如何在数组(数组中的对象)中查找和更新项目{Accounts [x] .Items [y] .StatusCode = ...}

Question

我有一个简单的嵌套数组(如下).我的目标是将这些项目在C#中表示为"帐户"对象,其中包含"项目"列表以及其他帐户信息.我可以在MongoDB中设置这个结构,但我不知道如何在单个帐户上的单个项目上更新StatusCode.

{  
   "Accounts":[  
      {  
         "Name":"SomeName1",
         "Email":"email1@site.com",
         "OwnedItems":[  
            {  
               "ItemId":55,
               "StatusCode":1
            },
            {  
               "ItemId":12,
               "StatusCode":2
            }
         ]
      },
      {  
         "Name":"SomeName2",
         "Email":"email2@site.com",
         "OwnedItems":[  
            {  
               "ItemId":100,
               "StatusCode":3
            },
            {  
               "ItemId":101,
               "StatusCode":4
            }
         ]
      }
   ]
}

我的问题是如何使用此设置查询和更新特定的StatusCode？

基本上我想做的是以下内容.当然,以下代码实际上不会更新数据库.

public void Update_StatusCode(string accountName, int itemId, int newStatusCode)
{
    var foundAccount = collection.Find(Builders<AccountSave>.Filter.Eq(acc => acc.Name, accountName)).FirstOrDefaultAsync().Result;
    foreach (var item in foundAccount.OwnedItems)
    {
        if (item.ItemId == itemId)
            item.StatusCode = newStatusCode;
    }
}

编辑:澄清一下,我正在使用2.0驱动程序.此外,是的,我知道没有'_id'.举个例子,假设他们使用得当.

Answer 1

你可以加入条件

public async Task UpdateStatus(string accountName, int itemId, int newStatusCode)
{
    var filter = Builders<Account>.Filter.And(
        Builders<Account>.Filter.Where(x => x.Name == accountName),
        Builders<Account>.Filter.ElemMatch(x => x.OwnedItems, x => x.ItemId == itemId));

    var update = Builders<Account>.Update.Set("OwnedItems.$.StatusCode", newStatusCode);
    await collection.UpdateOneAsync(filter, update);
}