How to create slug from title or slug field

[vinacms]

Hello,

I want automatic create slug from title or slug field. How to config it?

[shadoWalker89]

Well you can do this, as i did

public function sluggable()
    {
        return [
            'slug' => [
                'source' => ! empty($this->slug) ? 'slug' : 'title'
            ]
        ];
    }

But the problem is that the package doesn't support having the source and destination field the same.
I actually opened an issue about this #270

[cviebrock]

Again, I'm not sure why you want to create a slug from a slug field. If you did source=>title, then it would store the generated slug in the slug field. If you save the model again (changing some other attribute), then the slug field will remain the same.

The package won't slug a model if the destination attribute has a value. This is to prevent slugs from constantly being calculated (and possibly overwritten) in cases where they shouldn't be. You don't want your post URLs changing randomly, right? ;)

If you want to regenerated a slug field from the source, set $model->slug = null before saving.

See #270 for more discussion on source and dest fields being the same. I'm still not convinced this is a use-case for the package (but I'm happy to review a PR that adds that functionality).