Question

我有一个控制器，可以返回如下发票清单：

public function show()
{
    //list all invoices
    $invoices = DB::table('invoices')
        ->join('contacts','invoices.client_id','=','contacts.id')
        ->join('invoice_items','invoices.id','=','invoice_items.invoice_id')
        ->select('*')
        ->get(); //retrieve approved users
    return View::make('dashboard/invoices/list',
        array('invoices' => $invoices));
}

我希望能够显示invoice_items表的总和，其中invoice_id对应于invoices.id。完成此任务的最佳做法是什么？我应该编写另一种方法并在刀片模板中调用它吗？还是有一些更优雅的解决方案？

Answer 1

试试这个。

您可以使用Eloquent中的groupBy和DB::raw()方法来执行COUNT

public function show()
{
    //list all invoices
    $invoices = DB::table('invoices')
        ->join('contacts','invoices.client_id','=','contacts.id')
        ->join('invoice_items','invoices.id','=','invoice_items.invoice_id')
        ->groupBy('invoices.id')
        ->select(
            array('invoices.id', DB::raw('count(*) AS cnt_items'))
        )
        ->get();
    return View::make('dashboard/invoices/list',
        array('invoices' => $invoices));
}

或者，我建议您使用预先加载http://laravel.com/docs/4.2/eloquent#eager-loading

从控制器返回项目总和的最佳实践

1 个答案: