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javascript - Mongoose，Node.js 正在返回一个空数组

问题描述

我正在用 node.js 编写代码。对此很新，问题是猫鼬返回一个空数组。这段代码中一定有错误，但我找不到。有任何想法吗？

礼服模式

var dressesSchema = mongoose.Schema({
    title:{
    type: String,
    required: true
},
description:{
    type: String,
    required: true
}
});

var Dress = module.exports = mongoose.model('Dress', dressesSchema);

从数据库中获取礼服

module.exports.getDresses = function(callback, limit){
    Dress.find(callback).limit(limit);
};

Dress = require('./models/dress');

app.get('/api/dresses', function(req, res){
    Dress.getDresses(function(err, dresses){
        if(err){
            throw err;
        }
        res.json(dresses);
    });
});

标签： javascriptnode.jsmongodbexpressmongoose

解决方案

示例如何通过 mongoose 使用 find ：

// named john and at least 18
MyModel.find({ name: 'john', age: { $gte: 18 }});

// executes immediately, passing results to callback
MyModel.find({ name: 'john', age: { $gte: 18 }}, function (err, docs) {});

// name LIKE john and only selecting the "name" and "friends" fields, executing immediately
MyModel.find({ name: /john/i }, 'name friends', function (err, docs) { })

// passing options
MyModel.find({ name: /john/i }, null, { skip: 10 })

// passing options and executing immediately
MyModel.find({ name: /john/i }, null, { skip: 10 }, function (err, docs) {});

// executing a query explicitly
var query = MyModel.find({ name: /john/i }, null, { skip: 10 })
query.exec(function (err, docs) {});

// using the promise returned from executing a query
var query = MyModel.find({ name: /john/i }, null, { skip: 10 });
var promise = query.exec();
promise.addBack(function (err, docs) {});

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