关于php：Laravel SQLSTATE [42S22]：找不到列：1054″字段列表”中的未知列” 0″(SQL：插入到” add_file”(” 0″)中)

Laravel SQLSTATE[42S22]: Column not found: 1054 Unknown column '0' in 'field list' (SQL: insert into `add_file` (`0`)

我需要向Laravel中的数据库提交一个包含多个文件的表单，每次我填写表单时都会出现此错误

SQLSTATE[42S22]: Column not found: 1054 Unknown column '0' in 'field list' (SQL: insert into add_file (0) values ({"name":"Opeyemi Adam","description":"Thanks bro","attach":[["CRITICAL TECHNICAL OBSERVATIONS.doc"]]}))

下面是模型

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class AddFile extends Model{
protected $table = 'add_file';
protected $fillable = ['name', 'description', 'attach'];
}

控制器

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public function submitform(AddFileFormRequest $request){
$destinationPath = storage_path('app/attachments/');
$attach_file = array();

$file = $request->file('attach');
if (!empty($file[0])){
foreach($file as $key){
$filename = $key->getClientOriginalName();

$key->move($destinationPath, $filename);

$attach_file[] = array($filename);
}

}

$form_content = new AddFile(array(
'name' => $request->get('name'),
'description' => $request->get('description'),
'attach' => $attach_file
));

var_dump($form_content);
DB::table('add_file')->insert(array($form_content));

}

不知道字段列表来自何处