MongoDB schema design for multiple user types
You could try using .discriminator({...}) function to build the User schema so the other schemas can directly "inherit" the attributes.
const options = {discriminatorKey: 'kind'};const UserSchema = new Schema({ name: String, email: String, password: String, /* role: String, Student or Teacher <-- NO NEED FOR THIS. */ profile: { type: ObjectID, refPath: 'role' }}, options);const Student = User.discriminator('Student', new Schema({ age: Number, grade: Number, teachers: [{ type: ObjectID, ref: 'Teacher' }]}, options));const Teacher = User.discriminator('Teacher', new Schema({ school: String, subject: String}, options));const student = new Student({ name: "John Appleseed", email: "john@gmail.com", password: "123", age: 18, grade: 12, teachers: [...]});console.log(student.kind) // StudentCheck the docs.