Laravel：更新数组中的多个文件

Question

我能够将数组中的多个文件存储并保存到数据库中，以及更新表单数据。但是，现在的问题是，当我更新表单而不更新file 时，它会返回此错误。

count()：参数必须是数组或者实现了Countable的对象

有谁知道我应该为我的刀片文件中的update 函数或value 做些什么，这样它就不会删除file 元素？

---------------------------------------------- 已更新 -------------------------------------------- -

public function update(Request $request, $id)
{        
    $data = $request->all();
    $data = $this->saveEmptyData($data);

    $c = Document::find($id);
    $fileData = [];

    if(count($request->file)>0)
    {
        foreach($request->file as $file)
        {    
            $path = public_path('storage/documents');
            $fileName = time().'_'.$file->getClientOriginalName();
            $file->move($path, $fileName);

            if ($c->file)
            {
                File::delete($path.'/'.json_decode($c->file)[0]);
            }
            $fileData[] = $fileName;
        }
        $doc = json_encode($fileData);
        $c->file = $doc;
        
        $c->name = $request->name;
        $c->price = $request->price;
        $c->publish = $request->publish;
    } 
    //else {
    //    redirect()->back()->with('errors', 'File is required!');
    //}
    $c->save();

    return redirect()->route('product.index')->with('success', 'Document updated successfully');
}

刀片

<form method="POST" action="{{ route('document.update', $doc) }}" enctype="multipart/form-data">
    <fieldset>
        ....
        <div class="form-group">
            <label>Document</label>
            <div class="input-group-append">
                <label for="upload_file">Upload</label>
                <input id="upload_file" type="file" name="file[]" value="{{ isset($doc) ? $doc['file'] : '' }}" multiple>
            </div>
        </div>
    </fieldset>
</form>

Answer 1

 if(count($request->file)>0)
 {
   foreach($request->file as $file)
   { 
      $path = public_path('documents/');
      $fileName = time().'_'.$file->getClientOriginalName();
      $file->move($path, $fileName);

      if ($c->file)
      {
         File::delete($path.'/'.json_decode($c->file)[0]);
      }

      $fileData[] = $fileName;
   }
   $doc= json_encode($fileData); //replace $doc['file'] with $doc
   $c->file=$doc;
 }

$c->save();
//not required to declare $fileData ;

Answer 2

enctype="multipart/form-data" 在表单标签中

if(count($request->file)>0)
{
    foreach($request->file as $file)
    { 
        $path = public_path('documents/');
        $fileName = time().'_'.$file->getClientOriginalName();
        $file->move($path, $fileName);

        if ($c->file)
        {
            File::delete($path.'/'.json_decode($c->file)[0]);
        }

        $fileData[] = $fileName;
    }
    $doc['file'] = json_encode($fileData);
}