Eloquent support for a two-way polymorphic pivot table

MorphToManyByMany.php

class AppServiceProvider
{
    /**
     * @void
     */
    protected function boot()
    {
        Relation::macro('setMorphTables', function ($foreignPivotTypeField, $relatedPivotTypeField = null) {
            /** @var MorphToMany $this */

            $parent = $this->getParent();
            $this->where($foreignPivotTypeField, $parent->getMorphClass());

            if ($relatedPivotTypeField) {
                $qualifiedTypeField = $this->getTable().'.'.$this->getMorphType();
                $this->morphType = $relatedPivotTypeField;

                /** @var EloquentBuilder $eloquentBuilder */
                $eloquentBuilder = $this->getQuery();
                $queryBuilder = $eloquentBuilder->getQuery();

                //Correct the wheres already created with incorrect assumptions about the pivot field names
                foreach ($queryBuilder->wheres as $index => $where) {
                    if (isset($where['column']) && $where['column'] === $qualifiedTypeField) {
                        $queryBuilder->wheres[$index]['column'] = $this->getTable().'.'.$relatedPivotTypeField;
                    }
                }
            }

            return $this;
        });
    }
}