Kotlin – SpringBoot MongoDB – Model One-to-One, One-to-Many Relationships Embedded Documents
With MongoDB, we can structure related data by embedded documents. In general, embedding gives a better performance for read operations. So in the tutorial, JavaSampleApproach will show you way to work with Embedded Documents using SpringBoot by Kotlin language.
I. Technologies
– Kotlin 1.2.20
– Apache Maven 3.5.2
– Spring Tool Suite – Version 3.9.0.RELEASE
– Spring Boot – 1.5.10.RELEASE
– MongoDB: v3.4.1
II. MongoDB – Embedded Documents
Embedded Documents are generally known as denormalized models. It is a way to structure related data in a single document. See below diagram:
In general, we decide to design data as embedded models in case: data contains one-to-one or one-to-many relationships between entities.
With embedding data model, in general, it gives us a better performance for read operations. And we can use a single atomic read/write database operation to request and retrieve or update related data.
However, a weakness point is embedding related data in documents may lead to situations where documents grow after creation.
III. Practice
In the tutorial, we use SpringToolSuite to create a Kotlin SpringBoot project for MongoDB embedded documents:
Step to do
– Create Kotlin SpringBoot project
– Create Document models
– Create MongoRepository
– Implement Client
– Run and check results
1. Create Kotlin SpringBoot project
Using Spring Tool Suite, create a Kotlin SpringBoot project. Then open pom.xml file, add dependencies:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>More at:
Kotlin – SpringBoot MongoDB – Model One-to-One, One-to-Many Relationships Embedded Documents
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