php - laravel 5.8 Eloquent : has many relations model

Question

我正在创建事件信息系统并希望在 posts/show.blade.php 中显示标签。

但是我得到一个错误。

Property [name] does not exist on this collection instance

在帖子表中，我有 category_id。 我创建了 post_tag 表。

我需要创建另一个新表吗？

How to show tags in show.blade.php ?

请帮帮我。

post.php

   public function tags() 
{
    return $this->belongsToMany(Tag::class);

}
public function hasTag($tagId)
    {
        return in_array($tagId, $this->tags->pluck('id')->toArray());
    }

标签.php

public function posts()
{
    return $this->belongsToMany(Post::class);
}

类别.php

public function posts()
{
    return $this->hasMany(Post::class);
}

创建帖子表

Schema::create('posts', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('image');
        $table->unsignedBigInteger('category_id');
        $table->string('organizer');
        $table->string('title');
        $table->string('place');
        $table->string('map');
        $table->date('date');
        $table->timestamp('published_at')->nullable();
        $table->text('description');
        $table->timestamps();
    });

创建类别表

Schema::create('categories', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('name');
        $table->timestamps();
    });

创建标签表

Schema::create('tags', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('name');
        $table->timestamps();
    });

post_tag 表

Schema::create('post_tag', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->integer('post_id');
        $table->integer('tag_id');
        $table->timestamps();
    });

ResultsControllere.php

public function show($id,Post $post)
{
    $post= Post::find($id);
    $post->category;
    $post ->tags;
    return view('posts.show',compact('post'));
}

显示.blade.php

Tags:
  <div class="tags">
     {{ $post->tags->name }}
 </div>

Answer 1

根据你定义的关系post有很多标签所以你不能直接访问一对多关系你可能必须循环通过获取标签详细信息，例如名称

<div class="tags">
     @foreach($post->tags as $tag)
     {{ $tag->name }}
     @endforeach
</div>

谢谢。