public function getBudgetCategory($isForceReload = false)
    {
        if ($isForceReload || null === $this->joinOneCacheBudgetCategory) {
            $mapper = new BudgetCategoryMapper($this->dependencyContainer->getDatabase('money'));
            $this->joinOneCacheBudgetCategory = $mapper->findByKeys(array(
                'category_id' => $this->getId(),
            ));
        }
        
        return $this->joinOneCacheBudgetCategory;
    }