Laravel LARVAL SAVE 中的关系有

我有一个组的列表，每个组都有一个属性列表，如下所示

//sets
Schema::create('sets', function (Blueprint $table) {
    $table->id();
    $table->string('name');
});

//groups
Schema::create('groups', function (Blueprint $table) {
    $table->id();         
    $table->string('name');
    $table->foreignId('set_id')->constrained('sets')->onDelete('cascade');
});

//attributes
Schema::create('attributes', function (Blueprint $table) {
    $table->id();         
    $table->string('name');
});

//set_group_attributes
Schema::create('set_group_attributes', function (Blueprint $table) {
    $table->foreignId('set_id')->constrained('sets')->onDelete('cascade');
    $table->foreignId('group_id')->constrained('groups')->onDelete('cascade');
    $table->foreignId('attribute_id')->constrained('attributes')->onDelete('cascade');
    $table->integer('position');
    $table->unique(['set_id', 'attribute_id']);
});

我需要保存包含组和属性的集合，这是我的代码:

$set = Set::create(['name' => $request->name]); ---> save the set
$set->groups()->createMany($request->groups); ---> save the group

//set model
public function groups(): HasMany
{
  return $this->hasMany(Group::class, 'set_id','id');
}

我的问题是，如何用LARLAVELEloquent 保存属性？