对于您想要保持可选的每个字段，如

Sure, just add blank=True, null=True for each field that you want to remain optional like

subject = models.ForeignKey(subjects, blank=True, null=True)

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