I have custom affiliates module with grid.this affiliate module grid has list of orders placed by the affiliate customer group. in this grid i had added some columns array('billing_name','created_at','base_grand_total','grand_total','status') from sales order grid and shipment number from the sales_flat_shipment using join in magento.Following is my query.

$collection->join(array('og' =>'sales/order_grid'), 'main_table.order_id = og.entity_id', array('billing_name','created_at','base_grand_total','grand_total','status'));
$collection->getSelect()->joinLeft(array('sfs' =>'sales_flat_shipment'), 'main_table.order_id = sfs.order_id','increment_id as shipment_id');

I am getting this join columns added and data also populated in the affiliate grid with no issue.

The issue is when i am trying to export this grid i am getting the following issue

Item (Neo_Affiliate_Model_Affiliate) with the same id "2977" already exist

When i printed the collection object i see affiliate_id which is primary key of the affiliate module has 2977 twice.so i came to know that if primary key dupliacates then above issue comes.

in the collection i have 2977 duplicate because for order number lets assume 10000011 has 2 shipments so their collection object has 2977 twice with one record as shipment 1 and another record as shipment 2.

i had tryied this issue on google and tried many soultions like




this issue only coming when i am trying to export.it is not coming when the grid is displaying the records.

Note:- Affiliate table contains records of orders details by affiliates


protected function _prepareCollection()
            $collection = Mage::getModel('neoaffiliate/affiliate')->getCollection();
            $collection->join(array('og' =>'sales/order_grid'), 'main_table.order_id = og.entity_id', array('billing_name','created_at','base_grand_total','grand_total','status'));
            $collection->getSelect()->joinLeft(array('sfs' =>'sales_flat_shipment'), 'main_table.order_id = sfs.order_id','increment_id as shipment_id');

            // tryed code


            return parent::_prepareCollection();
  • In which file did you try above changes? Sep 9, 2015 at 9:43
  • in grid.php which is in the block. (Neo_Affiliate_Block_Adminhtml_Manage_Affiliate_Grid) Sep 9, 2015 at 9:44
  • in _prepareCollection method Sep 9, 2015 at 9:45
  • Isn't primary key supposed to be unique all the time? Sep 9, 2015 at 9:51
  • primary key is unique in the affiliate table.but since because of join and my order has two shipment number for that order thats y that afiiliate order id with 2977 is repeated twice in the collection Sep 9, 2015 at 9:58

1 Answer 1


I believe the problem is that for the export the collection is cloned1 and any modifications that you made to the Zend_Db_Select instance directly get lost.

In this case I see two options:

  1. override _exportIterateCollection() to add $collection->getSelect()->distinct(true) to the cloned collection, or
  2. implement __clone() in the collection to always add DISTINCT to clones:

    public function __clone()

1) see: Mage_Adminhtml_Block_Widget_Grid::_exportIterateCollection


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