MongoDB：不能从BSON类型EOO转换为日期 [英] MongoDB: can't convert from BSON type EOO to Date

问题描述

我试图使用聚合框架（使用ruby），并像这样投影日期：

I' trying to use aggregation framework (with ruby) and project the date like this:

db['requests'].aggregate([
{"$project" => {
    _id: 0, 
    method: '$method', 
    user: '$user', 
    year: {'$year' => '$timestamp'}
}}])

$ b b

文件类似这样：

the document is like this one:

{
_id: ObjectId("5177d7d7df26358289da7dfd"),
timestamp: ISODate("2013-04-12T03:58:05+00:00"),
method: "POST",
status: "200",
inputsize: "874",
outputsize: "4981",
user: "131"
}

但我得到以下错误：

Mongo::OperationFailure: Database command 'aggregate' failed: (errmsg: 'exception: can't convert from BSON type EOO to Date'; code: '16006'; ok: '0.0').

这很奇怪，因为它运行正确，如果我运行这个完全相同的数据库导入mongorestore 。

This is strange because it works correctly if I run this on the exactly same db which is imported with mongorestore.

推荐答案

问题是我保存了一些没有时间戳字段的文档。

The problem was that I was saving some documents without the timestamp field.

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