добавил класс ajax

controllers/AjaxController.php

+<?php
+
+namespace app\controllers;
+
+
+use app\models\Host;
+use Yii;
+use yii\db\Query;
+use yii\filters\AccessControl;
+use yii\web\Controller;
+use yii\web\Response;
+use yii\filters\VerbFilter;
+
+class AjaxController extends Controller
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function behaviors()
+    {
+        return [
+            'access' => [
+                'class' => AccessControl::className(),
+                'rules' => [
+                    [
+                        'actions' => ['calc-status'],
+                        'allow' => true,
+                        'roles' => ['@'],
+                    ],
+                ],
+            ],
+            'contentNegotiator' => [
+                'class' => 'yii\filters\ContentNegotiator',
+                'formats' => [
+                    'application/json' => Response::FORMAT_JSON,
+                ],
+            ],
+            'verbs' => [
+                'class' => VerbFilter::className(),
+                'actions' => [
+                    'get-plants' => ['GET']
+                ],
+            ],
+        ];
+    }
+
+    /**
+     * Displays homepage.
+     *
+     * @return string
+     */
+    public function actionCalcStatus()
+    {
+        $query = (new Query())->from('{{%host}}');
+        foreach ($query->batch(10) as $hosts) {
+
+        }
+
+        return [
+            'controller' => 'ajax',
+            'is_guest' => Yii::$app->user->isGuest,
+            'user_id' => Yii::$app->user->getId()
+        ];
+    }
+
+
+}