How to specify collection name while using spring data mongo repository? - spring-data

Question

I am using spring data to fetch data for my application.
The repository class uses a mongo entity class which is being added as an upstream dependency to my project which means I don't have any control to change the source code of the class. As a result of this, I cannot use #Document annotation from org.springframework.data.mongodb.core.mapping to my mongo entity class.
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.mongodb.repository.MongoRepository;
public interface DummyRepository extends MongoRepository<Dummy, String> {
Page<Dummy> findAll(Pageable pageable);
}
Here, I don't have any control over source code of Dummy class so I can't add #Document to specify collection name for this class
How can I specify the collection name while using DummyRepository to query mongo collection?

Answer 1

One way would be to use #EnableMongoRepositories#repositoryFactoryBeanClass with your own flavor of MongoRepsoitoryFactoryBean overriding getEntityInformation(Class).
Unfortunately there's a bug (DATAMONGO-2297) in the code and for the time being you also need to customize getTargetRepsoitory(RepositoryInformation) as shown in the snippet below.
#Configuration
#EnableMongoRepositories(repositoryFactoryBeanClass = CustomRepoFactory.class)
class config extends AbstractMongoConfiguration {
// ...
}
class CustomRepoFactory extends MongoRepositoryFactoryBean {
public CustomRepoFactory(Class repositoryInterface) {
super(repositoryInterface);
}
#Override
protected RepositoryFactorySupport getFactoryInstance(MongoOperations operations) {
return new MongoRepositoryFactory(operations) {
#Override
public <T, ID> MongoEntityInformation<T, ID> getEntityInformation(Class<T> domainClass) {
return new MappingMongoEntityInformation(
operations.getConverter().getMappingContext().getPersistentEntity(domainClass)) {
#Override
public String getCollectionName() {
return "customize-as-you-wish";
}
};
}
#Override // you should not need this when DATAMONGO-2297 is resolved
protected Object getTargetRepository(RepositoryInformation information) {
MongoEntityInformation<?, Serializable> entityInformation = getEntityInformation(information.getDomainType());
return getTargetRepositoryViaReflection(information, entityInformation, operations);
}
};
}
}