/**
  * Creates data provider instance with search query applied
  *
  * @param array $params
  *
  * @return ActiveDataProvider
  */
 public function search($params)
 {
     $query = Publicar::find();
     $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(['like', 'id', $this->id]);
     return $dataProvider;
 }
use yii\bootstrap\Modal;
use kartik\widgets\FileInput;
/* @var $this yii\web\View */
/* @var $model app\models\Acervo */
/* @var $form yii\widgets\ActiveForm */
?>

<div class="acervo-form">   
    
    <?php 
//    die("--".$publicar);
$form = ActiveForm::begin(['type' => ActiveForm::TYPE_VERTICAL]);
?>

    <?php 
$dataPublicar = ArrayHelper::map(\app\models\Publicar::find()->asArray()->all(), 'id', 'id');
?>
    <div class="row">
        <div class="col-sm-4">     
            <?php 
echo $form->field($model, 'nombre')->textInput();
?>
        </div>

        <div class="col-sm-4">     
            <?php 
echo $form->field($model, 'nroInventario')->textInput();
?>
        </div>

        <div class="col-sm-4">
 /**
  * @return \yii\db\ActiveQuery
  */
 public function getPublicar()
 {
     return $this->hasOne(Publicar::className(), ['id' => 'publicar_id']);
 }
 /**
  * Finds the Publicar model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param string $id
  * @return Publicar the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($id)
 {
     if (($model = Publicar::findOne($id)) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }