مبدل های سفارشی در DynamoDB: ساخت مدل های داده قوی با سهولت

using Amazon.DynamoDBv2.DataModel;
using Amazon.DynamoDBv2.DocumentModel;

public enum PaymentMethod
{
    CreditCard,
    PayPal,
    Bitcoin
}

public class PaymentMethodConverter : IPropertyConverter
{
    public DynamoDBEntry ToEntry(object value)
    {
        return new Primitive((value as PaymentMethod).ToString());
    }

    public object FromEntry(DynamoDBEntry entry)
    {
        return Enum.Parse(typeof(PaymentMethod), entry.AsString());
    }
}

[DynamoDBTable("Orders")]
public class Order
{
    [DynamoDBProperty("paymentMethod"), DynamoDBTypeConverter(typeof(PaymentMethodConverter))]
    public PaymentMethod PaymentMethod { get; set; }

    // ... other properties and methods
}

using Amazon.DynamoDBv2.DataModel;
using Newtonsoft.Json;

public class Address
{
    public string Street { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string ZipCode { get; set; }
}

public class AddressConverter : IPropertyConverter
{
    public DynamoDBEntry ToEntry(object value)
    {
        return new Primitive(JsonConvert.SerializeObject(value));
    }

    public object FromEntry(DynamoDBEntry entry)
    {
        return JsonConvert.DeserializeObject(entry.AsString(), typeof(Address));
    }
}

[DynamoDBTable("Customers")]
public class Customer
{
    [DynamoDBProperty("address"), DynamoDBTypeConverter(typeof(AddressConverter))]
    public Address Address { get; set; }

    // ... other properties and methods
}

using Amazon.DynamoDBv2.DataModel;
using Newtonsoft.Json;
using System.Collections.Generic;

public class Address
{
    public string Street { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string ZipCode { get; set; }
}

public class Customer
{
    public string CustomerId { get; set; }
    public Address Address { get; set; }
}

public class Order
{
    public string OrderId { get; set; }
    public Customer Customer { get; set; }
}

public class AddressConverter : IPropertyConverter
{
    public DynamoDBEntry ToEntry(object value)
    {
        return new Primitive(JsonConvert.SerializeObject(value));
    }

    public object FromEntry(DynamoDBEntry entry)
    {
        return JsonConvert.DeserializeObject(entry.AsString(), typeof(Address));
    }
}

public class CustomerConverter : IPropertyConverter
{
    public DynamoDBEntry ToEntry(object value)
    {
        var customer = (Customer)value;
        var address = new AttributeValue(new AddressConverter().ToEntry(customer.Address));

        var map = new Dictionary<string, AttributeValue>
        {
            {"CustomerId", new AttributeValue(customer.CustomerId)},
            {"Address", address}
        };

        return new AttributeValue(map);
    }

    public object FromEntry(DynamoDBEntry entry)
    {
        var map = entry.M;

        return new Customer
        {
            CustomerId = map["CustomerId"].S,
            Address = (Address)new AddressConverter().FromEntry(map["Address"].S)
        };
    }
}

public class OrderConverter : IPropertyConverter
{
    public DynamoDBEntry ToEntry(object value)
    {
        var order = (Order)value;
        var customer = new AttributeValue(new CustomerConverter().ToEntry(order.Customer));

        var map = new Dictionary<string, AttributeValue>
        {
            {"OrderId", new AttributeValue(order.OrderId)},
            {"Customer", customer}
        };

        return new AttributeValue(map);
    }

    public object FromEntry(DynamoDBEntry entry)
    {
        var map = entry.M;

        return new Order
        {
            OrderId = map["OrderId"].S,
            Customer = (Customer)new CustomerConverter().FromEntry(map["Customer"].M)
        };
    }
}