MongoDB GORM - Inheritance mapping Tips ref: http://qiita.com/yuki-takei/items/2b173dea5c45de44fcb8

AbstractUser.groovy

abstract class AbstractUser {

    static mapWith = "mongo"
    static mapping = {
        name index: true
    }
    static constraints = {
        desc nullable: true
    }

    String name
    String desc

    def beforeInsert() {
        doSomething()
    }

    def afterLoad() {
        doSomething()
    }

}

ActiveUser.groovy

class ActiveUser extends User {
    static mapping = {
        collection "activeUser"     // 無視される
    }
}

file5.txt

"_class": "ActiveUser",

file9.txt

"_class": "ActiveUser",

InactiveUser.groovy

class InactiveUser extends User {
    static mapping = {
        collection "inactiveUser"   // 無視される
    }
}

User.groovy

class User {
    static mapWith = "mongo"
    static mapping = {
        collection "user"
    }
}