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vendor/yiisoft/yii2/rest/ViewAction.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\rest;
+
+use Yii;
+
+/**
+ * ViewAction implements the API endpoint for returning the detailed information about a model.
+ *
+ * For more details and usage information on ViewAction, see the [guide article on rest controllers](guide:rest-controllers).
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class ViewAction extends Action
+{
+    /**
+     * Displays a model.
+     * @param string $id the primary key of the model.
+     * @return \yii\db\ActiveRecordInterface the model being displayed
+     */
+    public function run($id)
+    {
+        $model = $this->findModel($id);
+        if ($this->checkAccess) {
+            call_user_func($this->checkAccess, $this->id, $model);
+        }
+
+        return $model;
+    }
+}