如何更新Laravel关系的表

Question

有2种型号：

Product和Product_Images

class Product extends Eloquent { 
    protected $guarded = []; 
    public $timestamps = true; 

    public function images(){ 
     return $this->hasMany('product_image'); 
    } 

    public function brand(){ 
     return $this->belongsTo('brand'); 
    } 
} 

class Product_Image extends Eloquent { 
    protected $table = 'product_images'; 
    protected $guarded = []; 

    public function images(){ 
     return $this->hasMany('product_image'); 
    } 
} 

我可以做的更新或插入数据，这款车型

$product = new Product; 
$product->title = $data['title']; 
$product->alias = $data['alias']; 
$product->short_description = $data['short_description']; 
$product->price = $data['price']; 
$product->brand_id = $data['brand_id']; 
$product->description = $data['description']; 
$product->published = 1; 
$product->save(); 
foreach($data['images'] as $k => $v){ 
    if($data['main'] == $k){ 
     $product->images()->save(
      new Product_Image(['image' => $v,'main' => 1]) 
     ); 
    }else{ 
     $product->images()->save(
      new Product_Image(['image' => $v,'main' => 0]) 
     ); 
    } 
} 

但是当用户尝试编辑产品，用户可能会删除现有图像并尝试添加新图像并发送表单。我应该遵循哪种方式来更新图像关系。我应该删除与产品相关的所有图像并创建新图像吗？这对我来说看起来很不好，对此有没有最好的？

Answer 1

所有的关系首先是错误的，我认为你有一个与产品和形象

一对多的关系所以这应该是

public function images(){ 
    return $this->hasMany('product_image'); 
} 

public function product() 
{ 
    return $this->belongsTo(Product::class);//import your product class with use 
} 

你也被错误定义你的关系。在你的关系，你会在某些情况下选择定义的类，你可以通过外键和地方重点和表名看Defining Relationships

这应该是

public function images(){ 
    return $this->hasMany('product_image'); 
} 
public function brand(){ 
    return $this->belongsTo('brand'); 
} 

这

public function images(){ 
    return $this->hasMany(Product_Image::class);//import class 
} 
public function brand(){ 
    return $this->belongsTo(Brand::class);//import Brand class 
} 

你也可以简化您的代码

 if($data['main'] == $k){ 
      $product->images()->save(
       new Product_Image(['image' => $v,'main' => 1]) 
      ); 
     }else{ 
      $product->images()->save(
       new Product_Image(['image' => $v,'main' => 0]) 
      ); 
     } 


     $product->images()->save(
      new Product_Image(['image' => $v,'main' => (int)($data['main'] == $k)]) 
     );