Repository query with a List parameter in Spring Data MongoDB

I have the following POJO.

@Document(collection = "questions")
public class Question {

@Id
private String id;

public List<String> getTags() {
return tags;
}

public void setTags(List<String> tags) {
this.tags = tags;
}
}


I am trying to implement a `MongoRepository` query which finds all `Question`s that contain a list of tags. I have tried the following:

@Repository
public interface QuestionRepository extends MongoRepository<Question, String> {
List<Question> findByTags(List<String> tags);
}
but this is only working when the `List` of tags that I'm passing to the method fully matches the list of tags assigned to the question in Mongo. E.g. if I have a question in Mongo with a list of tags `[ "t1", "t2", "t3" ]` it is not returned by `findByTags(List)` when I pass `[ "t1", "t2" ]` to the method.

I have tried the following as well:

@Repository
public interface QuestionRepository extends MongoRepository<Question, String> {
@Query("{ tags: { $all: ?0 } }")
List<Question> findByTags(List<String> tags);
}

but then my `war` could not be deployed to my servlet container at all. (I get the following error in that case:

The web application [backend] appears to have started a thread named [cluster-1-db:27017] but has failed to stop it. This is very likely to create a memory leak.

Would you please advise on how to implement that custom query?

I will answer my own question as I have just found the answer by myself. The following section in the Spring Data MongoDB documentation lists all supported keywords that are used by Spring for its query derivation:

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The following implementation works for the use case described above:

@Repository
public interface QuestionRepository extends MongoRepository<Question, String> {
List<Question> findByTagsIn(List<String> tags);
}

The CONTAINING keyword may also be used:

@Repository
public interface QuestionRepository extends MongoRepository<Question, String> {
List<Question> findByTagsContaining(List<String> tags);
}


example and how it's mongo query looks like:

findByAddressesContaining(Address address)

{"addresses" : { "$in" : address}}

This can also accept list of address in params.

See documentation:

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