在mongodb中更新嵌套文档 [英] Updating nested documents in mongodb

问题描述

说我有一个像这样的数据结构:

Say I have a data structure something like this:

{
    'name': 'test',
    'anotherdoc': {
        'something': 'someval',
        'somenum': 1
    }
}

现在，说我想设置一些东西.最初，我虽然会这样做:

Now, say I wanted to set something. Initially, I though it would be done like so:

collection.update({'_id': myid}, {$set: {'anotherdoc.something': 'somenewval'});

但是，这似乎是不正确的.它确实在其中放置了一些数据，但是这样做的方式很奇怪.在这种情况下，它最终将像这样:

This, however, seems to be incorrect. It does put some data in there, but it does so in an odd manner. It would, in this case, end up like so:

[
    {
        'name': 'test',
        'anotherdoc': {
            'something': 'someval',
            'somenum': 1
        }
    },
    ['anotherdoc.something', 'someval']
]

当然，不是我想要的.

推荐答案

以下内容在mongo shell中对我有效-因此，我不确定上面发生的事情对您有何影响.试试看，看看是否有效?如果是这样，我想说一下，以防万一以前有问题，请获取最新的mongo代码.

The following works for me from the mongo shell - so I'm not sure what happened above for you. Try this and see if it works? If so I would say grab the latest mongo code in case something used to be problematic.

x = { 'name': 'test', anotherdoc: { 'something': 'someval', somenum : 1 } }
> x
{"name" : "test" , "anotherdoc" : {"something" : "someval" , "somenum" : 1}}
> collection = db.foo;
test.foo
> collection.insert(x)
> collection.find()
{"_id" :  ObjectId( "4a61b6711591f41f0f1bc5ff")  , "name" : "test" , "anotherdoc" : {"something" : "someval" , "somenum" : 1}}
> x
{"name" : "test" , "anotherdoc" : {"something" : "someval" , "somenum" : 1}}
> x._id
> x = collection.findOne()
{"_id" :  ObjectId( "4a61b6711591f41f0f1bc5ff")  , "name" : "test" , "anotherdoc" : {"something" : "someval" , "somenum" : 1}}
> collection.update({'_id': x._id}, {$set: {'anotherdoc.something': 'somenewval'}} )
> collection.find()
{"_id" :  ObjectId( "4a61b6711591f41f0f1bc5ff")  , "name" : "test" , "anotherdoc" : {"somenum" : 1 , "something" : "somenewval"}}
> 

如上所述，MongoDB论坛的访问速度可能更快(或尝试使用IRC).

As mentioned above, the MongoDB forums probably get seen faster (or try IRC).

这篇关于在mongodb中更新嵌套文档的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！