Question

在这里，我尝试使用存在于类别表中的给定ID来保存文章的类别，我设置了关系，但在尝试保存时，Laravel尝试在文章表中插入新行不在数据透视表中。这是错误：

  *Unknown column 'category_id' in 'field list' (SQL: update `articles` set    `category_id` = 1, `updated_at` = 2015-11-16 13:15:32 where `id` = 53)*

这些是关系和支点表

class Article extends Model implements SluggableInterface
{ 
   public function category()
   {
     return $this->belongsTo('App\Category');
   }
}

class Category extends Model implements SluggableInterface
{
     public function articles()
     {
       return $this->hasMany('App\Article','article_category');
     }
}

      //pivot table
    Schema::create('article_category',function(Blueprint $table){
        $table->integer('article_id')->unsigned()->index();
        $table->foreign('article_id')->references('id')->on('articles')->onDelete('cascade');

        $table->integer('category_id')->unsigned()->index();
        $table->foreign('category_id')->references('id')->on('categories')->onDelete('cascade');

        $table->timestamps();
    });

这是我的保存功能

public function store(ArticleRequest $request)
{
    $article=Auth::user()->articles()->create($request ->all());
    $category =Category::find($request ->input('category'));
    $article->category()->associate($category)->save();
}

Answer 1

您的关系类型是多对多的关系，而不是一对多。

你的模特应该是这样的：

Schema::create('articles',function(Blueprint $table){
    $table->integer('id')->increments();
    $table->string('title');
    $table->text('content');

    $table->integer('category_id')->unsigned()->index();
    $table->foreign('category_id')->references('id')->on('categories')->onDelete('cascade');

    $table->timestamps();
});

如果你想要一对多关系不需要＆＃39; article_category＆＃39;表格您的迁移应该是这样的：

class Article extends Model implements SluggableInterface
{ 
   public function category()
   {
     return $this->belongsTo('App\Category');
   }
}

class Category extends Model implements SluggableInterface
{
     public function articles()
     {
       return $this->hasMany('App\Article');
     }
}

和模特：

Private Function foo(ByVal text As String)
    Return text
End Function


Private Function foo2(ByVal text As String) As String
    Return text
End Function

Answer 2

不确定，但我认为关系应该是：

class Category extends Model implements SluggableInterface
{
     public function articles()
     {
        return $this->hasMany('App\ArticleCategory','article_id');
     }
}

和

class Article extends Model implements SluggableInterface
{ 
   public function categories()
   {
     return $this->belongsToMany('App\Category', 'article_category');
   }
}

class Category extends Model implements SluggableInterface
{
     public function articles()
     {
       return $this->belongsToMany('App\Article', 'article_category');
     }
}

所以它引用了数据透视表

更新时错误的表格＆＃34;属于＆＃34; Laravel的关系

2 个答案: