class Easylife_Vendor_Block_Adminhtml_Order_Grid extends Mage_Adminhtml_Block_Widget_Grid {

    public function __construct() {
        parent::__construct();
        $this->setId('orderGrid');
        $this->setDefaultSort('id');
    }

    protected function _prepareCollection() {
        $roleId = Mage::helper('vendor')->getConfig('general', 'vendor_role');

        // $role = Mage::getModel('admin/roles')->load($roleId);

        $current_user = Mage::getSingleton('admin/session')->getUser();

        if ($current_user->getRole()->getRoleId() == $roleId) {
            $productIds = Mage::getModel('catalog/product')->getCollection()
                            ->addAttributeToFilter('status', 1)
                            ->addAttributeToFilter('vendor', $current_user->getId())->getAllIds();

            $collection = Mage::getResourceModel($this->_getCollectionClass());

            foreach ($collection as $order) {
                foreach ($order->getAllItems() as $item) {
                    $productId = $item->getData('product_id');
                    if (in_array($productId, $productIds)) {
                        Mage::log($order);
                        Mage::log($order->getDropShipVendor());
                            $orderIds[] = $order->getId();
                            break;

                    }
                }
            }

            $collection = Mage::getResourceModel($this->_getCollectionClass())
                    ->addFieldToFilter('entity_id', array('in' => $orderIds));
        }
        else
            $collection = Mage::getResourceModel($this->_getCollectionClass());

        $this->setCollection($collection);
        return parent::_prepareCollection();
    }

    protected function _getCollectionClass() {
        return 'sales/order_grid_collection';
    }

    protected function _prepareColumns() {

        ......

        return parent::_prepareColumns();
    }

    public function getRowUrl($row) {
        return $this->getUrl('*/*/view', array('order_id' => $row->getId()));
    }

}

[item_id] => 57
                                    [order_id] => 45
                                    [parent_item_id] =>
                                    [quote_item_id] => 91
                                    [store_id] => 1
                                    [created_at] => 2014-12-18 10:46:07
                                    [updated_at] => 2014-12-18 10:46:07
                                    [product_id] => 9
                                    [product_type] => simple
                                    [product_options] => a:1:{s:15:"info_buyRequest";a:3:{s:4:"uenc";s:100:"aHR0cDovLzEwLjEwLjEwLjE4NC9tYWdlbnRvbGVhcm5pbmcvaW5kZXgucGhwL2VsZWN0cm9uaWNzL2NlbGwtcGhvbmVzLmh0bWw,";s:7:"product";s:1:"9";s:3:"qty";i:1;}}
                                    [weight] => 1.0000
                                    [is_virtual] => 0
                                    [sku] => 123123
                                    [name] => Iphone 6s
                                    [description] =>
                                    [applied_rule_ids] =>
                                    [additional_data] =>
                                    [free_shipping] => 0
                                    [is_qty_decimal] => 0
                                    [no_discount] => 0
                                    [qty_backordered] =>
                                    [qty_canceled] => 0.0000
                                    [qty_invoiced] => 0.0000
                                    [qty_ordered] => 1.0000
                                    [qty_refunded] => 0.0000
                                    [qty_shipped] => 0.0000
                                    [base_cost] =>
                                    [price] => 30.0000
                                    [base_price] => 30.0000
                                    [original_price] => 30.0000
                                    [base_original_price] => 30.0000
                                    [tax_percent] => 0.0000
                                    [tax_amount] => 0.0000
                                    [base_tax_amount] => 0.0000
                                    [tax_invoiced] => 0.0000
                                    [base_tax_invoiced] => 0.0000
                                    [discount_percent] => 0.0000
                                    [discount_amount] => 0.0000
                                    [base_discount_amount] => 0.0000
                                    [discount_invoiced] => 0.0000
                                    [base_discount_invoiced] => 0.0000
                                    [amount_refunded] => 0.0000
                                    [base_amount_refunded] => 0.0000
                                    [row_total] => 30.0000
                                    [base_row_total] => 30.0000
                                    [row_invoiced] => 0.0000
                                    [base_row_invoiced] => 0.0000
                                    [row_weight] => 1.0000
                                    [base_tax_before_discount] =>
                                    [tax_before_discount] =>
                                    [ext_order_item_id] =>
                                    [locked_do_invoice] =>
                                    [locked_do_ship] =>
                                    [price_incl_tax] => 30.0000
                                    [base_price_incl_tax] => 30.0000
                                    [row_total_incl_tax] => 30.0000
                                    [base_row_total_incl_tax] => 30.0000
                                    [hidden_tax_amount] =>
                                    [base_hidden_tax_amount] =>
                                    [hidden_tax_invoiced] =>
                                    [base_hidden_tax_invoiced] =>
                                    [hidden_tax_refunded] =>
                                    [base_hidden_tax_refunded] =>
                                    [is_nominal] => 0
                                    [tax_canceled] =>
                                    [hidden_tax_canceled] =>
                                    [tax_refunded] =>
                                    [base_tax_refunded] =>
                                    [discount_refunded] =>
                                    [base_discount_refunded] =>
                                    [gift_message_id] =>
                                    [gift_message_available] => 0
                                    [base_weee_tax_applied_amount] => 0.0000
                                    [base_weee_tax_applied_row_amnt] => 0.0000
                                    [base_weee_tax_applied_row_amount] => 0.0000
                                    [weee_tax_applied_amount] => 0.0000
                                    [weee_tax_applied_row_amount] => 0.0000
                                    [weee_tax_applied] => a:0:{}
                                    [weee_tax_disposition] => 0.0000
                                    [weee_tax_row_disposition] => 0.0000
                                    [base_weee_tax_disposition] => 0.0000
                                    [base_weee_tax_row_disposition] => 0.0000