进入这个router get函数,log语句打印到控制台,但是find语句好像没有执行。有什么明显的原因吗?
const express = require('express');
const router = express.Router();
const mongoose = require('mongoose');
const Product = require('../models/product');
module.exports = router;
const url = "mongodb://xxxx@ds027425.mlab.com:xxxx/xxxx";
mongoose.Promise = global.Promise;
mongoose.createConnection(url, function(err) {
if(err) {
console.log('Error!!!' + err);
} else {
console.log('Connected to Database!');
}
});
router.get('/product/specialvalue', function(req, res) {
console.log('Get specialvalue called xxxx');
Product.find({'special_value': true})
.sort({'price': 1})
.exec(function(err, products) {
if(err) {
console.error('Error retrieving special value products!');
res.json(err);
} else {
console.log("products = " + JSON.stringify(products));
res.json(products);
}
});
});
这是 Mongoose 模型:
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const ProductSchema = new Schema({
producttype: String,
name: String,
brand: String,
model: String,
price: Number,
list_price: Number,
description: String,
rating: Number,
模型的延续:(系统迫使我添加更多细节)
item_no: String,
special_value: Boolean,
warranty: String,
feature: [String],
image: [String],
模型的延续:
specification: {
lowes_exclusive : Boolean,
color : String,
high_efficiency : Boolean,
automatic_load_balancing : Boolean,
product_capacity : String,
large_items_cycle : Boolean,
模型的延续:
exclusive_cycle : String,
maximum_spin_speed : String,
water_levels : String,
number_of_rinse_cycles : String
}
});
模型的延续:
var Product = mongoose.model('Product', ProductSchema, 'product');
module.exports=Product;
最佳答案
您的问题在于如何连接数据库。 mongoose.createConnection()
返回一个到数据库的连接对象,但没有将其设置为 mongoose 的默认连接。 find 查询未执行的原因是 Mongoose 将所有数据库调用排队并等待有打开的连接后再处理它们,而不是在没有连接时抛出错误。使用 mongoose.connect()
将解决您的问题。您可以在这里阅读 http://mongoosejs.com/docs/api.html#index_Mongoose-connect
关于node.js - Mongoose:find 语句未执行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45383509/