Exposed objects

The Messages object provides the mapping between the object and the database and it represents the structure of the table. It is required by the Exposed library:

    /**
      * Message table structure 
      */
    object Messages : Table() {
      val id = integer("id").autoIncrement().primaryKey()
      val content = text("content")
      val location = point("location").nullable()
    }

The following is a diagram of the Message class and the Messages object required for the Exposed library:

We have specified our Messages object for Exposed in the Database.kt file. It is recommended to specify all your Exposed objects in a single Kotlin file for easier maintenance.