问题很可能是您的模型没有附加架构.

Very likely the problem is that your model does not have a schema attached.

const { Schema } = require('mongoose');
const StudentSchema = new Schema({
        firstName: {type: String, required: true},
        lastName: {type: String, required: true},
        age: {type: Number},
        facultyNumber: {type: String, unique: true}
    }};

let Student = mongoose.model('Student', StudentSchema);