试图从数据透视表中取回数值

我有这个博客应用程序，和帖子有标签。我做了多对多的关系，它可以很好地存储，但编辑时无法取回它的值。

让我们来看看一些代码：邮政型号

<?php 

namespace App; 

use Illuminate\Database\Eloquent\Model; 

class Post extends Model 
{ 
    public function category() 
    { 
    return $this->belongsTo('App\Category'); 
    } 
    public function tags() 
    { 
    return $this->belongsToMany('App\Tag'); 
    } 
    public function comments() 
    { 
    return $this->hasMany('App\Comment'); 
    } 
    public function marca() 
    { 
    return $this->belongsToMany('App\Marca'); 
    } 
    public function modelo() 
    { 
    return $this->belongsToMany('App\Modelo'); 
    } 
    public function versao() 
    { 
    return $this->belongsToMany('App\Versao'); 
    } 
}

的PostController中@Create：

$post = new Post; 
     $post->title = $request->title; 
     $post->slug = $request->slug; 

     $post->category_id = $request->category_id; 
     $post->body = $request->body; 

     if ($request->hasFile('featured_image')){ 
      $image = $request->file('featured_image'); 
      $filename = time() . '.' . $image->getClientOriginalExtension(); 
      $location = public_path('images/' . $filename); 
      Image::make($image)->save($location); 
      $post->image = $filename; 

     } 

     $post->save(); 

     $post->tags()->sync($request->tags, false);

而且PostController中@编辑：

public function edit($id) 
{ 
    $post  = Post::find($id); 
    $categories = Category::all(); 
    $tags = Tag::all(); 
    $tags2 = array(); 
    foreach ($tags as $tag) { 
     $tags2[$tag->id] = $tag->name; 
    } 
    $marcas  = Marca::all(); 
    $modelos = Modelo::all(); 
    $versaos = Versao::all(); 
    return view('manage.posts.edit')->withPost($post)->withCategories($categories)->withMarcas($marcas)->withTags($tags2)->withModelos($modelos)->withVersaos($versaos); 
}

最后，但并非最不重要，HTML：

<label for="cambio">TAG</label> 
        <select class="custom-select select-multi" name="tags[]" multiple="multiple"> 
         <option value="{{ $tags->id }}">{{ $tags->name }}</option> 
        </select> 
        <br> 
        <br>

的错误是：

(2/2) ErrorException 
Trying to get property of non-object (View: /Users/marcellopato/Sites/CepCar2.0-BootStrap3.3/resources/views/manage/posts/edit.blade.php)

任何人，好吗？

来源

2017-08-29 Marcello Patto

你好，你尝试循环标签？ – Maraboc

不是。我曾经使用Form-Helpers做过这件事，但是因为有点陈旧... –

试试我的答案！ – Maraboc

试试这个版本：

public function edit($id) 
{ 
    $post  = Post::with('tags')->find($id); 
    $categories = Category::all(); 
    $tags = Tag::all(); 
    $marcas  = Marca::all(); 
    $modelos = Modelo::all(); 
    $versaos = Versao::all(); 
    return view('manage.posts.edit')->withPost($post)->withCategories($categories)->withMarcas($marcas)->withModelos($modelos)->withVersaos($versaos); 
}

在视图：

<label for="cambio">TAG</label> 
<select class="custom-select select-multi" name="tags[]" multiple="multiple"> 
    @foreach ($post->tags as $tag) 
      <option value="{{ $tag->id }}">{{ $tag->name }}</option> 
    @endforeach 
</select> 
<br> 
<br>

来源

2017-08-29 20:13:17 Maraboc

尝试我的更新！ – Maraboc

感谢@jacurtis和他的课Vuejs.js的，我找到了一种方法来解决我的问题。

一些脚本：

var app = new Vue({ 
    el: '#app', 
    data : { 
     ... 
     coresSelected : {!! $versao->cores->pluck('id') !!}, 
     ... 
}

在HTML部分：

<label>Cores Existentes</label><br> 
       <select class="custom-select select-multi but-to-but" multiple="multiple" name="cor[]" v-model="coresSelected"> 
        @foreach($cores as $cor) 
        <option :value="{{ $cor->id }}">{{ $cor->descricao }}</option> 
        @endforeach 
       </select>

，其结果是：

Those are colors added on create section of my CorController

感谢大家！

来源

2017-08-31 21:51:03

试图从数据透视表中取回数值

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