在为 LINQ cosmos 数据库建模时，我应该创建 "Id" 属性吗？

Question

假设我要创建以下文档

{
    "Id": "6a23a5f3-0f77-40a9-b9f9-26e88537a962",
    "CarHistory": [
        { "model":"ford", "price": 100, "kilometers": 100  "current": true },
        { "model":"ford", "price": 200, "kilometers": 200, "current": false },
    ]
}

在 Poco 中，我猜该模型可能看起来像以下几行：

public class Document
{
    public Guid Id { get; set; }
}

public class Car : Document
{
    public string Model {get; set;}
    public decimal Price {get; set;}
    public int Kilometers {get; set;}
    public bool Current {get; set;}
}

所以后来我创建..

public class MasterCar : Document
{
    public ICollection<Car> CarHistory { get; set; } = new List<Car>();
}

调试时似乎一切正常：我在服务中的某处以编程方式创建 Guid，例如：

var masterCar = new MasterCar(){ Id = Guid.NewGuid() }

但是当我进入 cosmos db 模拟器和一个 SELECT * FROM 时，我检查了 Id 属性它的值是：

"id": "00000000-0000-0000-0000-000000000000",

谁能指出我做错了什么？或者这应该如何完成，我读到您不应该自己提供 Id，但是我怎样才能以编程方式访问 Id 属性呢？例如：

CarService.GetById(Car.Id); //Id property doesnt exist if there is no property in poco

Answer 1

下面是我的测试代码，你可以试试：

Document.cs

public class Document
{
    [JsonProperty("id")]
    public Guid Id { get; set; }
}

Car.cs

public class Car
{
    [JsonProperty("model")]
    public string Model { get; set; }

    [JsonProperty("price")]
    public decimal Price { get; set; }
    [JsonProperty("kilometers")]
    public int Kilometers { get; set; }
    [JsonProperty("current")]
    public bool Current { get; set; }

    public override string ToString()
    {
        return JsonConvert.SerializeObject(this);
    }
}

硕士Car.cs

public class MasterCar : Document
{
    public ICollection<Car> CarHistory { get; set; } = new List<Car>();

    public override string ToString()
    {
        return JsonConvert.SerializeObject(this);
    }
}

创建和搜索：

        var guid = Guid.NewGuid();
        var masterCar = new MasterCar() { Id = guid };
        var car = new Car() { Model = "ford", Price = 100, Kilometers = 100, Current = true };
        var car2 = new Car() { Model = "ford", Price = 200, Kilometers = 200, Current = false };
        var carHistory = masterCar.CarHistory;
        carHistory.Add(car);
        carHistory.Add(car2);

        CosmosClient client = new CosmosClient(connection_string);
        Container container = client.GetContainer(databaseId, containerName);
        await container.CreateItemAsync<MasterCar>(masterCar);

        ItemResponse<MasterCar> itemResponse =  await container.ReadItemAsync<MasterCar>(guid.ToString("D"), new PartitionKey(guid.ToString("D")));
        Console.WriteLine(itemResponse.Resource.ToString());

结果：

在为 LINQ cosmos 数据库建模时，我应该创建 "Id" 属性吗？

Should I create the "Id" property when modeling a LINQ cosmos db?

c#

azure

azure-cosmosdb

azure-cosmosdb-sqlapi

在为 LINQ cosmos 数据库建模时，我应该创建 "Id" 属性 吗？

Should I create the "Id" property when modeling a LINQ cosmos db?

c#

azure

azure-cosmosdb

azure-cosmosdb-sqlapi

在为 LINQ cosmos 数据库建模时，我应该创建 "Id" 属性吗？