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Filename : SubFormerEventsSearch.php
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<?php

namespace app\models;

use Yii;
use yii\base\Model;
use yii\data\ActiveDataProvider;
use app\models\FormerEvents;

/**
* FoundationSearch represents the model behind the search form about `app\models\Foundation`.
*/
class SubFormerEventsSearch extends FormerEvents
{
/**
* @inheritdoc
*/
public function rules()
{
return [
[['id'], 'integer'],
            [['title_az', 'title_en', 'content_az', 'content_en'], 'safe'],
];
}

/**
* @inheritdoc
*/
public function scenarios()
{
// bypass scenarios() implementation in the parent class
return Model::scenarios();
}

/**
* Creates data provider instance with search query applied
*
* @param array $params
*
* @return ActiveDataProvider
*/
public function search($params)
{
$query = FormerEvents::find()->where(['root' => NULL])->orderBy([
  'id' => SORT_DESC
]);

$dataProvider = new ActiveDataProvider([
'query' => $query,
]);

$this->load($params);

if (!$this->validate()) {
// uncomment the following line if you do not want to return any records when validation fails
// $query->where('0=1');
return $dataProvider;
}

$query->andFilterWhere([
            'id' => $this->id,
            //'add_date' => $this->add_date,
            //'active' => $this->active,
        ]);

        $query->andFilterWhere(['like', 'title_az', $this->title_az])
            ->andFilterWhere(['like', 'content_az', $this->content_az]);

return $dataProvider;
}
}