MongoDB和Asp Core仅更新一个键:值对而不是整个模型

问题描述

在我们的应用程序中，我们有一个链接到mongoDB数据库的用户模型.我的问题是关于仅修改给定用户数据中键/值对中的一个值(当然使用用户ID).

In our app we have a user model linked to a mongoDB database. My question is about modifying only a value from key/value pair inside a given user data (of course using the User ID).

这是我的简单模型:

public class User
    {
        [BsonId]
        public string Id { get; set; }
        public string email { get; set; } = string.Empty;
        public bool hasAcceptedTerms { get; set; } = false;
        public int state { get; set; } = 0;
        public int UserId { get; set; } = 0;
        public IList<UserFile> SubmittedFiles { get; set; }
    }
    public class UserFile
    {
        public int fileID { get; set; }
        public bool hasFile { get; set; }
    }

在我们的应用中，首次验证用户身份后，我们使用以下方法在Mongo数据库中创建其条目

On our app, after authenticate the user for the first time, we create his entry in the Mongo Database using

public async Task AddUser(User item)
        {
            await _context.Users.InsertOneAsync(item);
        }

首次登录后，我们要更新他接受条款的事实:通过这样做，我们希望将hasAcceptedTerms更改为true并将state键从0移到1.

After his first login we want to update the fact he accepted Terms: by doing so we want to change hasAcceptedTerms to true and move the state key from 0 to 1.

目前，在我们的存储库中，我们有类似的东西:

For the moment in our Repository we have something like:

public async Task<UpdateResult> UpdateUser(string id, User item)
{
    return await _context.Users
                         .ReplaceOneAsync(n => n.Id.Equals(id)
                                             , item
                                             , new UpdateOptions { IsUpsert = true });
}

但是这样做，我们必须提供与我们的模型相对应的完整项目.

But by doing so we must provide a full item corresponding to our model.

我找不到创建可以使用的函数的任何方法:

I don't find any way to create a function which I could use like:

UdateUserData(string id, string data, bool newvalue);

例如，调用UpdateUserData('user1objectidhash', 'hasAcceptedTerms', true)会为由其ObjectID ID标识的用户修改正确的值.

For example call UpdateUserData('user1objectidhash', 'hasAcceptedTerms', true) would modify the correct value for the user identified by his ObjectID Id.

• 第一个问题:是否将data键入为string是一个好主意/独特的解决方案??通过将数据键键入为字符串，我发现函数调用并不优雅. li>
• 第二个:我不知道newvalue的类型是什么，因为它取决于我要修改的数据.我可以从模型中检测到它吗?
• 第3名:我不知道可以处理此更新的正确的Mongo.Driver函数.

• First problem: is typing data as string a good idea/unique solution? I don't find my function call being elegant by typing the data key as a string.
• 2nd: I don't know what will be the type of newvalue because it will depend on what is the data I want to modify. Can I detect it from model?
• 3rd: I don't know the correct Mongo.Driver function which can process this update.

能给我一些提示和提示吗?

Could you give me some cues and tips?

推荐答案

如果您只想更新整个对象，而不是某些属性，则可以执行以下Update命令:

If you just want to update not whole object, but some properties it's possible to do this Update command:

collection.UpdateOneAsync(x=>x.Id ==id,
        Builders<User>.Update.Set(u=>u.hasAcceptedTerms, false)
                             .Set(u=>u.state, 1));

我认为，该集合是您的IMongoCollection<User>，您所说的是_context.Users

I assume, that collection is your IMongoCollection<User> , that you mean with _context.Users

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