vendor/illuminate/database/Eloquent/Relations/MorphPivot.php

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<?php

namespace Illuminate\Database\Eloquent\Relations;

use Illuminate\Support\Str;
use Illuminate\Database\Eloquent\Builder;

class MorphPivot extends Pivot
{
    /**
     * The type of the polymorphic relation.
     *
     * Explicitly define this so it's not included in saved attributes.
     *
     * @var string
     */
    protected $morphType;

    /**
     * The value of the polymorphic relation.
     *
     * Explicitly define this so it's not included in saved attributes.
     *
     * @var string
     */
    protected $morphClass;

    /**
     * Set the keys for a save update query.
     *
     * @param  \Illuminate\Database\Eloquent\Builder  $query
     * @return \Illuminate\Database\Eloquent\Builder
     */
    protected function setKeysForSaveQuery(Builder $query)
    {
        $query->where($this->morphType, $this->morphClass);

        return parent::setKeysForSaveQuery($query);
    }

    /**
     * Delete the pivot model record from the database.
     *
     * @return int
     */
    public function delete()
    {
        $query = $this->getDeleteQuery();

        $query->where($this->morphType, $this->morphClass);

        return $query->delete();
    }

    /**
     * Set the morph type for the pivot.
     *
     * @param  string  $morphType
     * @return $this
     */