Edit slugs

[LimeBlast]

Hi, I'm using Sluggable Behavior on my project, and I love it - but I have a question.

Upon adding to the database the slug gets generated automatically, but if editing a post, it doesn't. I.e. if I create a record, then go in to edit it, delete the text from the slug field, then save it, a new slug isn't generated.

Is there anyway that I can change this? I.e. if a slug exists when updating a record, leave it as it is, but if editing a record, upon deleting the slug, having a new one generated from the title.

I hope you know what I mean.

Thank you