public function expertiseNotContainedByAdvisor($advisor_id) { if ($this->expertiseContainedByAdvisor($advisor_id) == null) { $expertiseNotContainedByAdvisor = Expertise::lists('title', 'id'); return $expertiseNotContainedByAdvisor; } $expertiseNotContainedByAdvisor = Expertise::whereNotIn('id', $this->expertiseContainedByAdvisor($advisor_id, 1))->where('requested', '!=', true)->orderBy('title')->lists('title', 'id'); return $expertiseNotContainedByAdvisor; }