CODEWITHSUNDEEP
javaspringmongodbspring-dataspring-data-mongodb
user5685250
user5685250

Reputation: 94

Change or override default Behavior of Mongorepository.save(document)

Is there any way to intercept or change the document before MongoRepository.save(e) updates it?

I am trying to push a subproperty inside and array in a document. I have tried to manipulate DBObjects by implementing converter(using custom converter) but the $push operation did not work over there.

I think to make it work I have to implement something like mongoOperation.update(dbObjectMatch,dbObjectUdate).

I found MongoRepositorysave(document) doesn't support partial update, i.e write only the change to an existing document. I want to know the internal code of MongoRepository.save to override the default behavior.

I have implemented MyRepositoryCustom where I can override save by extending the same in MyRepository, which extends MongoRepository<T, ID extends Serializable> and then used mongoTemplate.updateFirst(query,update,Clazz.class) to achieve what I am looking for but I am not satisfied.

Upvotes: 4

Views: 6336

Answers (3)

Yadhukrishna
Yadhukrishna

Reputation: 842

You can fragmentally override the MongoRepository by ensuring you match the signature of method in the custom interface.

E.g. If you want to override save() method, create a new interface like

interface CustomizedSave<T> {
  <S extends T> S save(S entity);
}

Implement this interface:

@Component
class CustomizedSaveImpl<T> implements CustomizedSave<T> {
  //This is optional, I added it to just show you can use it here
  MongoTemplate mongoTemplate;

  @Autowired
  public CustomizedSaveImpl(MongoTemplate mongoTemplate) {
    this.mongoTemplate = mongoTemplate;
  }

  public <S extends T> S save(S entity) {
    // Your custom implementation
  }
}

Extend the interface in the base MongoRepository like

interface UserRepository extends CrudRepository<User, Long>, CustomizedSave<User> {
}

This will ensure only save menthod gets overridden and rest stay as is.

Docs: https://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#repositories.single-repository-behavior

Upvotes: 0

Jens Schauder
Jens Schauder

Reputation: 81862

You have multiple, slightly different questions:

From your title:

Change/Override Default Behaviour of Mongorepository Save() ( S save(S var1)) Method

You can use custom implementations to override the behavior of existing methods in Spring Data repositories. See the reference documentation how to do that. Your last paragraph suggests you already do that. Unfortunately you don't tell us why you aren't satisfied with this.

Is there any way to intercept/change before Mongorepository Save() ( S save(S var1)) method For document update.

Yes a Spring Data MongoDB repository fires various life cycle events for this purpose. Once again, see the reference documentation for details.

I want to know the Internal code of Mongorepository Save

What you are looking for is SimpleMongoRepository.java which delegates for almost all work to MongoTemplate.java

Upvotes: 8

mp911de
mp911de

Reputation: 18119

You're looking for Lifecycle Events.

Overriding repository base methods allows you to interact with the domain object itself but the mapping happens inside of MappingMongoConverter.

Saving an object will fire events such as

These events carry a reference to your saved object. AfterConvertEvent additionally exposes the mapped representation (DBObject) of your object which you can change/enhance.

You can listen to these events by configuring a listener bean such as ApplicationListener<AfterConvertEvent>.

Upvotes: 3

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