$lesson['l_title']=$request['l_title'];
$lesson['l_introduce']=$request['l_introduce'];
$lesson['l_preview']=$request['l_preview'];
$lesson['l_is_commend']=$request['l_is_commend'];
$lesson['l_is_hot']=$request['l_is_hot'];
$lesson['l_click']=$request['l_click'];
$lesson->save();
//dd($lesson['l_id']);
dd($lesson->toArray());结果
array:9 [▼"l_title" => "aa""l_introduce" => "aa""l_preview" => "/images/nopic.jpg""l_is_commend" => "0""l_is_hot" => "0""l_click" => "0""updated_at" => "2019-09-28 14:04:26""created_at" => "2019-09-28 14:04:26""l_id" => 21
]

批量赋值
你也可以使用 create 方法来保存新模型， 方法会返回模型实例。不过，在使用之前，你需要先在模型上指定 fillable 或 guarded 属性，因为所有的 Eloquent 模型在默认情况下都不能进行批量赋值。当我们设置好批量赋值的属性，就可以通过 create 方法插入新数据。 create 方法将返回已保存的模型实例：
$flight = App\Flight::create(['name' => 'Flight 10']);

DB::transaction(function () use ($request,$lesson) {//dd($request->toArray());$lesson['l_title']=$request['l_title'];$lesson['l_introduce']=$request['l_introduce'];$lesson['l_preview']=$request['l_preview'];$lesson['l_is_commend']=$request['l_is_commend'];$lesson['l_is_hot']=$request['l_is_hot'];$lesson['l_click']=$request['l_click'];$lesson->save();//dd($lesson['l_id']);//dd($lesson->toArray());//2、插入标签课程数据--关系表$tags=$request['tags'];foreach ($tags as $tag){$tag_lesson=[];$tag_lesson['tl_t_id']=$tag;//$tag_lesson['tl_l_id']=$lesson['l_id'];//TagAndLesson::create($tag_lesson);//dd($tag_lesson);$lesson->hasManyLessonTags()->create($tag_lesson);}//videos数据过来的时候是json数据,true表示转成数组而非对象$videos=json_decode($request['videos'],true);//dd($videos);foreach ($videos as $video){unset($video['v_id']);$lesson->videos()->create($video);
//            $lesson->videos()->create([
//                'title'=>$video['title'],
//                'path'=>$video['path'],
//            ]);
      }});

array:6 [▼"nowControllerAction" => "LessonController.index""_token" => "NMEDJcOEzZecOtscrKhgaxRtuXbprWGFxGcRz5JP""_previous" => array:1 [▼"url" => "http://legend3.com/admin/lesson"]"_flash" => array:2 [▼"old" => []"new" => []]"login_admin_59ba36addc2b2f9401580f014c7f58ea4e30989d" => 1"PHPDEBUGBAR_STACK_DATA" => []
]

//视频属于课程
public function lesson(){return $this->belongsTo('App\Model\Lesson', 'v_l_id','l_id');
}