如何使用包含词典的数组?我正在尝试将所有post
字段聚集在一起,以便我可以搜索他们的文本。
我尝试使用mongo
shell无处可去。
User.Blog().find({}).where('post').in(writing).exec(function (err, result) {
//do something with results
}); // doesn't work
架构(编辑:从@JAM评论修复)
var blogSchema = new mongoose.Schema({
group: String,
writing: [{
post: String,
name : Number
}]
});
var Blog = mongoose.model('Blog', blogSchema);
更新:添加json数据和使用mongo shell将数据放入mongodb的命令:
{
group: "Design Writing",
writing: [{
post: "A very very very short post.",
name: 10
}, {
post: "An early morning post about everything.",
name: 11
}]
}
* 或者,这里作为一行插入名为my_collection
的集合中的数据库:*
db.my_collection.insert( {group: "Design Writing", writing: [{post: "A very very very short post.",name: 10}, {post: "An early morning post about everything.",name: 11}]} )
答案 0 :(得分:5)
writing
数组中的对象被视为sub/embedded-documents。这意味着当它们存储在数据库中时会为它们分配_id
。
因此,有几种方法可以根据这些子文档查询Blog
:
var ObjectId = mongoose.Types.ObjectId;
// Assuming these objects are in the 'writing' array of a Blog
var postObject = { post: 'some text', name: 10 },
postObjectWithId = { _id: new ObjectId(), post: 'some text', name: 10 };
// Example #1 Works!
Blog.find({'writing.post': postObject.post})
.exec(function(err, res){ onBlogResult("Ex#1", err, res) });
// Example #2 Works!
Blog.find({})
.where('writing').in([postObjectWithId])
.exec(function(err, res){ onBlogResult("Ex#2", err, res) });
// Example #3 Works - its the same as example #2!
Blog.find({'writing': { $in: [ postObjectWithId ]}})
.exec(function(err, res){ onBlogResult("Ex#3", err, res) });
// Example #4 Fails because of missing _id on postObject!
Blog.find({'writing': { $in: [ postObject ]}})
.exec(function(err, res){ onBlogResult("Ex#4", err, res) });
如您所见,如果您拥有完整对象(包括find
),则只能使用包含in
元素的数组的_id
个对象。
您可以在此GIST上查看整个来源 - 自行测试:)
希望这会有所帮助:)