Mongoose查找查询未执行
我试图从mongodb中获取一些数据。我能够从模型MyModel（在Server.js中定义）中获取详细信息。但是我无法在模型Skill（在Skill.js中定义）中执行find方法。
Server.js
let express = require('express');
let app = express();
var config = require('./config/config');
let bodyParser = require('body-parser');
var mongoose = require('mongoose');
var cors = require('cors')
var path = require("path");
let Skill = require('./app/models/Skill');
const dbURI = config.dbURI;
app.use(cors());
app.use(bodyParser.json(true));
mongoose.connect(dbURI, {useNewUrlParser: true});
mongoose.connection.on('connected', function () {
console.log("Connected");
});
var MyModel = mongoose.model('Test', new Schema({ name: String
}));
Skill.findOne(function(error, result) {
console.log("1",error,result);
});
MyModel.findOne(function(error, result) {
console.log("2",error,result);
});
app.listen(config.appPort,function () {
console.log('App running on port :: "' + config.appPort.toString() + '"');
});
app/models/Skill.js
var mongoose = require('mongoose');
var skillSchema = new mongoose.Schema({
name: String,
length: String,
});
var Skill = mongoose.model('Skill', skillSchema,'Skill');
module.exports = Skill;
Output
App running on port :: "8080"
Conneccted
2 null { _id: 5c6678215c50a65e59fc6a89, name: 'test', __v: 0 }
我在创建架构时没有发现任何问题。有人可以帮我解决这个问题吗？
回答如下：我目前无法测试我的建议，但我在您的代码中注意到的一件事是您查询，如
Skill.findOne(function(error, result) {
console.log("1",error,result);
});
MyModel.findOne(function(error, result) {
console.log("2",error,result);
});
不会在“连接”回调中执行;可能这不是主要问题，但我会尝试更改代码如下：
mongoose.connection.on('connected', function () {
console.log("Connected");
Skill.findOne(function(error, result) {
console.log("1",error,result);
});
MyModel.findOne(function(error, result) {
console.log("2",error,result);
});
});
关键是每次调用（.on，.findOne）都会启动一个promise，它封装了一个异步行为。我在,findOne调用之后放置.on调用，当你启动.findOne时你无法确定Mongoose的连接是否准备就绪...
Mongoose查找查询未执行
我试图从mongodb中获取一些数据。我能够从模型MyModel（在Server.js中定义）中获取详细信息。但是我无法在模型Skill（在Skill.js中定义）中执行find方法。
Server.js
let express = require('express');
let app = express();
var config = require('./config/config');
let bodyParser = require('body-parser');
var mongoose = require('mongoose');
var cors = require('cors')
var path = require("path");
let Skill = require('./app/models/Skill');
const dbURI = config.dbURI;
app.use(cors());
app.use(bodyParser.json(true));
mongoose.connect(dbURI, {useNewUrlParser: true});
mongoose.connection.on('connected', function () {
console.log("Connected");
});
var MyModel = mongoose.model('Test', new Schema({ name: String
}));
Skill.findOne(function(error, result) {
console.log("1",error,result);
});
MyModel.findOne(function(error, result) {
console.log("2",error,result);
});
app.listen(config.appPort,function () {
console.log('App running on port :: "' + config.appPort.toString() + '"');
});
app/models/Skill.js
var mongoose = require('mongoose');
var skillSchema = new mongoose.Schema({
name: String,
length: String,
});
var Skill = mongoose.model('Skill', skillSchema,'Skill');
module.exports = Skill;
Output
App running on port :: "8080"
Conneccted
2 null { _id: 5c6678215c50a65e59fc6a89, name: 'test', __v: 0 }
我在创建架构时没有发现任何问题。有人可以帮我解决这个问题吗？
回答如下：我目前无法测试我的建议，但我在您的代码中注意到的一件事是您查询，如
Skill.findOne(function(error, result) {
console.log("1",error,result);
});
MyModel.findOne(function(error, result) {
console.log("2",error,result);
});
不会在“连接”回调中执行;可能这不是主要问题，但我会尝试更改代码如下：
mongoose.connection.on('connected', function () {
console.log("Connected");
Skill.findOne(function(error, result) {
console.log("1",error,result);
});
MyModel.findOne(function(error, result) {
console.log("2",error,result);
});
});
关键是每次调用（.on，.findOne）都会启动一个promise，它封装了一个异步行为。我在,findOne调用之后放置.on调用，当你启动.findOne时你无法确定Mongoose的连接是否准备就绪...