Spring mongodb @DBRef 查询以在基本查询中搜索父字段

Question

How can query mongodb to search all publications where author first name is "Vinod"?

Here is my Publication Class

@Document(collection = "publications")
public class Publication {

    @Id
    private String id;

    private String title;

    private Date publicationDate;

    @DBRef
    private Author author;

    //getter and setters here
}

And my author class is

@Document(collection = "authors")
public class Author {

    @Id
    private String id;

    @Indexed(unique = true)
    private String username;

    private String firstName;

    private String lastName;

    //getter and setters here
}

This is how it is stored in the database.

Publication

{
  "_id" : ObjectId("5a339cc4e193d31c47916c2c"),
   "_class" : "com.publication.models.Publication",
  "title" : "Some title",
  "publicationDate" : ISODate("2017-12-15T09:58:28.617Z"),
  "author" : {
    "$ref" : "authors",
    "$id" : ObjectId("5a339cc0e193d31c47916ad0")
  }
}

And author:

{
  "_id" : ObjectId("5a339cc0e193d31c47916ad0"),
  "_class" : "com.publication.models.Author",
  "username" : "abcd0050",
  "firstName" : "Vinod",
  "lastName" : "Kumar"
}

This is how I need to query.

BasicQuery query = new BasicQuery("{ author.name : 'vinod' }");
Publication test = mongoOperation.find(query, Publication.class);

Answer 1

This should work

Query query = Query.query(new Criteria("author.name", "vinod"));
Publication test = mongoOperation.find(query, Publication.class);

You could also do

BasicQuery basicQuery = new BasicQuery().addCriteria(new Criteria("author.name", "vinod"))

Answer 2

我建议您使用 RelMongo，它是一个构建在 Spring Data 之上的小框架，允许以 JPA 方式将 @OneToMany 和 @OneToOne 注释与 MongoDB 集合一起使用