Fix nested flexible

[Gil-1]

It allows to get the right model when there is nested flexible.

[toonvandenbos]

What does $this->model contain in your case ? Is it a resource ?

[Gil-1]

Hello Toon, this is the model that needs to be associated with the media using spatie laravel media library.
When using a nested flexible $this->model doesn't return the right model. The code proposed fix this.

[harmenjanssen]

I see what you're doing here. I also have some trouble getting the right model back in case of nested layouts supporting media.

In my case I can fix it with a custom accessor method:

    public function getSlidingCardsAttribute()
    {
        return $this->flexible('sliding_cards', [
            'sticky_story_sliding_card' => StickyStorySlidingCard::class,
        ])->tap(fn(Collection $cards) => $cards->each->setModel($this->model));
    }

What's happening here is that sliding_cards is a Flexible field, inside another Flexible field. It has to support media via the HasMedia class (otherwise I get an error that the original model cannot be found), but that also blocks child layouts from retrieving the media correctly (because the model they get back is the parent Layout and not the outermost model, which is what is stored in the media table under model_type).

The tap call above ensures child layouts get the model of the parent layout, thus matching the model_type in the table again.

(I do wonder whether model->model is enough here; what if the Flexible field is nested twice?)

[harmenjanssen]

Hmm, sorry, this will fail in CMS context because $this->flexible() will return an array.

This implementation works inside and outside of Nova:

        $out = $this->flexible('sliding_cards', [
            'sticky_story_sliding_card' => StickyStorySlidingCard::class,
        ]);
        if ($out instanceof Collection) {
            $out->each->setModel($this->model);
        }
        return $out;

[trippo]

Please use this pr #267
because there was an error on import Layout class and getMediaModel method access (there was protected but must be public). This fixes the nested layout problem.