public static final Blog dao = new Blog().dao();
    public User getUser() {
       return User.dao.findById(get("user_id"));
}
public class User extends Model<User>{
    public static final User dao = new User().dao();
    public List<Blog> getBlogs() {
       return Blog.dao.find("select * from blog where user_id=?", get("id"));
    }
}