如何使用 spring 数据 mongorepository 方法仅获取选定的 mongo id? [英] How to fetch only selected mongo ids using spring data mongorepository method?

问题描述

我正在尝试这个，它一次只对一个 ID 有效.我想添加 ID 列表.

I am trying this, it works for only one id at a time. I want to add list of ids.

public interface collectionRepository extends MongoRepository<collection, String> {
    
    List<collection> findByIds(List<UUID> id);
}

有人可以提出一些想法吗?提前感谢您的帮助！

Could anyone suggest some ideas?Thank you for your help in advance!

推荐答案

这适用于 POJO 类如下的情况:

This works for a case where the POJO class is like:

public class User {

    private String id;
    private String firstName;
    private String lastName;
    // constructors (including default), get/set methods, etc.
}

并且，文档存储在集合 user 中，例如:

And, the documents are stored in a collection user as, for example:

{ "_id" : ObjectId("604827bf8187ce707fb88681"), "firstName" : "John", "lastName" : "Doe", "_class" : "com.example.demo.User" }

具有获取具有提供的 id 列表的对象的方法的存储库:

The repository with the method to fetch the objects with the supplied list of ids:

public interface UserRepository extends MongoRepository<User, String> {

    @Aggregation(pipeline = { " { '$match': { '_id': { '$in':  ?0  } } }" } )
    List<User> findByIdsIn(List<String> ids);
}

对存储库方法的调用:

List<String> inputIds = Arrays.asList("604827d13de5773133374acc", "604827617a40155f5111b9ff");
List<User> outputList = userRepository.findByIdsIn(inputIds);

outputList 有 两个 文档与变量 inputIds 中的 id 匹配.

The outputList has the two documents matching the ids from the variable inputIds.

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