MongoDB ：仅更新集合中的那些 'Id' 存在于列表中的对象

Question

我有一个 MongoDb 集合需要更新。该集合的 JSON 对象由几个元素组成，'Id' 是其中之一。现在，我只需要更新此集合中那些 'Id' 与我在临时列表 'TempList'.

中的对象相匹配的对象

我试过这样做，（见下文并注意 'filter' 参数）但它抛出一个错误，

await MyAccounts.UpdateManyAsync(w => TempList.Any(y => y.Id == w.Id),
        Builder.Update
        .Set(w => w.Elem1, blah1)
        .Set(w => w.Elem2, blah2) 
        .AddToSet("Elem3", blah3));

感谢任何帮助！

Answer 1

您需要制作 tempList ID 列表而不是对象列表才能使以下内容正常工作。

            var filter = Builders<MyAccount>.Filter
                            .Where(a => tempList.Contains(a.Id));

            var update = Builders<MyAccount>.Update
                            .Set(a => a.Elem1, "blah1")
                            .Set(a => a.Elem2, "blah2")
                            .AddToSet("Elem3", "blah3");

            collection.UpdateMany(filter, update);

这是一个测试程序：

using MongoDB.Entities;
using MongoDB.Entities.Core;
using System.Linq;

namespace Whosebug
{
    public class Account : Entity
    {
        public string Elem1 { get; set; }
        public string Elem2 { get; set; }
    }

    public class Program
    {
        private static void Main(string[] args)
        {
            new DB("test", "localhost");

            (new[]
            {
                new Account{
                 Elem1 = "first-elem1",
                 Elem2 = "first-elem2"
                },
                new Account{
                 Elem1 = "second-elem1",
                 Elem2 = "second-elem2"
                },
                new Account{
                 Elem1 = "third-elem1",
                 Elem2 = "third-elem2"
                }
            }).Save();

            var tempList = DB.Queryable<Account>()
                             .Select(a => a.ID)
                             .Take(2)
                             .ToList();

            DB.Update<Account>()
              .Match(a => tempList.Contains(a.ID))
              .Modify(a => a.Elem1, "blah1")
              .Modify(a => a.Elem2, "blah2")
              .Modify(a => a.AddToSet("Elem3", "blah3"))
              .Execute();
        }
    }
}

MongoDB ：仅更新集合中的那些 'Id' 存在于列表中的对象

MongoDB : Update only those objects in a collection whose 'Id' exists in a list

linq

mongoose

mongodb

node.js

c#-4.0