I am trying to add a column to the catalog/product grid. So far I have been able to create the column but have been unable to populate it here is what it looks like now updated product grid

So far I've tried this


and this

    $volIdsTable = Mage::getSingleton('core/resource')->getTableName('fpm_volumes/volume_product');
    $collection->getSelect()->join(array('volIds' => $volIdsTable), 'e.entity_id = volIds.product_id', array('volume_id'));
    $volsTable = Mage::getSingleton('core/resource')->getTableName('fpm_volumes/volume');
    $collection->getSelect()->join(array('volumes' => $volsTable), 'main_table.volume_id = volumes.entity_id', array('volume_name'));

but none of that works and when I try the second way, using getSelect(), I get this error

Column not found: 1054 Unknown column 'main_table.volume_id' in 'on clause'

my association table looks like this

association table

and the custom table from where I want to retrieve the data(volume_name) looks like this volumes table

In the catalog/product table the entity_id(s) are the same as the product_id(s) in the fpm_volumes_volume_product table. However, the volume_name is in the fpm_volumes_volume table.

So can some one guide me through the process of "adding" volume_name to the catalog/product collection by using fpm_voulmes_volume_product as the "bridge" between the catalog/product collection and my fpm_volumes_volume table in order to populate my Volumes column? Thanks everyone!

1 Answer 1


The error shows that main_table.volume_id does not exist, because main_table is the alias for the product entity table which does not contain a column volume_id.

You have defined volIds as alias for your volume_product association table. So you need to change it

Change from

$collection->getSelect()->join(array('volumes' => $volsTable),
    'main_table.volume_id = volumes.entity_id', array('volume_name'));


$collection->getSelect()->join(array('volumes' => $volsTable),
    'volIds.volume_id = volumes.entity_id', array('volume_name'));

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