![]() We can inject our RestaurantRepository class, Spring will Example Controller class for demonstration IndexController( See this post for an explanation of Spring MVC. Now let’s make a controller class to test our application. Interface RestaurantRepository : MongoRepository Spring will implement our interface for us! Once we have enabled the mongo repositories, we just need to define an interface that extends MongoRespository. All we need to do is annotate a configuration class to make this //Allow Spring to Generate Mongo Repositories Before this can happen, we have to enable mongo repositories. Our next class is a repository class which Spring will generate the implementation for us. It’s used as a property in the Employees database and the persistence provide is able store all of employee objects embedded in Restaurant. The other class is Employee which does not have any annotations at all. This value has to be unique in the database. We also annotate the name field with the Id annotation to mark it as the document id. Our Restaurant class is annotated with to mark it as a persistable class. This class embeds directly into Restaurantĭata class Employee(var name : String = "", Mark this field as the document Id var name : String = "", Let’s begin by creating a couple of data classes to store in our database. The cool part using Mongo with Spring Boot is that there is zero configuration providing you are using default settings. In this example application, we are going to use MongoDB to document Restaurants with any number of employees (of course, a simple example such as this can be done in a relational database, but let’s go with this for simplicity sake). Modeling such a data structure would be difficult in a relational database, but it’s much easier with Mongo. For example, picture a blogging website where users can enter any number of comments or response. MongoDB is incredibly useful in situations where the structure of data isn’t known prior to writing the application. MongoDB is a NoSQL database that works really well with Kotlin and Spring Boot.
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