在猫鼬验证期间，有没有办法引用当前模型的_id字段? [英] Is there a way to refer to the current model's _id field during validation in mongoose?

问题描述

我有一个模式.唯一的处方是唯一性验证.

I have a schema. And the only prescription, is a uniqueness validation.

User.path("email").validate(hasUnique("email"), "uniqueness");

hasUnique返回mongoose将用于验证值唯一性的函数.

hasUnique returns the function that will be used by mongoose to validate the uniqueness of the value.

function hasUnique(key) {
  return function(value, respond) {
    var query = {};
    query[key] = /A regex used to look up the email/;

    User.findOne(query, function(err, user) {
      respond(!user);
    }
  }
}

这在创建新文档时效果很好.但是，当我查询文档，更改属性然后调用save时，此验证将被调用并失败，因为它在集合中看到了自己的电子邮件，并认为这不是唯一的.

This works well when a new document is created. But when I query a document, mutate an attribute then call save, this validation gets called and fails because it sees its own email in the collection and thinks this isn't unique.

是否可以在hasUnique返回的验证函数中排除文档本身?我的想法是，我可以添加$ not谓词以在查询中排除当前文档的_id字段.

Is there a way I can exclude the document itself in the validation function returned from hasUnique? My thought is that I can add a $not predicate to exclude the current doc's _id field in the query.

推荐答案

在Mongoose验证功能中，this是要验证的文档.

In a Mongoose validation function, this is the document being validated.

所以您可以这样做:

function hasUnique(key) {
  return function(value, respond) {
    var query = { _id: { $ne: this._id }};
    query[key] = /A regex used to look up the email/;

    User.findOne(query, function(err, user) {
      respond(!user);
    }
  }
}

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