php - 使用 product_id 上传的 Laravel dropzone 问题

Question

假设我有一个产品，它有很多图片。我使用了 Dropzone js，如果我上传图片那么它很好但是如果想用 product_id 存储然后它传递空值。没有传递任何值(value)它的工作正常。那么我怎样才能同时存储图像名称和 product_id 呢？这是我的 Controller :

 public function store(Request $request)
    {
        if ($request->hasFile('file')){

            $file= $request->file;
            $fileName = $file->getClientOriginalName();
            $fileName =  time() .'-'.$fileName;
            $productImage = public_path("uploads/products/{$fileName}"); // get previous image from folder
            if (File::exists($productImage)) { // unlink or remove previous image from folder
                unlink($productImage);
            }
            $file->move('public/uploads/products/',$fileName);
            $image  = new Image();
            $image->image = $fileName;
            $image->product_id = $request->product_id;
            $image->save();

//            return redirect()->route('product.index');

        }
}

数据库架构:

 Schema::create('images', function (Blueprint $table) {
            $table->increments('id');
            $table->string('image');
            $table->integer('product_id')->unsigned()->nullable();
            $table->foreign('product_id')->references('id')->on('products')->onUpdate('cascade')->onDelete('cascade');
            $table->timestamps();
        });

错误:

message: "SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (eshop.images, CONSTRAINT images_product_id_foreign FOREIGN KEY (product_id) REFERENCES products (id) ON DELETE CASCADE ON UPDATE CASCADE) (SQL: insert into images (image, product_id, updated_at, created_at) values (1538483231-blog-1-3.png, 123, 2018-10-02 12:27:11, 2018-10-02 12:27:11))"

Answer 1

Mysql 给出“无法添加或更新子行:外键约束失败”，因为您在 123 id 的产品表中没有任何产品。首先，您需要创建该产品。之后你可以为它创建关系记录