I have filed 'read' in alireza_checkingout_checkingout table I want to add condition if read =0 in query below, I alreadt tried ->addFieldToFilter('read', array('eq' => 0)) but the system return an error "fatal error: Call to a member function getBackend() on boolean in /var/www/html/megadump/app/code/core/Mage/Eav/Model/Entity/Abstract.php on line 816"

$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');
 $collection->getSelect()->columns('count(alireza_customer_id) as cc')->group('entity_id');

 return Mage_Adminhtml_Block_Widget_Grid::_prepareCollection();

2 Answers 2


In EAV models, like the customer, addFieldToFilter is an alias for addAttributeToFilter and only works if the parameter ("read" in your case) is a real EAV attribute of the customer and not a field in the customer_entity table, or any other table.

The error message hints that there is no attribute ($attribute->getBackend() fails because there was no attribute found).

But if read actually is a field in the entity table, you can tell the collection so, using addStaticField():

$collection->addStaticField('read')->addFieldToFilter('read', array('eq' => 0));

Update: I see that the field actually is from a joined table. You need to use joinAttribute or joinField to allow using the field for filters.

I assume, alireza_checkingout_checkingout is a regular table, not an EAV entity:




->joinField('read', 'alireza_checkingout_checkingout', 'read', 'alireza_customer_id=entity_id')

You can even add the filter immediately, as joinField has a $cond parameter:

->joinField('read', 'alireza_checkingout_checkingout', 'read', 'alireza_customer_id=entity_id', '{table}.read=0')

The condition will be added to the ON clause of the join, which is by default an INNER JOIN, so the result is the same as using addFieldToFilter.


you should use


bellow link will help to understand.


I hope will help you.

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