在yii2文件上传的非对象上调用成员函数savea() - Call to a member function saveAs() on a non-object in yii2 file upload

Call to a member function saveAs() on a non-object in yii2 file upload

我使用kartik fileUpload扩展名在yii2中上传文件，一旦我选择一个文件并提交，我就得到

在非对象上调用成员函数savea ()

我已经查看了其他关于这个问题的帖子，但没有帮助，

My View code..

 <?php  echo $form->field($documents, 'sars_certificate')->label(false)->
  widget(FileInput::classname(), [
    'pluginOptions' => [
        'showCaption' => true,'showRemove' => true,'showClose' => true,
        'showPreview' => true,'uploadAsync' => true,
        'showUpload' => false,'maxFileSize'=> 2000,'autoReplace'=> true, 
        'placeholder' => 'Select a File...',],]); ?>

My model code..

 [['sars_certificate'], 'file', 'skipOnEmpty' => false, 'extensions' => 'png, jpg,pdf,jpeg']

和My controller code..

  public function actionCreate()
  {   
  $model = new Projects(); 
  $documents = new ProjectDocuments();    
$borrower_id = Yii::$app->user->identity->id;
  $code = $model->accessCode(10);
  if ($model->load(Yii::$app->request->post())) 
  {
   //All $model related things will bw done
  //In this im doing file upload
  $documents->borrower_id = $borrower_id; 
  $documents->project_id = $code;    
  $documents->save(false);  
  $documents->sars_certificate = UploadedFile::getInstances($documents,'sars_certificate');
  $documents->sars_certificate->saveAs('user/purchase_order/' . $documents->sars_certificate->baseName . '.' . $documents->sars_certificate->extension);
  $documents->sars_certificate = $documents->sars_certificate;
  $documents->save(false); 
         return $this->redirect(['index']);
    }

我给出了if($documents->validate()){ **** }。但它本身不符合条件，所以我把它去掉了。现在它说上面的错误…

请大家帮帮我，我在这上面浪费了很多时间。

1)为避免重复图像，请在图像名称中添加time()

2) 删除$documents->save(false); UploadInstance。

public function actionCreate() {
  $model = new Projects();
  $documents = new ProjectDocuments();
  $borrower_id = Yii::$app->user->identity->id;
  $code = $model->accessCode(10);
  if ($model->load(Yii::$app->request->post())) {
    //All $model related things will bw done
    //In this im doing file upload
    $documents->borrower_id = $borrower_id;
    $documents->project_id = $code;

    if(UploadedFile::getInstance($documents, 'sars_certificate')){
      $image = UploadedFile::getInstance($documents, 'sars_certificate'); 
      $imageName = time().$image->name;
      $path = "user/purchase_order/".$imageName; 
      if($image->saveAs($path)){
       $documents->sars_certificate = $imageName;
      }
    }
    $documents->save(false);
    return $this->redirect(['index']);
  }
}

public function actionCreate() {
  $model = new Projects();
  $documents = new ProjectDocuments();
  $borrower_id = Yii::$app->user->identity->id;
  $code = $model->accessCode(10);
  if ($model->load(Yii::$app->request->post())) {
    //All $model related things will bw done
    //In this im doing file upload
    $documents->borrower_id = $borrower_id;
    $documents->project_id = $code;

    if(UploadedFile::getInstance($documents, 'sars_certificate')){
      $image = UploadedFile::getInstance($documents, 'sars_certificate');
      if($image){
        $imageName = time().$image->name;
        $path = "user/purchase_order/".$imageName; 
        if($image->saveAs($path)){
         $documents->sars_certificate = $imageName;
        }
      }
    }
    $documents->save(false);
    return $this->redirect(['index']);
  }
}