Schema Validation

const userSchema = new mongoose.Schema({
  name: {
    type: String,
    required: true,
    minlength: 3,
    maxlength: 50,
  },
  email: {
    type: String,
    required: true,
    lowercase: true,
    match: /^[^\s@]+@[^\s@]+\.[^\s@]+$/,
  },
  age: {
    type: Number,
    min: 13,
    max: 120,
  },
  role: {
    type: String,
    enum: ["user", "admin", "moderator"],
    default: "user",
  },
  profileUrl: {
    type: String,
    validate: {
      validator: (v) => v.startsWith("https://"),
      message: "URL-টি https:// দিয়ে শুরু হোক",
    },
  },
});

const orderSchema = new mongoose.Schema({
  quantity: {
    type: Number,
    validate: {
      validator: (value) => Number.isInteger(value) && value > 0,
      message: (props) => props.value + " একটি বৈধ quantity নয়",
    },
  },
  discountCode: {
    type: String,
    validate: {
      validator: async (value) => {
        // ডেটাবেসে code-টা আছে কিনা যাচাই
        const code = await Coupon.findOne({ code: value });
        return code !== null;
      },
      message: "Invalid discount code",
    },
  },
});

try {
  await User.create({ name: "ab", email: "not-an-email" });
} catch (err) {
  if (err.name === "ValidationError") {
    for (const field in err.errors) {
      console.log(field, "→", err.errors[field].message);
    }
  }
}