Фильтрация сетки yii2 не работает

мой фильтр сетки не фильтрует категории, я дал category_id для nesserray мест, но все же он не фильтрует мои сообщения в соответствии с их category_id, пожалуйста, помогите мне. вот мои исходники:
пост -> index.php

<?= GridView::widget([ 'dataProvider' => $dataProvider, 'filterModel' => $searchModel, 'columns' => [ ['class' => 'yii\grid\SerialColumn'], 'title', [ 'attribute'=>'category_id', 'value'=>function($model) { return $model->category->name; }, 'filter'=>$category ], [ 'attribute'=>'user_id', 'value'=>function($model) { return $model->user->fullname; }, 'filter'=>$user, 'label'=>'user' ], 'category.name', 'user.fullname', // 'user_id', // 'description', // 'content:html', 'count_view', 'status', 'created_at', ['class' => 'yii\grid\ActionColumn'], ], ]); ?> 

и вот модель / postSearch.php

 <?php namespace app\models\search; use Yii; use yii\base\Model; use yii\data\ActiveDataProvider; use app\models\post; /** * PostSearch represents the model behind the search form about `app\models\post`. */ class PostSearch extends post { /** * @inheritdoc */ public function rules() { return [ [['id', 'user_id','category_id', 'count_view'], 'integer'], [['title', 'description', 'content', 'status', 'created_at'], '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 = post::find(); // add conditions that should always apply here $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; } // grid filtering conditions $query->andFilterWhere([ 'id' => $this->id, 'category_id' => $this->category_id, 'user_id' => $this->user_id, 'count_view' => $this->count_view, 'created_at' => $this->created_at, ]); $query->andFilterWhere(['like', 'title', $this->title]) ->andFilterWhere(['like', 'description', $this->description]) ->andFilterWhere(['like', 'content', $this->content]) ->andFilterWhere(['like', 'status', $this->status]); return $dataProvider; } }