在 Laravel 中更新“屬於”關系時出現錯誤的表

Question

在這里，我正在嘗試使用存在於類別表中的給定 id 保存文章的類別，我已經設置了關系，但是在嘗試保存時，Laravel 嘗試在文章表中而不是數據透視表中插入新行。 這是錯誤：

  *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)* 

這些是關系和數據透視表

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();
    });

這是我的保存功能

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

你的關系類型是多對多關系，而不是一對多。

你的模型應該是這樣的：

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');
     }
}

如果您想要一對多關系而不需要“article_category”表，您的遷移應該是這樣的：

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();
});

和型號：

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');
     }
}

Answer 2

不確定，但在我看來，關系應該是：

articlass Article extends Model implements SluggableInterface
{ 
   public function category()
   {
     return $this->belongsTo('App\ArticleCategory', 'category_id');
   }
}

和

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

所以它引用了數據透視表