I have a table name stat_customer look like this:

stat_customer table

I want to add a column page_view to customer collection to show at grid page. page_view is total page view of product page for each customer. My SQL query looks like:

SELECT sum(page_view) as page_view, customer_id FROM stat_customer WHERE page_type = 'product' GROUP BY customer_id;

But I don't know how to join it with customer collection. Can anyone help me please ?


I'm trying this way:

protected function _prepareCollection()
      $collection = Mage::getResourceModel('customer/customer_collection')
        ->joinAttribute('company', 'customer_address/company', 'default_billing', null, 'left');
      $collection->addExpressionAttributeToSelect("page_view", "sum({{page_view}})", "page_view");
      return parent::_prepareCollection();

But getting this error:

Fatal error: Call to a member function getBackend() on a non-object in E:\XAMPP\htdocs\stat\app\code\core\Mage\Eav\Model\Entity\Collection\Abstract.php on line 513

  • are you want to add this stat_customer table to Admin >Customer Grid.. – Amit Bera Jul 3 '15 at 7:13
  • Yes, I want to add 1 column page_view calculated by my query to customer grid. – HungDQ Jul 3 '15 at 7:14

Have a look at the methods Mage_Core_Model_Resource_Db_Collection_Abstract::addExpressionFieldToSelect() for standard models:

 * Add attribute expression (SUM, COUNT, etc)
 * Example: ('sub_total', 'SUM({{attribute}})', 'revenue')
 * Example: ('sub_total', 'SUM({{revenue}})', 'revenue')
 * For some functions like SUM use groupByAttribute.
 * @param string $alias
 * @param string $expression
 * @param array $fields
 * @return Mage_Core_Model_Resource_Db_Collection_Abstract
public function addExpressionFieldToSelect($alias, $expression, $fields)

And Mage_Eav_Model_Entity_Collection_Abstract::addExpressionAttributeToSelect() for EAV models:

 * Add attribute expression (SUM, COUNT, etc)
 * Example: ('sub_total', 'SUM({{attribute}})', 'revenue')
 * Example: ('sub_total', 'SUM({{revenue}})', 'revenue')
 * For some functions like SUM use groupByAttribute.
 * @param string $alias
 * @param string $expression
 * @param string $attribute
 * @return Mage_Eav_Model_Entity_Collection_Abstract
public function addExpressionAttributeToSelect($alias, $expression, $attribute)


$collection->addExpressionFieldToSelect("page_view", "sum({{page_view}})", ["page_view"]);
//                                      ^ alias      ^ expression          ^ used fields



$collection->addExpressionAttributeToSelect("page_view", "sum({{page_view}})", "page_view");
//                                          ^ alias      ^ expression          ^ used attribute


Note that the method suggested in the doc block, groupByAttribute() is only used to group by EAV attributes, not static columns like the entity id.

  • Good answer.. I just typing answer.. But you give first +V1 – Amit Bera Jul 3 '15 at 7:28
  • 1
    Not sure why I got this error: Call to undefined method Mage_Customer_Model_Resource_Customer_Collection::addExpressionFieldToSelect(). My collection is: $collection = Mage::getResourceModel('customer/customer_collection'). I'm using magento – HungDQ Jul 3 '15 at 7:33
  • OK for EAV collections like the customer collection it works a bit different. See updated answer – Fabian Schmengler Jul 3 '15 at 7:38
  • 1
    it cannot be the same error with the method name addExpressionAttributeToSelect – Fabian Schmengler Jul 3 '15 at 7:52
  • 1
    OK, I think I understand the problem: addExpressionAttributeToSelect only works with expressions based on actual EAV attributes, not joined tables, while addExpressionFieldToSelect is not available. You should use joinTable and specify the expression as Zend_Db_Expr. I will update the answer later with more information when I find the time – Fabian Schmengler Jul 3 '15 at 8:14

I've found my answered by using the following join:

$statTable = Mage::getSingleton('core/resource')->getTableName('stat_customer');
      ->join(array("stat" => $statTable), "e.entity_id = stat.customer_id", array("*","sum(stat.page_view) as page_view" ))
      ->where('stat.page_type = "product"')

It works great.



Need to add this table magento to Customer collection on prepareCollection() at class Mage_Adminhtml_Block_Customer_Grid

$subSelect =  Mage::getSingleton( 'core/resource' )->getConnection( 'core_read' )->select()
                 ->from(array('o' =>'stat_customer'), 'SUM(o.page_view)')
                 ->where('o.customer_id = e.entity_id ')
        $subSelect->where('o.page_type = ?', 'product') ;

$collection->getSelect()->columns(array('page_view_count' => $subSelect))->group("o.customer_id");


You need to this column on grid using addColumn function _prepareColumns() (class Mage_Adminhtml_Block_Customer_Grid )

protected function _prepareColumns()
            'header'=> Mage::helper('customer')->__('Page View'),
            'width' => '50px',
            'index' => 'page_view_count',
    return parent::_prepareColumns();
  • I've got this error: Column not found: 1054 Unknown column 'o.customer_id' in 'group statement'. I'm not sure why :( – HungDQ Jul 3 '15 at 8:31

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