在Rails(和其他MVC框架)中拥有非常大的控制器是不好的做法吗?

I'm a student and have been learning rails on my own time. So far, I'm able to develop simple applications that only perform standard database operations. Currently, I'm attempting to increase my knowledge and seeing how I can make applications that actually "do things" rather than just being simple database skins.I'm a student and have been learning rails on m