我试图找到一种方法,来检查如果一个学生签署了一课程/s使用猫鼬。
我有这些架构:
课程架构:
const mongoose = require("mongoose");
const User = require("../models/User");
const CourseSchema = new mongoose.Schema(
{
courseName: { type: String, required: true, unique: true },
teacher: {
teacherName: { type: String },
teacherID: {
type: mongoose.Schema.Types.ObjectId,
ref: "User",
},
},
students: [
{
studentName: { type: String },
studentID: {
type: mongoose.Schema.Types.ObjectId,
ref: "User",
},
},
],
},
{ collection: "courses" },
{ timestamps: true }
);
module.exports = mongoose.model("Course", CourseSchema);
在这里我挽救的所有学生签署的课程内 学生学 阵列的对象。
学生模式:
const mongoose = require("mongoose");
const UserSchema = new mongoose.Schema(
{
username: { type: String, required: true, unique: true },
email: { type: String, required: true, unique: true },
password: { type: String, required: true },
userType: {
type: String,
enum: ["student", "teacher"],
default: "student",
},
isOnline: { type: Boolean, default: false },
},
{ collection: "users" },
{ timestamps: true }
);
module.exports = mongoose.model("User", UserSchema);
现在我想做一个的查询将返回的一个列表中的课程的学生签署。
例如:
如果我有3个课程=[数学、英语、程序] 和学生有id=1人签署的(在学阵列)用于数学和英语,则查询将返回的数学和英语的课程。
我已经试过这个没有成功(得到null,但用户是在学阵列的对象):
router.post("/:id", async (req, res) => {
try {
// get user
var user = await User.findOne({
username: req.body.username,
email: req.body.email,
password: req.body.password,
});
// search user courses by user id.
const coursesList = await Course.find({
students: {
$in: [{ studentID: user._id, studentName: user.username }],
},
});
res.status(200).json(coursesList);
} catch (err) {
res.status(500).json(err.message);
}
});