[9.x] Improve getter for morphed model alias

[sawirricardo]

Background, I uses polymorphic models heavily in apps, which at times requires to do something like

Relation::enforceMorphMap(['user' => 'App\Models\User']);

Model::query()->whereModelType('user');

now, what if we updated the morph map from 'user' to 'other_user'?

Of couse we can imagine how many code we need to change.

// current way
User::make()->getMorphClass(); // we can do this better
User::morphAlias(); // 😍 returns 'other_user'
Relation::getMorphedModelAlias('App\Models\User') // 👍 also returns 'other_user'

Of course, suggestions are welcomed

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If possible, please consider releasing your code as a package so that the community can still take advantage of your contributions!

If you feel absolutely certain that this code corrects a bug in the framework, please "@" mention me in a follow-up comment with further explanation so that GitHub will send me a notification of your response.

[JamesHemery]

Hi @taylorotwell,

What do you think about just adding this method on HasRelationships trait ?

    public static function morphAlias()
    {
        return (new static)->getMorphClass();
    }

It's a small DX improvement.

I also thought of changing the visibility of getMorphClass as protected, so that it could be called by __call and __callStatic from Model, BUT the method is mocked in several places and this would be a major change.