調用成員函數saveAs（）null（不工作skipOnEmpty）

Question

我無法更新頁面沒有上傳image.Even如果我寫skipOnEmpty在規則中不起作用。我錯了什麼？

這是一個控制器

if ($model->load(Yii::$app->request->post())){ 
     //represent the uploaded file as an instance 
     $model->imageFile = UploadedFile::getInstance($model, 'imageFile'); 

     //save path to image in db 
     $model->image = '/images/' . $model->imageFile->baseName . '.' . $model->imageFile->extension; 
     //save changes in db 
     $model->save(); 
     //upload image on server 
     $model->upload(); 
Yii::$app->session->setFlash('success', 
       "Product is successfully updated!"); 
     return $this->redirect(['view', 'id' => $model->id]); 
    } else { 
     return $this->render('update', [ 

      'model' => $model, 
     ]); 
    } 
} 

這是一個模型

public function rules() 
{ 
    return [ 
     [['name', 'category', 'code', 'price', 'availability', 'brand', 'description'], 'required'], 
     [['category', 'code', 'availability', 'is_new', 'is_recommended', 'status'], 'integer'], 
     [['price'], 'number'], 
     [['description'], 'string'], 
     [['name','image', 'brand'], 'string', 'max' => 255], 
     [['imageFile'], 'file', 'skipOnEmpty' => true, 'extensions' => 'png, jpg'], 
    ]; 
} 

上傳文件到服務器像下面

public function upload() 
{ 
    if ($this->validate()) { 
     $this->imageFile->saveAs('images/' . $this->imageFile->baseName . '.' . $this->imageFile->extension); 
     return true; 
    } else { 
     return false; 
    } 
} 

Answer 1

變化控制器代碼：

if ($model->load(Yii::$app->request->post())){ 
     //represent the uploaded file as an instance 
     $model->imageFile = UploadedFile::getInstance($model, 'imageFile'); 

     //save path to image in db 
     if($model->imageFile){ 
     $model->image = '/images/' . $model->imageFile->baseName . '.' . $model->imageFile->extension; 
     } 
     //save changes in db 
     $model->save(); 
     //upload image on server 
     if($model->imageFile){ 
       $model->upload(); 
      } 
Yii::$app->session->setFlash('success', 
       "Product is successfully updated!"); 
     return $this->redirect(['view', 'id' => $model->id]); 
    } else { 
     return $this->render('update', [ 

      'model' => $model, 
     ]); 
    } 
} 

設置的隱藏字段中上傳的形式象下面這樣：

<?php $form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]); ?> 


    <?= $form->field($model, 'imageFile')->fileInput() ?> 
    <?if(!$model->isNewRecord): 
      echo Html::activeHiddenInput($model, 'imageFile'); 
     endif; 
    ?>