EloquentFilter\ModelFilter::filterRelations PHP Method

    public function filterRelations()
    {
        // Verify we can filter by relations and there are relations to filter by
        if ($this->relationsEnabled()) {
            foreach ($this->getAllRelations() as $related => $filterable) {
                // Make sure we have filterable input
                if (count($filterable) > 0) {
                    if ($this->relationIsJoined($related)) {
                        $this->filterJoinedRelation($related);
                    } else {
                        $this->filterUnjoinedRelation($related);
                    }
                }
            }
        }
        return $this;
    }