php - Magento: how to filter order list by shipping method? -

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i try create custom grid orders shipped shipping method (for example tnt). here method should filter:

protected function _preparecollection() {     $collection = mage::getresourcemodel($this->_getcollectionclass());     $this->setcollection($collection);     return parent::_preparecollection(); }

i'm going use addfieldtofilter(), don't know field name. me?

how "shipping_method" or "shipping_description". fields "sales_flat_order"


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