yii\mongodb\rbac\MongoDbManager::addRule PHP Method

    protected function addRule($rule)
    {
        $time = time();
        if ($rule->createdAt === null) {
            $rule->createdAt = $time;
        }
        if ($rule->updatedAt === null) {
            $rule->updatedAt = $time;
        }
        $this->db->getCollection($this->ruleCollection)->insert(['name' => $rule->name, 'data' => serialize($rule), 'created_at' => $rule->createdAt, 'updated_at' => $rule->updatedAt]);
        $this->invalidateCache();
        return true;
    }