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根据laravel中的相同类别制作'Related To'部分

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4

我有一个网站，我发布食谱 . 他们每个人都有一个类别，我想再显示2-3个与该帖子相同类别的帖子 . 我如何构建一个查询来显示它？我有一个Post Model和Category模型，它们之间有一个belongsToMany关系，它填充了一个数据透视表，我将这些类别绑定到一个帖子 .

这是我的BController中的函数，这是将数据传递给用户可以访问和查看的视图的函数 .

public function slug(Request $request, $slug)

    {
        if (Auth::check()) {
          $fav = DB::table('post_user')->whereUserId(Auth::id())->pluck('post_id')->all();
        }
         /*get search query from slug page*/
        $query=$request->get('q');
        /*display the results of the search*/
        if ($query) {
            $posts = $query ? Post::search($query)
            ->orderBy('id','desc')
            ->paginate(7) : Post::all();
            return view('home', compact('posts','fav'));
        }
       /*the $url veriable is for share buttons*/
           else {
            $url = $request->url();
            $post = Post::where('slug', '=', $slug)->first();
            return view('b.s', compact('post','url'));

        }
    }

this is my Post model:

public function categories(){
    return $this->belongsToMany('App\Category');
}

this is in Category model:

public function posts(){
    return $this->belongsToMany('App\Post');
}

The pivot table is like so:

$table->increments('id');
            $table->integer('post_id')->unsigned();

            $table->foreign('post_id')->references('id')
            ->on('posts')->onDelete('cascade');

            $table->integer('category_id')->unsigned()->nullable();
            $table->foreign('category_id')->references('id')
            ->on('categories')->onDelete('cascade');
php mysql laravel laravel-5.3

2 回答

  • 4

    您可以使用 whereHas 在相关表上添加约束，如下所示：

    // get the post usnig slug
$post = Post::where('slug', '=', $slug)->first();

// get the related categories id of the $post
$related_category_ids = $post->categories()->pluck('categories.id');

// get the related post of the categories $related_category_ids
$related_posts = Post::whereHas('categories', function ($q) use($related_category_ids) {
        $q->whereIn('category_id', $related_category_ids)
    })
    ->where('id', '<>', $post->id)
    ->take(3)
    ->get();

    Update

    将 $related_posts 传递给您的视图并将其用作：

    @foreach ($related_posts as $related_post)
    <li>{{ related_post->title }}</li>
@endforeach
    回复于
  • 1

    可能的解决方案是包含一段代码以获得所需的类别 .

    如果我正确理解您的模型，您可以有几个类别 . 所以，我们需要收集你帖子的所有类别，并且只保留id;我们必须排除当前对象的帖子ID :)

    $post = Post::where('slug', '=', $slug)->first();

// get Category IDs. There are others ways to do it.
$categoriesId = [];
foreach( $post->categories as $category ) {
  $categoriesId[] = $cateogyr->id;
}

// get similar posts
$others = Post::
     whereIn('categories', $categoriesId)
   ->where('id', '!=', $post->id)
   ->take(3)
   ->get();

    在您的情况下，您有一个数据透视表：

    $others = Post::
   with(array('YourPivot' => function($query) use($categoriesId)
     {
       whereIn('categories', $categoriesId)
     })
   ->where('id', '!=', $post->id)
   ->take(3)
   ->get();
    回复于

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