猫鼬:不允许更新特定字段 [英] mongoose: disallow updating of specific fields

问题描述

var post = mongoose.Schema({
    ...
    _createdOn: Date
});

我只允许在创建文档时设置_createdOn字段，而不允许在以后的更新中对其进行更改.猫鼬是怎么做的?

I want to allow setting the _createdOn field only upon document creation, and disallow changing it on future updates. How is it done in Mongoose?

推荐答案

我通过在架构的预保存钩子中设置_createdOn(仅在第一次保存时)实现了这种效果:

I achieved this effect by setting the _createdOn in the schema's pre-save hook (only upon first save):

schema.pre('save', function (next) {
    if (!this._createdOn) {
        this._createdOn = new Date();
    }
    next();
});

...并禁止在任何其他地方进行更改:

... and disallowing changes from anywhere else:

userSchema.pre('validate', function (next) {
    if (this.isModified('_createdOn')) {
        this.invalidate('_createdOn');
    }
    next();
});

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