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，它返回此错误。

count(): Parameter必须是一个数组或实现了Countable

的对象。

有没有人知道我应该为我的update功能或value在我的刀片文件中做什么，这样它就不会删除file元素?

------------------------------------------------------------------------------------------

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');
}

叶片

<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"in form tag

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);
}