Welcome to the training!

const directorSchema = new mongoose.Schema({
    "_id": mongoose.Schema.Types.ObjectId,
    "name": {
        type: String,
        required: true
    },
    "imdb": {
        type: String,
        required: true,
        validation: /^nm\d+$/
    }
});

const genreSchema = new mongoose.Schema({
    "_id": mongoose.Schema.Types.ObjectId,
    "name": {
        type: String,
        required: true
    }
});

const movieSchema = new mongoose.Schema({
    "_id": mongoose.Schema.Types.ObjectId,
    "title": {
        type: String,
        required: true
    },
    "imdb": {
        type: String,
        required: true,
        validation: /^tt\d+$/
    },
    "year": {
        type: Number,
        default: 2018,
        min: 1920
    },
    "directors": [directorSchema],
    "genres": [genreSchema]
});

function ibanValidator(value) {
	if (value == undefined || value.length < 5) {
        this.throwError("This is not a valid IBAN!")
    }
    modulusResult = this.calculateModulus(value);
    if (modulusResult != 1) {
		return false;
    }
	return true;
}
 
function tcKimlikNoValidator(value) {
	if (value.match("^\\d{11}$")==null) {
       return false;
    }
    digits = new Array(11);
    for (i=0;i<digits.length;++i) {
        digits[i] = value.charCodeAt(i) - 48;
        if (digits[i] < 0 || digits[i] > 9) {
           return false;
        }
    }
    x = digits[0];
    y = digits[1];
    for (i = 1; i < 5; i++) {
        x += Number(digits[2 * i]);
    }
    for (i = 2; i <= 4; i++) {
        y += Number(digits[2 * i - 1]);
    }
    c1 = 7 * x - y;
    if (c1 % 10 != digits[9]) {
       return false;
    }
    c2 = 0;
    for (i = 0; i < 10; ++i) {
        c2 += digits[i];
    }
    if (c2 % 10 != digits[10]) {
       return false;
    }
    return true;
};

const deparmentSchema = new mongoose.Schema({
    "name": {
        type: String,
        required: false,
        enum: ["IT", "Sales", "Finance", "HR"]
    }
});

const employeeSchema = new mongoose.Schema({
    "_id": mongoose.Schema.Types.ObjectId,
    "fullname": {
        type: String,
        required: true,
        minLength: 5
    },
    "identityNo": {
        type: String,
        required: true,
        validate: [tcKimlikNoValidator, 
            "You must provide a valid identity no!"]
    },
    "photo": {
        type: String,
        required: false
        // maxLength: 128000
    },
    "salary": {
        type: Number,
        required: true,
        min: 2000,
        default: 2000
    },
    "iban": {
        type: String,
        required: true,
        validate: [ibanValidator, "You must provide a valid iban!"]
    },
    "department": departmentSchema
}

const Employee = 
    mongoose.model("employees",employeeSchema);

const swaggerUi = require('swagger-ui-express');
const swaggerDocument = require('./swagger');
app.use('/api-docs', swaggerUi.serve, swaggerUi.setup(swaggerDocument));