Yii2 - why are new tags not being created?

Question

Yii

There are 2 blog.php codes - none of them can create a new tag on the blog page and save it. Why is that?

<?php

namespace common\models;

use Yii;
use common\models\Blog;
use yii\db\ActiveRecord;
/**
 * This is the model class for table "blog".
 *
 * @property integer $id
 * @property string $title
 * @property string $text
 * @property string $url
 * @property integer $status_id
 * @property integer $sort
 */
class Blog extends \yii\db\ActiveRecord {

    public $tags_array;
    /**
     * @inheritdoc
     */
    public static function tableName()
    {
        return 'blog';
    }

    /**
     * @inheritdoc
     */
    public function rules()
    {
        return [
            [['title', 'url'], 'required'],
            [['text'], 'string'],
            [['url'], 'unique'],
            [['status_id', 'sort'], 'integer'],
            [['sort'], 'integer','max'=>99, 'min'=>1],
            [['title', 'url'], 'string', 'max' => 150],
            [['tags_array'],'safe'],

        ];
    }

    /**
     * @inheritdoc
     */
    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'title' => 'Заголовок',
            'text' => 'Текст',
            'url' => 'ЧПУ',
            'status_id' => 'Статус',
            'sort' => 'Сортировка',
            'tags_array' => 'Тэги',
            'tagsAsString' => 'Тэги',
            'author.username'=>'Имя Автора',
            'author.email'=>'Почта Автора',



        ];
    }

    public static function getStatusList() {
        return ['off','on'];
    }
    public function getStatusName(){
       $list = self::getStatusList();
       return $list[$this->status_id];
    }

    public function getAuthor () {
      return $this->hasOne (User::className(),['id'=>'user_id']);
    
    }

     public function getBlogTag () {
      return $this->hasMany(BlogTag::className(),['blog_id'=>'id']);
    }

      public function getTags()
    {
      return $this->hasMany(Tag::className(),['id'=>'tag_id'])->via('blogTag');
    }

      public function getTagsAsString() 
    {  
       $arr = \yii\helpers\ArrayHelper::map($this->tags,'id','name');
       return implode (', ',$arr);
    }


      public function afterFind() 
    {  
       $this->tags_array = $this->tags;
    }

      public function afterSave ($insert, $changedAttributes) 
    {
      parent::afterSave($insert, $changedAttributes);

      $arr = \yii\helpers\ArrayHelper::map($this->tags,'id','id');
      foreach ($this->tags_array as $one) {
       if(!in_array($one,$arr)){
          $model = new BlogTag();
          $model->blog_id = $this->id;
          $model->tag_id = $one;
          $model->save();
      }
      if(isset($arr[$one])) {
         unset ($arr[$one]);
      }
      }
       BlogTag::deleteAll(['tag_id'=>$arr]);
  }
}

The second gives different errors:

<?php

namespace common\models;

use Yii;
use common\models\Blog;
use yii\db\ActiveRecord;
/**
 * This is the model class for table "blog".
 *
 * @property integer $id
 * @property string $title
 * @property string $text
  *@property string $body
  *@property string $date_publish
* @property string $url
 * @property integer $status_id
 * @property integer $sort
 */
class Blog extends \yii\db\ActiveRecord {

   /* public $tags_array;*/
   public $newtags;
    /**
     * @inheritdoc
     */
    public static function tableName()
    {
        return 'blog';
    }

    /**
     * @inheritdoc

     */

  /*public function behaviors()  error = Class 'common\models\AltBehavior' not found
    {
      return [ 
      'alt' => [
        'class' => AltBehavior::className(),
        'attribute_title' => 'title',
        'attribute_alt' =>'title',
        ],
      ];
    }*/
    /* @inheritdoc
    */




    public function rules()
    {
        return [
            [[ 'data_publish'], 'safe'],
            [['title', 'url'], 'required'],
            [['text'], 'string'],
            [['url'], 'unique'],
            [['status_id', 'sort'], 'integer'],
            [['sort'], 'integer','max'=>99, 'min'=>1],
            [['title', 'url'], 'string', 'max' => 150],
            [['newtags'],'safe'],
            [[ 'body'], 'string', 'max' =>10000],
            [[ 'social_status_id'], 'default', 'value'=>0],

        ];
    }

    /**
     * @inheritdoc
     */
    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'title' => 'Заголовок',
            'text' => 'Текст',
            'url' => 'ЧПУ',
            'body' =>'Body',
            'data_publish' => 'Data Publish',
            'social_status_id' =>'Соц.сети',
            'status_id' => 'Статус',
            'sort' => 'Сортировка',
            'newtags' => 'Тэги',
            /*agsAsString' => 'Тэги',*/
            'author.username'=>'Имя Автора',
            'author.email'=>'Почта Автора',

             ];
        }

    public static function getStatusList() {
        return ['пассив','актив', 'не сохранённый'];
    }
    public function getStatusName(){

       $list = self::getStatusList();
       return $list[$this->status_id];
    }

   /* public function getAuthor () {
      return $this->hasOne (User::className(),['id'=>'user_id']);
    
    }*/

   /*   public function getRandomImg () {
      preg_match_all ('/<img[^>]+scr="?\'?([^"\']+)"?\'?[^>]*>/i, $this->body, $images, PREG_SET_ORDER);
        $abs = Yii::$app->urlManagerFront->createAbsoluteUrl ('/');
        $url = $abs.'images/nophoto.jpg;
        if (is_array($images)){
          $count = count ($images);
          if ($count ->0) {
            $num =$count - 1;
            $rd = $rand($0,$num);
            $url = $images [$rd][1];
          }
        }
          return $url;
  
      }*/


   /*
public function getShort ($site=30) {
   $simb = ($size+8)*6
 $text = strip_tags($this->body);
   $text = \yii\helpers\StringHelper::truncute ($text,$simb,false);
   $text = \yii\helpers\StringHelper::truncuteWords ($text,$size,false);
      return $text.'...'; 

    }*/

    public function getBlogTag () {
      return $this->hasMany(BlogTag::className(),['blog_id'=>'id']);
    }

   

      public function getTags()
    {
      return $this->hasMany(Tag::className(),['id'=>'tag_id'])->via('blogTag');
    }



   public function beforeDelete()
{
  if (parent::beforeDelete()) {
    BlogTag::deleteAll (['blog_id'=>$this->id]);
        return true;
      }else{
        return false;
    }

  }
     /* public function getTagsAsString() 
    {  
       $arr = \yii\helpers\ArrayHelper::map($this->tags,'id','name');
       return implode (', ',$arr);
    }*/


      public function afterFind() 
    {  
       $this->newtags = \yii\helpers\ArrayHelper::map($this->tags,'tag','tag');
    }

      public function afterSave ($insert, $changedAttributes) 
    {
      parent::afterSave($insert, $changedAttributes);
      if (is_array($this->newtags)) {
      $old_tags = ArrayHelper::map($this->tags,'tag','id');
      foreach ($this->newtags as $one_new_tag) {
       if(isset ($old_tags[$one_new_tag])){
            unset ($old_tags[$one_new_tag]);
          }else{ 
        
        if ($tag = $this ->createNewTag($one_new_tag)){ 
        Yii::$app ->session ->addFlash('succsess','добавлен тег ' .  $one_new_tag);
      }else{ 
              Yii::$app ->session ->addFlash('error','тег' .$one_new_tag . ' не добавился');
          }
        }
      }
       BlogTag::deleteAll(['and',['blog_id'=>$this->id],['tag_id'=>$old_tags]]);
     }else{
        BlogTag::deleteAll(['blog_id'=>$this->id]);

  }
} 

private function createNewTag ($new_tag) {
  if ($tag =Tag::find()->andWhere(['tag' =>'new_tag'])->one()) {
    $tag =  new Tag ();
    $tag ->tag = $new_tag;
    if (!$tag->save() ) { 
     $tag = null;
    
        }
    }

 if ($tag instanceof Tag) { 
    $blog_tag = new BlogTag();
    $blog_tag -> blog_id = $this->id;
   $blog_tag -> tag_id =$tag->id;
    if ($blog_tag ->save())
      return $blog_tag ->id;

}
      return false;
}
}

Answer 1

Errors are quite clear. What is the problem? Can't read? Don't know English? What exactly can you help with? You threw out a bunch of code torn off from the project for no reason. If you need to solve errors:
Your variables appear out of thin air. Here is an example of a variable $text. It just came out of thin air and the error clearly indicates this.
Next, you refer to a non-existent property of the object, and the error again unambiguously indicates this.
Read at least a quick tutorial on php.