node.js Mongoose 唯一验证错误类型
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Mongoose unique validation error type
提问by Olivier
I'm using this schema with mongoose 3.0.3from npm:
我正在使用mongoose 3.0.3来自 npm 的这个架构：
var schema = new Schema({
_id: Schema.ObjectId,
email: {type: String, required: true, unique: true}
});
If I try to save a email that is already in db, I expect to get a ValidationErrorlike if a requiredfield is omitted. However this is not the case, I get a MongoError: E11000 duplicate key error index.
如果我尝试保存已经在 db 中的电子邮件，我希望在省略ValidationError某个required字段时得到类似的结果。然而事实并非如此，我得到了一个MongoError: E11000 duplicate key error index.
Which is not a validation error (happens even if I remove the unique:true).
这不是验证错误（即使我删除了 unique:true 也会发生）。
Any idea why?
知道为什么吗？
回答by Mushex Antaranian
I prefer putting it in path validation mechanisms, like
我更喜欢把它放在路径验证机制中，比如
UserSchema.path('email').validate(function(value, done) {
this.model('User').count({ email: value }, function(err, count) {
if (err) {
return done(err);
}
// If `count` is greater than zero, "invalidate"
done(!count);
});
}, 'Email already exists');
Then it'll just get wrapped into ValidationErrorand will return as first argument when you call validateor save.
然后它会被包裹ValidationError并在您调用validateor时作为第一个参数返回save。
回答by Alex
This is expected behavior
这是预期的行为
The unique: trueis equivalent to setting an index in mongodb like this:
该unique: true等同于这样的mongodb设置索引：
db.myCollection.ensureIndex( { "email": 1 }, { unique: true } )
To do this type of validation using Mongoose (Mongoose calls this complex validation- ie- you are not just asserting the value is a number for example), you will need to wire in to the pre-save event:
要使用 Mongoose 进行这种类型的验证（Mongoose 将这种复杂的验证称为 - 即 - 例如，您不仅仅是断言该值是一个数字），您需要连接到预保存事件：
mySchema.pre("save",function(next, done) {
var self = this;
mongoose.models["User"].findOne({email : self.email},function(err, results) {
if(err) {
done(err);
} else if(results) { //there was a result found, so the email address exists
self.invalidate("email","email must be unique");
done(new Error("email must be unique"));
} else {
done();
}
});
next();
});
回答by Sritam
I had some issues with the approved answer. Namely:
我对批准的答案有一些问题。即：
this.model('User')didn't work for me.- the callback
donewasn't working properly.
this.model('User')对我不起作用。- 回调
done没有正常工作。
I resolved those issues by:
我通过以下方式解决了这些问题：
UserSchema.path('email').validate(async (value) => {
const emailCount = await mongoose.models.User.countDocuments({email: value });
return !emailCount;
}, 'Email already exists');
I use async/awaitwhich is a personal preference because it is much neater: https://javascript.info/async-await.
我使用async/await这是个人偏好，因为它更整洁：https: //javascript.info/async-await。
Let me know if I got something wrong.
如果我有什么问题，请告诉我。
