Newbie Here. Classes extending Classes

[eluser]Unknown[/eluser]
So I'm learning this OOP or MVC stuff, and CI all at the same time and just have a question.

I want to make a website with a searchable DB for all the items in a game. I'm fresh out of the short tutorial in the docs and trying to plan my project.

I'm wondering if I can or should set up my model classes like this:

Code:

class Items_model extends CI_Model {}

class Armor_model extends Items_model {}

class Helmet_model extends Armor_model {}

class Gloves_model extends Armor_model {}

class MeleeWeapons_model extends Items_model {}

class Swords_model extends MeleeWeapons_model {}

class Daggers_model extends MeleeWeapons_model {}

Or should they all extend CI_Model only, and in a separate file each?