标签: mongodb-update

匹配元素看起来像:

{
    "_id": {
        "$oid": "519ebd1cef1fce06f90e3157"
    },
    "from": "Tester2",
    "to": "Tester",
    "messages": [
        {
            "username": "Tester2",
            "message": "heeey",
            "read": false
        },
        {
            "username": "Tester",
            "message": "hi!",
            "read": false
        },
        {
            "username": "Tester2",
            "message": "test",
            "read": false
        }
    ],
}

现在我尝试将read属性设置为用户名不等于的子元素的当前日期Tester:

var messages = db.collection('messages');
messages.update(
{
    _id: new BSON.ObjectID("519ebd1cef1fce06f90e3157"),
    messages: {
        $elemMatch: { username: { $ne: "Tester" } }
    }
},
{ $set: { 'messages.$.read': new Date() } },
{ multi: true }, function(error, result) { …

我想在当前文档中添加一个新字段(将来会用$ push填充的数组)但是我收到了错误 update failed: MongoError: Cannot apply $push/$pushAll modifier to non-array

我正在研究Meteor.users集合.

代码运行是:

var user = Meteor.userId();
Meteor.users.update({_id:user}, {$set: {"newfield": ["some data"]}});

我收集了以下文件:

{
    "_id" : ObjectId("56cbf9cd75de3ee9057b23c7"),
    "title" : "Abc",
    "comments" : [
        {
            "_id" : "",
            "message" : "",
            "active" : 1,
            "status" : 1,
        },
        {
            "_id" : "",
            "message" : "",
            "active" : 0,
            "status" : 1,
        },
        {
            "_id" : "",
            "message" : "",
            "active" : 1,
            "status" : 1,

        }
    ],

}
{
    "_id" : ObjectId("553744ae75de3eb9128b4568"),
    "title" : "Jhon",
    "comments" : [
        {
            "_id" : "",
            "message" : "",
            "active" : 1,
            "status" : 1,
        }
    ] …

使用mongo shell需要添加到更新/删除查询中以返回受查询影响的行数.