几天前,我发布了this question。由于我没有找到 有效的解决方案,我已经更改了我的应用程序的结构,这就是为什么 我要发布这个新问题。
有User
和Task
模型。 User
包含两个Tasks
的列表,分别是tasksAssigned
和tasksCompleted
:
user.model.js
const mongoose = require("mongoose");
const autopopulate = require("mongoose-autopopulate");
const UserSchema = mongoose.Schema({
username: String,
password: String,
firstName: String,
lastName: String,
friends: [
{ type: mongoose.Schema.ObjectId, ref: "User", autopopulate: true }
],
tasksAssigned: [
{ type: mongoose.Schema.ObjectId, ref: "Task", autopopulate: true }
],
tasksCompleted: [
{ type: mongoose.Schema.ObjectId, ref: "Task", autopopulate: true }
]
// TODO: When saving, use something like this: peter.subjects.push(math._id, computer._id)
});
UserSchema.plugin(autopopulate);
module.exports = mongoose.model("User", UserSchema);
task.model.js
const mongoose = require("mongoose");
const autopopulate = require("mongoose-autopopulate");
const TaskSchema = mongoose.Schema({
name: String,
type: String,
percentage: Number
});
TaskSchema.plugin(autopopulate);
module.exports = mongoose.model("Task", TaskSchema);
我需要找到{strong>未未分配给特定Tasks
的{{1}}列表。在前端应用程序中,我有 User
方法:
task.service.js
在后端,有 function getAllUserTasksNotAssignedToUser(userId) {
$http
.get("http://localhost:3333/tasks/notAssignedToUser/" + userId)
.then(function(response) {
return response.data;
});
}
,其中定义了此路由:
task.routes.js
...并且 app.get("/tasks/notAssignedToUser/:userId", tasks.findAllNotAssignedToUser);
中有一种相关方法:
task.controller.js
如您所见,我的想法是先找到一个特定的exports.findAllNotAssignedToUser = (req, res) => {
console.log("Back controller call");
User.findById(req.params.userId)
.then(user => {
Task.find({ _id: {$nin: user.tasksAssigned }}).then(tasks => {
res.send(tasks);
});
})
.catch(err => {
res.status(500).send({
message:
err.message ||
"Some error occurred while retrieving tasks not assigned to the user."
});
});
};
,然后再找到不在该用户的User
列表中的所有Tasks
。但是,出了点问题,在浏览器的控制台中,我得到了:
tasksAssigned
实现此目标的正确方法是什么?
答案 0 :(得分:1)
我创建了您的架构,并填充了一些虚假数据:
let task1 = new Task({
name: 'task1',
type: 'type1',
percentage: '10'
});
task1.save();
let task2 = new Task({
name: 'task2',
type: 'type2',
percentage: '20'
});
task2.save();
let task3 = new Task({
name: 'task3',
type: 'type3',
percentage: '30'
});
task3.save();
我在 tasksAssigned 字段中为该用户添加了两个任务(task1和task3):
let user1 = new User({
username: 'name teste',
password: '123456',
firstName: 'first name test',
lastName: 'last name test',
friends: [],
tasksAssigned: ['5b579e94454cb206f6ca338f','5b579e94454cb206f6ca3391'],
tasksCompleted: []});
user1.save();
并执行您的代码。之后,我只发现一个问题,当您调用Task.find时,您需要检查是否找到用户,如果不进行检查,则user.tasksAssigned行中将收到错误消息。 / p>
User.findById('5b579ee41ac34e0763324fe3')
.then(user => {
if(user) {
Task.find({_id: {$nin: user.tasksAssigned}}).then(tasks => {
console.log(tasks);
res.send(tasks);
});
}
})
.catch(err => {
console.log('error');
console.log(err);
res.status(500).send({
message:
err.message ||
"Some error occurred while retrieving tasks not assigned to the user."
});
});
这是Task then方法内的控制台日志:
这是浏览器中路线的结果:
在此链接中,您可以看到有关承诺的Mongoose文档:Mongoose Promises