Category/subcategory Design

Yii 1.1 General Discussion
1

I have both categories and subcategories on the site, which both stored in the same table:


tbl_category


id    parentId     title

For categories parentId is zero, for subcategories it has non-zero value.

Now comes the question. Should I use single model for both categories and subcategories, or should I introduce two models?

2

I would use the same model. Less maintenance issues