Configure Multiple MongoDB repositories with Spring Data Mongo

Question

I have 2 Mongodb databases connected to a Spring Boot app with 2 MongoTemplate-s:

mongoTemplate (the default bean name, connects to default db)

mongoAppTemplate (connects to another database on run-time)

I have a lot of MongoRepository-s that use mongoTemplate but I also want to create some that would use mongoAppTemplate.

How can I configure 2 MongoRepository-s to use different MongoTemplate -s with Java configuration ?

I found a way to do it with XML (link below), but I really want to keep it all annotation based

Spring-data-mongodb connect to multiple databases in one Mongo instance

Solution

The base idea is to separate the package hierarchy that contains your repositories into two different paths:

• com.whatever.repositories.main package for the main db repository interfaces
• com.whatever.repositories.secondary package for the other db repository interfaces

Your XML configuration should be something such as:

<mongo:repositories base-package="com.whatever.repositories.main" mongo-template-ref="mongoTemplate"/>
<mongo:repositories base-package="com.whatever.repositories.secondary" mongo-template-ref="mongoAppTemplate"/>

EDIT

@EnableMongoRepositories annotation is not @Repeatable, but you can have two @Configuration classes, each annotated with @EnableMongoRepositories in order to achieve the same using annotations:

@Configuration
@EnableMongoRepositories(basePackages = "com.whatever.repositories.main", mongoTemplateRef = "mongoTemplate")
public class MainMongoConfig {
    ....
}

@Configuration
@EnableMongoRepositories(basePackages = "com.whatever.repositories.secondary", mongoTemplateRef = "mongoAppTemplate")
public class SecondaryMongoConfig {
    ....
}

And a third @Configuration annotated class which @Import the other two.

Comments

[Miciurash]

Can the same result be achieved through annotations?

[Camilo Crespo]

@orid Wondering if this approach is taken, adding a third @Configuration annotated class is redundant? Otherwise skipping the @Configuration annotation in the first two classes and then consolidating into a third class

[s1moner3d]

How to dynamically configure it? I mean, I have a list of templates, and want to use one of them based on certain conditions.

[JaskeyLam]

Then at last, how to inject a MongoRepository instance to my service? would you please compete the whole sample? Thank you!

[devanathan]

Hi @OriDar, Is there any way to switch between the two mongo database in the same instance via repository pattern?

[heez]

Super important note here: The MongoRepository interfaces MUST be in different packages. I also didn't need a 3rd class.