Initial commit，修正

vendor/mdmsoft/yii2-admin/components/DbManager.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace mdm\admin\components;
+
+/**
+ * DbManager represents an authorization manager that stores authorization information in database.
+ *
+ * The database connection is specified by [[$db]]. The database schema could be initialized by applying migration:
+ *
+ * ```
+ * yii migrate --migrationPath=@yii/rbac/migrations/
+ * ```
+ *
+ * If you don't want to use migration and need SQL instead, files for all databases are in migrations directory.
+ *
+ * You may change the names of the three tables used to store the authorization data by setting [[\yii\rbac\DbManager::$itemTable]],
+ * [[\yii\rbac\DbManager::$itemChildTable]] and [[\yii\rbac\DbManager::$assignmentTable]].
+ *
+ * @author Misbahul D Munir <misbahuldmunir@gmail.com>
+ * @since 1.0
+ */
+class DbManager extends \yii\rbac\DbManager
+{
+    /**
+     * Memory cache of assignments
+     * @var array
+     */
+    private $_assignments = [];
+    private $_childrenList;
+
+    /**
+     * @inheritdoc
+     */
+    public function getAssignments($userId)
+    {
+        if (!isset($this->_assignments[$userId])) {
+            $this->_assignments[$userId] = parent::getAssignments($userId);
+        }
+        return $this->_assignments[$userId];
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function getChildrenList()
+    {
+        if ($this->_childrenList === null) {
+            $this->_childrenList = parent::getChildrenList();
+        }
+        return $this->_childrenList;
+    }
+}