如何在具有多对多关系的Laravel中实现具有6个外键的表

php artisan make:model Table1
php artisan make:model Table2

php artisan make:model Table1Table2 -m

public function up()
{
    Schema::create('table1_table2', function (Blueprint $table) {
        $table->unsignedBigInteger('table1_id');
        $table->unsignedBigInteger('table2_id');
        $table->unsignedBigInteger('foreign_key1');
        $table->unsignedBigInteger('foreign_key2');
        $table->unsignedBigInteger('foreign_key3');
        $table->unsignedBigInteger('foreign_key4');
        
        $table->foreign('table1_id')->references('id')->on('table1')->onDelete('cascade');
        $table->foreign('table2_id')->references('id')->on('table2')->onDelete('cascade');
        $table->foreign('foreign_key1')->references('id')->on('foreign_table1')->onDelete('cascade');
        $table->foreign('foreign_key2')->references('id')->on('foreign_table2')->onDelete('cascade');
        $table->foreign('foreign_key3')->references('id')->on('foreign_table3')->onDelete('cascade');
        $table->foreign('foreign_key4')->references('id')->on('foreign_table4')->onDelete('cascade');
        
        $table->primary(['table1_id', 'table2_id', 'foreign_key1', 'foreign_key2', 'foreign_key3', 'foreign_key4']);
    });
}

class Table1 extends Model
{
    public function table2()
    {
        return $this->belongsToMany(Table2::class, 'table1_table2', 'table1_id', 'table2_id')
            ->withPivot('foreign_key1', 'foreign_key2', 'foreign_key3', 'foreign_key4');
    }
}

class Table2 extends Model
{
    public function table1()
    {
        return $this->belongsToMany(Table1::class, 'table1_table2', 'table2_id', 'table1_id')
            ->withPivot('foreign_key1', 'foreign_key2', 'foreign_key3', 'foreign_key4');
    }
}

$table1 = Table1::find(1);
$table2 = Table2::find(2);

$table1->table2()->attach($table2, [
    'foreign_key1' => 1,
    'foreign_key2' => 2,
    'foreign_key3' => 3,
    'foreign_key4' => 4,
]);

$table1->table2()->detach($table2);

$table1->table2()->sync([
    $table2->id => [
        'foreign_key1' => 1,
        'foreign_key2' => 2,
        'foreign_key3' => 3,
        'foreign_key4' => 4,
    ],
]);