如何在 Laravel 5 中更新一对多 (hasMany) 关系
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How to UPDATE one to many (hasMany) relation in Laravel 5
提问by sanjay ojha
Well, I am using Laravel 5.4 and reached in a situation where I need to update one to many (hasMany) relation ship.
I have a productstable and a product_imagestable. Below is my relation definition in each model.
好吧，我正在使用 Laravel 5.4，并且遇到了需要更新一对多 (hasMany) 关系的情况。我有一张products桌子和一张product_images桌子。以下是我在每个模型中的关系定义。
//Product.php
public function productImages()
{
return $this->hasMany('App\ProductImage');
}
//ProductImage.php
public function product()
{
return $this->belongsTo('App\Product');
}
I am giving a form interface to update existing product. In that I have 4 optional file upload input html tag for updating or adding (new) images for the product. Remember all these 4 image upload is optional.
我正在提供一个表单界面来更新现有产品。因为我有 4 个可选的文件上传输入 html 标签，用于更新或添加产品的（新）图像。请记住所有这 4 个图像上传都是可选的。
So my question is what is the best approach(laravel way) to
所以我的问题是什么是最好的方法（laravel 方法）
- update existing entries in
product_imagestable - add new one if provided
- delete existing if it is removed
- 更新现有条目
product_images表 - 如果提供，请添加新的
- 如果删除，则删除现有
I know the attachor detachmethod (sync) to remove all and then add the provided one. But I want to maintain the id if we are replacing any existing image.
我知道attachordetach方法 ( sync) 删除所有，然后添加提供的一个。但是如果我们要替换任何现有图像，我想保留 id。
回答by Chad Kieffer
Old question, but here's an answer.
老问题，但这里有一个答案。
1 and 2- Laravel's updateOrCreate() method will update existing records and insert new records if an existing image ID is not provided. See "updateOrCreate" under Eloquent ORM's Update documentation.
1 和 2- 如果未提供现有图像 ID，Laravel 的 updateOrCreate() 方法将更新现有记录并插入新记录。请参阅 Eloquent ORM 的更新文档下的“updateOrCreate” 。
$images = App\ProductImage::updateOrCreate(
['id' => $id],
['field1' => $field1, 'field2' => $field2]
);
3- To delete, add a delete checkbox to your form which passes target image IDs as an array...
3- 要删除，请在表单中添加一个删除复选框，该复选框将目标图像 ID 作为数组传递...
<input type="checkbox" name="imgsToDelete[]" value="{{$product->image->id}}">
<label>Delete</label>
...then, in your product update method, simply pass the field array to Eloquent's destroy() method.
...然后，在您的产品更新方法中，只需将字段数组传递给 Eloquent 的 destroy() 方法。
$imgsToDelete = $request->get('imgsToDelete');
ProductImage::destroy($imgsToDelete);
Don't forget to delete stored images from the file system!
不要忘记从文件系统中删除存储的图像！
