How to upload and update images in Yii?

Question

Yii

Hello! Can you please tell me how to save images in Yii2? Declared an additional $file variable and added loading code to the model after saving. There is data in the debugger, but it is not loaded into the root and database ...
Loading code

public function beforeSave($insert)
    {
        if ($file = UploadedFile::getInstance($this, 'file')){
            $dir = Yii::getAlias('@images').'/trener/';
            if (file_exists($dir.$this->img)){
                unlink($dir.$this->img);
            }
            if (file_exists($dir.'50x50/'.$this->img)){
                unlink($dir.'50x50/'.$this->img);
            }
            if (file_exists($dir.'/800x/'.$this->img)){
                unlink($dir.'800x/'.$this->img);
            }
            $this->img = strtotime('now').Yii::$app->getSecurity()->generateRandomString(6) . '.' .$file->extension;
            $file->saveAs($dir.$this->img);

        }
        return parent::beforeSave($insert); // TODO: Change the autogenerated stub
    }

Form field

<?= $form->field($model, 'img')->widget(FileInput::classname(), [
        'pluginOptions' => [
            'showCaption' => false,
            'showRemove' => false,
            'showUpload' => false,
            'browseClass' => 'btn btn-primary btn-block',
            'browseIcon' => '<i class="glyphicon glyphicon-camera"></i> ',
            'browseLabel' =>  'Выбрать изображение'
        ],
        'options' => ['accept' => 'image/*']
    ]) ?>

I would also like to know the code for loading into the form when updating

Answer 1

You added the file variable, and in the form you use img, but at the same time you are trying to save a picture from file, in which it is clearly null, replace:
with
Well, here's the stupidity:
You don't have a file name in $this->img, it's null. So if you want to save with the name that the file had, then apparently like this:

$name = $file->baseName . '.' . $file->extension; //формируем имя и расширение
if($file->saveAs($dir.$name)){ //проверяем сохранилось ли
  $this->img = $name; //если сохранилось записываем имя в атрибут, который сохранит имя в базу
}

Answer 2

Goodnight.
You're using beforeSave() a little differently;

public function beforeSave($insert)
    {
      if(parent::beforeSave($insert)){
          if ($file = UploadedFile::getInstance($this, 'file')){
              $dir = Yii::getAlias('@images').'/trener/';
              if (file_exists($dir.$this->img)){
                  unlink($dir.$this->img);
              }
              if (file_exists($dir.'50x50/'.$this->img)){
                unlink($dir.'50x50/'.$this->img);
              }
              if (file_exists($dir.'/800x/'.$this->img)){
                unlink($dir.'800x/'.$this->img);
              }
              $this->img = strtotime('now').Yii::$app->getSecurity()->generateRandomString(6) . '.' .$file->extension;
              $file->saveAs($dir.$this->img);
         }     
          return true;
      }
      return false
    }

PS
In bourgeois
In native language)))))