Relation<>

namespace DB {

class Course : public Model {

public:
    Course()
        : students_(this),
          instructor_(this)
    {
    }

    const std::vector<Student>& getStudents()
    {
        return students_.get();
    }

    const Instructor& getInstructor()
    {
        return instructor_.get();
    }

private:
    Relation<HasMany, DB::Student>    students_;
    Relation<HasOne,  DB::Instructor> instructor_;

};

}