thinkphp自定义业务逻辑有有关问题

thinkphp自定义业务逻辑有问题?
模型:

PHP code

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class DepartmentModel extends Model{
    
    public function getIndexDepart()
    {
        return 1; 
    }
      

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PHP code

 <br /> class IndexAction extends Action <br /> { <br />     public function index() <br />     { <br /> 		$a = D('Department'); <br /> 		echo " <pre class="brush:php;toolbar:false;">"; <br /> 		print_r($a->getIndexDepart()); <br /> 		echo " 

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";
        //echo THINK_PATH;
    }

}

PHP code

class IndexAction extends Action
{
    public function index()
    {
        $a = D('Department');
[color=#FF0000]        get_class($a);[/color]
        echo "<pre class="brush:php;toolbar:false;">";
        print_r($a->getIndexDepart());
        echo "

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"; //echo THINK_PATH; } }