Laravel模型关系

Question

I cannot connect to model function in laravel 5.6

     <img src="{{$item->file_id ? $item->photo->file_url() : 
    "http://www.ecmsnews.com/wp-content/themes/nucleare-pro/images/no-image-box.png"}}"  
     width="200" height="100">

here I call $item file_id to find the image

public function photo(){
       return $this->belongsTo('App\Models\CRM_STAFF\Staff_files', 'file_id');
  }

that I have in model to connect to other model to use this function

 public function file_url(){
        return ($this->_domain).($this->id);
}

but i get error like that enter image description here

Answer 1

add with('photo') in the model to load the relation. then check if $item->photo is not null

$item = Item::with('photo')->where(...)->get();
return view('yourview', compact('item'));

then in the view

<img src="{{!is_null($item->photo) ? $item->photo->file_url() : "http://www.ecmsnews.com/wp-content/themes/nucleare-pro/images/no-image-box.png"}}" width="200" height="100">

Answer 2

谢谢所有想帮助我的人，我找到了答案。问题是我用Json_encode保存了所有文件，我只需要对其解码即可。