Upsert Mongo Document using spring data mongo

Question

I have a Class

@Document
public class MyDocument {
   @Id
   private String id;
   private String title;
   private String description;
   private String tagLine;

   @CreatedDate
   private Date createdDate;

   @LastModifiedDate
   private Date updatedDate;

   public String getId() {
     return id;
   }
   public void setId(String id) {
     this.id = id;
   }

   public String getTitle() {
     return title;
   }

   public void setTitle(String title) {
     this.title = title;
   }

   public String getDescription() {
     return description;
   }

  public void setDescription(String description) {
    this.description = description;
  }
  public String getTagLine() {
     return tagLine;
   }

  public void setTagLine(String tagLine) {
    this.tagLine = tagLine;
  }
}

i have added annotated application with @EnableMongoAuditing

i have created interface which implements mongorepository

public interface MyDocumentRepository extends MongoRepository<MyDocument, String> { }

when i have created RestController with GET,POST,PATCH methods in POST I'm sending {'title':'first'}

Controller Class POST method is

@RequestMapping(value = "/", method = RequestMethod.POST)
public ResponseEntity<?> saveMyDocument(@RequestBody MyDocument myDocument) { 
   MyDocument doc = myDocumentRepo.save(myDocument);
   return new ResponseEntity<MyDocument>(doc, HttpStatus.CREATED);
}

Its saving the data in mongo.

{
    "_id" : ObjectId("56b3451f0364b03f3098f101"),
    "_class" : "com.wiziq.service.course.model.MyDocument",
    "title" : "test"
}

and PATCH request is like

@RequestMapping(value = "/{id}", method = RequestMethod.PATCH)
public ResponseEntity<MyDocument> updateCourse(@PathVariable(value = "id") String id,
        @RequestBody MyDocument myDocument) {
    myDocument.setId(id);
    MyDocument doc = courseService.save(myDocument);
    return ResponseEntity.ok(course);
}

when in make PATCH request with data {"description":"This is test"} it update the docuent BUT it removes title field and createdDate form the document, its doing update which is ok. But i wanted to do an upsert, i can do its using mongoTemplate, but there i have to set each property which i want to set.

Is there any generic way to that if i get a PATCH request i can update only not null properties.. properties which are coming in request

spring-data-rest seems to do it using @RepositoryRestResource. How can i achieve the same.

I don't want to code like this Update update = new Update().set("title", myDocument.getTitle()).set("description", myDocument.getdescription());

Answer 1

Unfortunately its the behavior in MongoDB, you can verify the same using shell. So to update create an Update Object and using

Query query = new Query(Criteria.where("id").is(ID)); 

Here ID is the document which you want to update.Based on your requirement set upsert after that using findAndModify update document.

mongoTemplate.findAndModify(query, update,
                new FindAndModifyOptions().returnNew(true).upsert(false),
                someclass.class);