Spring Data Mongo:如何按字段返回嵌套对象? [英] Spring Data Mongo: How to return nested object by its field?

问题描述

我有域名:

class Company {
    List<Job> jobs;
}

有没有办法从集合中返回嵌套对象，例如:

Is there a way to return nested object from collection like:

@Repository
public interface CompanyRepository extends MongoRepository<Company, String>{
    Job findByJobId(String jobId);
}

推荐答案

我必须对 Job 模型的结构做出一些假设，但假设如下:

I have to make some assumptions about the structure of your Job model, but assuming something like this:

public class Job {
    private String id;
    // other attributes and methods
}

... 并且假设这个模型嵌入在你的 Company 模型中，而不是在另一个集合中表示，你将不得不通过 MongoTemplate 路由去自定义实现.Spring Data 查询 API 将无法弄清楚如何获取您想要的内容，因此您必须自己实现该方法.

... and assuming that this model is embedded in your Company model, and not represented in another collection, you will have to go the custom implementation via MongoTemplate route. The Spring Data query API is not going to be able to figure out how to get what you want, so you must implement the method yourself.

@Repository
public interface CompanyRepository extends CompanyOperations, MongoRepository<Company, String>{
} 

public interface CompanyOperations {
    Job findByJobId(String jobId);
}

public class CompanyRepositoryImpl implements CompanyOperations {
    @Autowired private MongoTemplate mongoTemplate;

    @Override
    public Job findByJobId(String jobId){
        Company company = mongoTemplate.findOne(new Query(Criteria.where("jobs.id").is(jobId)), Company.class);
        return company.getJobById(jobId); //implement this method in `Company` and save yourself some trouble.
    }
}

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