query function laravel with relationship

   $other_count = UserActivity::where('user_id', $user_id)

        ->whereBetween('activity_date', [$start_date, $end_date])

        ->where('activity_type', '!=', 1)

        ->where('activity_type', '!=', 2)

        ->where('annual_training_program_id', $request->annual_training_program_id)

        ->where('annual_training_program_week_id', $request->annual_training_program_week_id)

        ->whereHas('activity',function($q){

            $q->whereNull('sport_id');

        })

Hello

->whereHas('activity')

activity is the relation name