laravel按标签

时间:2018-05-14 01:29:43

标签: php laravel tags laravel-query-builder

我希望通过标签获取当前帖子的相关帖子,但老实说我无法得到它。

我会告诉你我的桌子结构。

帖子表:

public function up()
{
    Schema::create('posts', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('user_id')->unsigned();
        $table->string('title');
        $table->string('slug')->unique();
        $table->text('body');
        $table->text('excerpt')->nullable();
        $table->string('stickers')->nullable();
        $table->integer('category_id')->nullable()->unsigned();
        $table->text('meta_description')->nullable();
        $table->text('meta_keywords')->nullable();
        $table->string('postimg')->nullable();
        $table->string('type')->nullable()->default('common');
        $table->boolean('published')->default(false);
        $table->softDeletes();
        $table->timestamps();
    });
}

标签表:

public function up()
{
    Schema::create('tags', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name')->unique();
        $table->string('slug')->unique();
        $table->softDeletes();
        $table->timestamps();
    });
}

我有一个数据透视表来处理帖子和帖子上带有这些标签的标签。

post_tag表:

public function up()
{
    Schema::create('post_tag', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('post_id')->unsigned();
        $table->foreign('post_id')->references('id')->on('posts')->onDelete('cascade');

        $table->integer('tag_id')->unsigned();
        $table->foreign('tag_id')->references('id')->on('tags')->onDelete('cascade');
    });
}

一切都很好,一个标签有很多帖子,一个帖子有很多标签,是多对多的关系。

发布模型:

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

标签型号:

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

我可以在帖子上显示所有标签,但我想通过标签显示相关帖子,当我说相关帖子时,我的意思是访客正在阅读的“当前帖子”。让我们说这个当前帖子有微软,谷歌,苹果,汽车标签,我想要相关的帖子到这些标签。我不知道这是否可能或者更容易按类别进行。

新闻控制器逻辑:

这里是我对帖子视图的所有逻辑。

public function getSingle($slug, $id = null)
{
    $post = Post::where('slug', '=', $slug)->first();
    $topcat = Category::orderBy('created_at', 'desc')->limit(5)->get();
    $comment = Comment::find($id);

    $tags = Tag::all();
    $tags2 = array();
    foreach ($tags as $tag) {
        $tags2[$tag->id] = $tag->name;
    }

    // Previous and Next Post
    $previous = Post::where('id', '<', $post->id)->orderBy('id', 'desc')->first();
    $next = Post::where('id', '>', $post->id)->orderBy('id', 'asc')->first();

    // Related Posts Here!

    $tags3 = array();
    foreach ($post->tags as $tag) {
        $tags3[$tag->id] = $tag->name;
    }
    $related = Post::whereHas('tags', function ($query) use ($tags3) {
        $query->where('name', $tags3);
    })->get();
    // dd($related);

    return view('news.single')
            ->withPost($post)
            ->withTopcat($topcat)
            ->withTags($tags2)
            ->withComment($comment)
            ->withPrevious($previous)
            ->withNext($next)
            ->withRelated($related);
}

我做了$tags3变量来测试它,但我得不到我想要的。

提前致谢

1 个答案:

答案 0 :(得分:3)

这应该有效:

std::set<T, C>

$post = Post::where('slug', '=', $slug)->first(); $related = Post::whereHas('tags', function ($q) use ($post) { return $q->whereIn('name', $post->tags->pluck('name')); }) ->where('id', '!=', $post->id) // So you won't fetch same post ->get(); 行创建一个包含所有标记名称的数组(属于帖子)。