流星找到一个带有 id 的对象 [英] Meteor finding an object with id

问题描述

假设我有一个类似于 557fba5a8032a674d929e6a1 的 id 字符串，它存储在会话中.我尝试检索 _id 与上述相同的文档，但即使它存在也找不到它.

Assume I have an id string that looks like 557fba5a8032a674d929e6a1 which is stored in session. I try to retrieve a document whose _id is same as above, but I fail to find it even though it exists.

Posts.findOne({_id: "557fba5a8032a674d929e6a1"});

返回未定义.现有对象如下所示:

returns undefined. The existing object looks like following:

我可以做到这一点

var id = "557fba5a8032a674d929e6a1";
var posts = Posts.find().fetch();
var post = _.filter(posts, function (post) { return post._id._str === id });
return post

但它看起来很脏.这是我的控制台输入和输出，用于进一步调查此行为(Posts == Applicant).你会发现，虽然我们要找的文件肯定存在，但我找不到.

but it seems dirty. Here's my console inputs and outputs to further investigate this behavior (Posts == Applicants). You will notice that even though the document that we are looking for definitely exists, I can't find it.

推荐答案

您必须将 _id 定义为 Mongo.ObjectID 来表示 ObjectID 输入正确.

You have to define _id as a Mongo.ObjectID to represent the ObjectID type correctly.

Posts.findOne({_id: new Mongo.ObjectID("557fba5a8032a674d929e6a1") });

使用 Meteor 的 ObjectID 的一个警告是它们的时间戳不正确.特别是当它们插入客户端时.

One caveat of ObjectIDs with Meteor is their timestamps aren't correct. Particularly if they're inserted on the client.

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