i try to show details from intermediate table through id rapport but the result is empty

public function show(RapportMP $rapportMP){
       $ligne = DB::table('ligne_rapport_m_p_s')
        ->join('rapport_m_p_s', 'ligne_rapport_m_p_s.rapportMP_id', '=', 'rapport_m_p_s.id')
        ->get()
        ->toArray();
        echo'<pre>';
        print_r($ligne) ;
       
       
}

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i tried to join but nothing work the result is empty .can somoene be able to explain how can i show details of ligne_rapport through id rapport?

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via Chebli Mohamed