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multiselect attribute in customer grid

multiselect attribute in customer grid

Hi Everybody, I've added some new columns attributes successfully to my customer entity, I can display them on frontend and backend customer page too. I'm struggling now with displaying the data in the customer grid so I can export these data too.


The one I can't include are actual multiselect values I'm using the following code while extending 


in the method _preparecollection I've done this:

protected function _prepareCollection()
        $collection = Mage::getResourceModel('customer/customer_collection')
            ->joinAttribute('billing_postcode', 'customer_address/postcode', 'default_billing', null, 'left')
            ->joinAttribute('billing_city', 'customer_address/city', 'default_billing', null, 'left')
            ->joinAttribute('billing_telephone', 'customer_address/telephone', 'default_billing', null, 'left')
            ->joinAttribute('billing_region', 'customer_address/region', 'default_billing', null, 'left')
            ->joinAttribute('billing_country_id', 'customer_address/country_id', 'default_billing', null, 'left');
        return Mage_Adminhtml_Block_Widget_Grid::_prepareCollection();

I can succesfully display the gender which is a dropdown value but not customer_category, occasional_gift and personalisation which are a multiselect attribute kind.


Do you have any advice on this matter.