CakePHP - 允许belongsTo外键为空值
我的数据库中有一个名为通知的表和一个名为注释的表。通知在笔记上有一个外键引用，我希望 CakePHP 认识到该值可以为 null，我是否需要在模型中进行任何设置才能使其生效？或者只需要对数据库进行约束？
I have a table called notifications in my DB and a table called notes. Notifications has a foreign key reference on notes, I want CakePHP to recognize that this value can be null, do I need to set anything up in my model for this to take effect? Or only the constraint on the DB is required?
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我经常这样做。您将遇到的唯一问题是 Cake 将空值存储为空字符串，这对外键不利。我写了一个简单、愚蠢的
NullableBehavior来解决这个问题。I do this fairly frequently. The only problem that you'll run into is that Cake stores empty values as empty strings which is bad for foreign keys. I wrote a simple, stupid
NullableBehaviorto fix that.