为什么“查找”查询在MongoDB中返回查询对象?

时间:2019-09-03 17:55:09

标签: javascript node.js mongodb mongoose

我已经在SO上查看了许多答案,但是没有一个能解决我的问题。

我目前正在使用node,express和mongodb创建一个项目。我从种子文件开始,将一些数据放入mongodb:

var products = [
    new ProductModel(data),
    new ProductModel(data),
    new ProductModel(data),
    new ProductModel(data),
];

// Connecting to mongodb using mongoose.
mongoose.connect(config.mongodb.dsn, { useNewUrlParser: true })
    .then(() => {
        console.log("Successfully connected to MongoDB through Mongoose.");
    })
    .catch((error) => {
        console.log("Error when connecting to MongoDB through Mongoose: " + error);
    });

// Saving product instances to the product document in mongodb
var done = 0;
for (var i = 0; i < products.length; i++) {
    products[i].save((error, result) => {
        done++;
        if (done == products.length) {
            // Disconnecting...
            console.log("All products have been loaded into mongodb. Disconnecting now...");
            mongoose.disconnect();
        }
    });
}

然后,我尝试使用以下方法在我的路线文件中检索此数据:

router.get('/', function(req, res, next) {
    const products = ProductModel.find();
    console.log(products);
    res.render('shop/index', { products });
});

但是,我正在console.loging结果在我的终端上,唯一出现的结果是一个查询对象,如下所示:

Query {
  _mongooseOptions: {},
  _transforms: [],
  _hooks: Kareem { _pres: Map {}, _posts: Map {} },
  _executionCount: 0,
  mongooseCollection:
   NativeCollection { 
(...)
_traceFunction: undefined,
  '$useProjection': true }

我需要在数据库中检索产品。我在做什么错了?

1 个答案:

答案 0 :(得分:3)

一切都会执行。 find()根据文档返回Query对象:https://mongoosejs.com/docs/api.html#model_Model.find

如果您希望它返回值,只需将其转为等待状态,然后调用exec即可获得承诺:

router.get('/', async function(req, res, next) {
    const products = await ProductModel.find().exec();
    console.log(products);
    res.render('shop/index', { products });
});