node.js - 查找具有同时匹配两个（或更多）属性的子文档的文档

Question

在 Node with Mongoose 中，我想在集合中找到一个对象Content。它有一个名为的子文档列表，其中users包含属性stream和。我这样做是为了在该字段中获取具有特定用户属性的所有文档。useradded_idusers.user

Content.find( { 'users.user': user._id } ).sort( { 'users.added': -1 } )

这似乎有效（尽管我不确定是否.sort真的在这里工作。但是，我想匹配两个字段，如下所示：

Content.find( { 'users.user': user._id, 'users.stream': stream } } ).sort( { 'users.added': -1 } )

这似乎不起作用。这样做的正确方法是什么？

---

这是一个示例文档

{
    "_id" : ObjectId("551c6b37859e51fb9e9fde83"),
    "url" : "https://www.youtube.com/watch?v=f9v_XN7Wxh8",
    "title" : "Playing Games in 360°",
    "date" : "2015-03-10T00:19:53.000Z",
    "author" : "Econael",
    "description" : "Blinky is a proof of concept of enhanced peripheral vision in video games, showcasing different kinds of lens projections in Quake (a mod of Fisheye Quake, using the TyrQuake engine).\n\nDemo and additional info here:\nhttps://github.com/shaunlebron/blinky\n\nThanks to @shaunlebron for making this very interesting proof of concept!\n\nSubscribe: http://www.youtube.com/subscription_center?add_user=econaelgaming\nTwitter: https://twitter.com/EconaelGaming",
    "duration" : 442,
    "likes" : 516,
    "dislikes" : 13,
    "views" : 65568,
    "users" : [ 
        {
            "user" : "54f6688c55407c0300b883f2",
            "added" : 1427925815190,
            "_id" : ObjectId("551c6b37859e51fb9e9fde84"),
            "tags" : []
        }
    ],
    "images" : [ 
        {
            "hash" : "1ab544648d7dff6e15826cda7a170ddb",
            "thumb" : "...",
            "orig" : "..."
        }
    ],
    "tags" : [],
    "__v" : 0
}

Answer 1

使用 $elemMatch 运算符来指定嵌入文档数组的多个条件：

Content.find({"users": {$elemMatch: {"user": user.id, "stream": stream}}});