Add getMorphAlias to \Illuminate\Database\Eloquent\Relations\Relation Class, get morph key by model class name.

[mouyong]

Background

Some times, we need to find the morphed alias by model class.

hope to use Relation::getMorphAlias(\App\Models\Xxx::class) get it.

code

\Illuminate\Database\Eloquent\Relations\Relation::macro('getMorphAlias', function ($value) {
    if (is_object($value)) {
        $value = get_class($value);
    }
    
    $morphMap = \Illuminate\Database\Eloquent\Relations\Relation::morphMap();

    $flipMorphed = array_flip($morphMap);

    $alias = $flipMorphed[$value] ?? throw new \RuntimeException("Please add class $value to \Illuminate\Database\Eloquent\Relations\Relation::enforceMorphMap");

    return $alias;
});

Example

$id = 1;
$class = \App\Models\Organization::class;
$classAlias = Relation::getMorphedAlias($class);

ImageCover::create([
    'coverable_id' => $id,
    'coverable_type' => $classAlias,
]);

AppServiceProvider.php

    public function register()
    {
        \Illuminate\Database\Eloquent\Relations\Relation::macro('getMorphedAlias', function ($value) {
            $morphMap = \Illuminate\Database\Eloquent\Relations\Relation::morphMap();

            $flipMorphed = array_flip($morphMap);

            $alias = $flipMorphed[$value] ?? null;

            return $alias;
        });

        // ImageCover
        \Illuminate\Database\Eloquent\Relations\Relation::enforceMorphMap([
            \App\Models\ImageCover::CONVERABLE_ORGANIZATION => \App\Models\Organization::class,
        ]);
    }

[dan-scott-dev]

The getMorphClass() method (available on models) returns the alias... unless I'm doing something wrong! I have noticed the method has the word 'class' in it and not 'alias'!

In any case, I have this in the boot method of my AppServiceProvider:

Relation::morphMap([
            'entity' => Entity::class,
        ]);

And then Entity:find(1)->getMorphClass() returns 'entity'