node.js Mongoose，查找，返回特定属性
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Mongoose, find, return specific properties
提问by Joe
I have this get call:
我有这个电话：
exports.getBIMFromProject = function(req, res){
mongoose.model('bim').find({projectId: req.params['prj_id']}, function(err, bim){
if(err){
console.error(err);
res.send(500)
}
res.send(200, bim);
});
};
Where do I specify which properties I want to return? Can't find it in the docs. The above returns the entire object. I only want a few properties returned.
我在哪里指定要返回的属性？在文档中找不到它。以上返回整个对象。我只想要返回一些属性。
This is my schema:
这是我的架构：
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var bimSchema = new Schema({
projectId: Number,
user: String,
items:[
{
bimObjectId: Number,
typeId: String,
position:{
floor: String,
room:{
name: String,
number: String
}
}
}
]
});
mongoose.model('bim', bimSchema);
I don't want the items array included in my rest call.
我不希望在我的休息调用中包含 items 数组。
回答by wdberkeley
You use projection. The first example in the mongoose query docshas a projection operation tucked in.
你使用投影。mongoose 查询文档中的第一个示例包含一个投影操作。
NB: not real code b/c I highlighted the important bits with triple stars
注意：不是真正的代码 b/c 我用三颗星突出了重要的部分
// find each person with a last name matching 'Ghost', ***selecting the `name` and `occupation` fields***
Person.findOne({ 'name.last': 'Ghost' }, ***'name occupation'***, function (err, person) {
if (err) return handleError(err);
console.log('%s %s is a %s.', person.name.first, person.name.last, person.occupation) // Space Ghost is a talk show host.
})
The Personschema isn't specified but I think the example is clear enough.
该Person方案没有规定，但我认为例子是再清楚不过。
回答by martinho
MyModel.find({name: "john" }, 'name age address', function(err, docs) { })
This will return fields name, age and address only.
这将仅返回字段名称、年龄和地址。
回答by monkeyinsight
You need to define your model schemas http://mongoosejs.com/docs/guide.html
