interface ServerModelStatic<T> {
    getObjects(parentID?: number): Array<T>;
    getObject(ID: number): T;
}

interface ServerModel {
    save(): void;
    delete(): void;
}

class User implements ServerModel {
    ID: number;
    username: string;
    games: Array<Game>;

    save() {}
    delete() {}
}

class Game implements ServerModel {
    ID: number;
    name: string;
    roles: Array<Role>;
    resources: Array<Resource>;

    save() {}
    delete() {}
}

class Role implements ServerModel {
    ID: number;
    name: string;
    resources: Array<Resource>;

    save() {}
    delete() {}
}
class Resource implements ServerModel { ID: number;
    name: string;
    initialValue: number;
    step: number;
    minValue: number;
    maxValue: number;

    save() {}
    delete() {}
}