Call to undefined method Illuminate\Database\Eloquent\Relations\HasOneThrough::save()

[sts-ryan-holton]

Hi, I'm trying to clone a model with relations that are MorphToMany but am getting an error on this. My Form model can be associated to many Site models in my project via a model called Siteable. My Siteable table looks like:

Schema::create('siteables', function (Blueprint $table) {
    $table->ulid('id')->primary()->index();
    $table->foreignUlid('site_id')->index()->constrained()->onUpdate('cascade')->onDelete('cascade');
    $table->ulidMorphs('siteable');
    $table->timestamps();

    // define indexes for performance
    $table->index(['site_id', 'siteable_type', 'siteable_id']);
    $table->index('created_at');
});

When trying to clone my Form, with the linked Siteable model, I get an error despite adding the following to my my Form model:

/**
 * Set clonable relations
 *
 * @var string
 */
protected $cloneable_relations = [
    'site'
];

For reference, these are the two relations in my Form:

/**
 * Get the site for the form
 */
public function site(): HasOneThrough
{
    return $this->hasOneThrough(
        Site::class,
        Siteable::class,
        'siteable_id',
        'id',
        'id',
        'site_id'
    )->where('siteable_type', Form::class);
}

/**
 * Get all of the sites for the form.
 */
public function sites(): MorphToMany
{
    return $this->morphToMany(Site::class, 'siteable')->withPivot('id');
}

The error is:

Call to undefined method Illuminate\Database\Eloquent\Relations\HasOneThrough::save()