A bit of context for this. I want to extend the sales order export function (via the grid) to have more columns. I have created a module which adds a new grid for exporting and also a new collection model which extends the original. This uses the _beforeLoad() function so I can join the tables that I need.
The trouble that I'm having is that when the filters from the grid are added (the increment_id, order date etc), the where clause this adds doesn't prefix the table and I'm getting issues with ambiguous column names. For example, on increment_id I'm having the issue in the where clause:
SELECT `main_table`.*, `sales`.`total_qty_ordered`, `sales`.`entity_id` AS `order_id`, `sagepay`.`vendor_tx_code` FROM `sales_flat_order_grid` AS `main_table`
LEFT JOIN `sales_flat_order` AS `sales` ON main_table.increment_id = sales.increment_id
LEFT JOIN `sagepaysuite_transaction` AS `sagepay` ON order_id = sagepay.order_id WHERE (increment_id LIKE '%100000261%') GROUP BY `main_table`.`entity_id`
This where clause is added before I do the joins to the other tables in the _addColumnFilterToCollection() function
protected function _addColumnFilterToCollection($column)
{
if ($this->getCollection()) {
$field = ( $column->getFilterIndex() ) ? $column->getFilterIndex() : $column->getIndex();
if ($column->getFilterConditionCallback()) {
call_user_func($column->getFilterConditionCallback(), $this->getCollection(), $column);
} else {
$cond = $column->getFilter()->getCondition();
if ($field && isset($cond)) {
// Filter added at this point
$this->getCollection()->addFieldToFilter($field , $cond);
}
}
}
return $this;
}
As a brief test, I changed the line to
$this->getCollection()->addFieldToFilter('main_table.' . $field , $cond);
and this worked but it doesn't feel a great way to do it.
My code in _beforeLoad() is
protected function _beforeLoad()
{
// Join the sales_flat_order table to get order_id and and total_qty_ordered
$this->getSelect()->joinLeft(array('sales' => $this->getTable('sales/order')),
'main_table.increment_id = sales.increment_id',
array('total_qty_ordered' => 'sales.total_qty_ordered',
'order_id' => 'sales.entity_id'));
// Join the SagePay transaction table to get vendor_tx_code
$this->getSelect()->joinLeft(array('sagepay' => $this->getTable('sagepaysuite2/sagepaysuite_transaction')),
'order_id = sagepay.order_id',
array('vendor_tx_code' => 'vendor_tx_code'));
$this->getSelect()->group('main_table.entity_id');
parent::_beforeLoad();
}
I have to use increment_id to join the sales order grid table and the SagePay transaction table as that is the only common ID I can see.
Basically I'm wondering what the best approach is to tackle this. I could probably get away with doing the change I mentioned above but it doesn't feel right. Is there anything I can change in my join statements?
Thanks.