Php Laravel 5调用未定义的方法Illumb\Database\Eloquent\Collection::attach()
我正在使用具有多对多关系的laravel 5。 下面是我的代码 Article.phpPhp Laravel 5调用未定义的方法Illumb\Database\Eloquent\Collection::attach(),php,mysql,laravel,laravel-5,Php,Mysql,Laravel,Laravel 5,我正在使用具有多对多关系的laravel 5。 下面是我的代码 Article.php namespace App; use Illuminate\Database\Eloquent\Model; use Carbon\Carbon; class Article extends Model { protected $fillable = ['title', 'body', 'published_at', 'user_id']; protected $dates = ['published
namespace App;
use Illuminate\Database\Eloquent\Model;
use Carbon\Carbon;
class Article extends Model {
protected $fillable = ['title', 'body', 'published_at', 'user_id'];
protected $dates = ['published_at'];
public function setPublishedArAttribute($date)
{
Carbon::createFromFormat('Y-m-d', $date);
$this->attributes['published_at'] = Carbon::parse($date);
}
public function scopePublished($query)
{
$query->where('published_at', '<=', Carbon::now());
}
public function scopeUnpublished($query)
{
$query->where('published_at', '>', Carbon::now());
}
public function user()
{
return $this->belongsTo('App\User');
}
public function tags()
{
return $this->belongsToMany('App\Tag');
}
}
ArticleController.php
namespace App\Http\Controllers;
use App\Article;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Request;
use Carbon\Carbon;
use Auth;
class ArticlesController extends Controller {
public function __construct()
{
$this->middleware('auth', ['except', 'index']);
}
public function index()
{
$articles = Article::latest('published_at')->published()->get();
return view('articles.index', compact('articles'));
}
public function show(Article $article)
{
return view('articles.show', compact('article'));
}
public function create()
{
if(Auth::guest()){
return redirect('articles');
}
$tags = \App\Tag::lists('name', 'id');
return view('articles.create', compact('tags'));
}
public function store(Requests\ArticleRequest $request)
{
$article = Auth::user()->articles()->create($request->all());
$article->tags->attach($request->input('tags'));
\Session::flash('flash_message', 'Your article has been created!');
Article::create($request->all());
return redirect('articles');
}
public function edit(Article $article)
{
return view('articles.edit', compact('article'));
}
public function update(Article $article, Requests\ArticleRequest $request)
{
$article->update($request->all());
return redirect('articles');
}
}
当我尝试创建文章并使用ArticleController中的store函数将其存储在数据库中时,我得到以下错误
ArticlesController.php行中的FatalErrorException:调用未定义的方法Illumb\Database\Eloquent\Collection::attach()
我已经设置了文章和标签之间的多对多关系,还适当地添加了迁移
但当我尝试使用标记添加文章时,我得到了一个错误。
让我知道我的代码有什么问题。设置关系时缺少任何内容
这也是迁移表文件
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateTagsTable extends Migration {
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('tags', function(Blueprint $table)
{
$table->increments('id');
$table->string('name');
$table->timestamps();
});
Schema::create('article_tag', function(Blueprint $table){
$table->increments('id');
$table->integer('article_id')->unsigned()->index();
$table->foreign('article_id')->references('id')->on('articles')->onDelete('cascade');
$table->integer('tag_id')->unsigned()->index();
$table->foreign('tag_id')->references('id')->on('tags')->onDelete('cascade');
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::drop('tags');
Schema::drop('article_tag');
}
}
让我知道如何使attach与多对多关系一起工作使用关系属性(
$article->tags
)将返回与文章相关的所有标记的集合。此集合
没有attach()
方法
$article->tags()->attach($request->input('tags'));
您需要使用关系方法($article->tags()
)。relationship方法返回relationship实例,该实例具有attach()
方法
$article->tags()->attach($request->input('tags'));
您需要调用
$article->tags()
方法,而不是$article->tags
属性
在Laravel中,以属性名的形式调用关系方法,神奇地将相关模型作为集合获取。换句话说,这两行在Laravel中的意思完全相同:
$tags = $article->tags;
以及:
另一方面,调用relationship方法返回一个关系实例,在您的例子中-belongToMany
attach()
方法是belongTomany
类的一部分
$tags = $article->tags()->get();