Proste rozwiązanie zapisania się do newslettera do kilku sklepów na ten sam adres e-mail na jednej instalacji Magento.

Plik app/code/core/Mage/Newsletter/Model/Mysql4/Subscriber.php kopiujemy do  app/code/local/Mage/Newsletter/Model/Mysql4/Subscriber.php, zmieniamy funkcję loadByEmail($subscriberEmail) na:

<?php
public function loadByEmail($subscriberEmail) {
/** @var $customerSession Mage_Customer_Model_Session */
$customerSession = Mage::getSingleton('customer/session');
$ownerId = Mage::getModel('customer/customer')
->setWebsiteId(Mage::app()->getStore()->getWebsiteId())
->loadByEmail($subscriberEmail)
->getId();
$storeId = $customerSession->isLoggedIn() && $ownerId == $customerSession->getId()
? $customerSession->getCustomer()->getStoreId()
: Mage::app()->getStore()->getId();
$select = $this->_read->select()
->from($this->getMainTable())
->where('subscriber_email=:subscriber_email')
->where('store_id=:store_id'); // Add store ID for newsletters
$result = $this->_read->fetchRow($select, array(
'subscriber_email' => $subscriberEmail,
'store_id' => $storeId
));
if (!$result) {
return array();
}
return $result;
}
?>

oraz funkcję loadByCustomer(Mage_Customer_Model_Customer $customer) na:

<?php
public function loadByCustomer(Mage_Customer_Model_Customer $customer) {
$select = $this->_read->select()
->from($this->getMainTable())
->where('customer_id=:customer_id')
->where('store_id=:store_id');
$result = $this->_read->fetchRow($select, array(
'customer_id' => $customer->getId(),
'store_id' => $customer->getStoreId()
));
if ($result) {
return $result;
}
$select = $this->_read->select()
->from($this->getMainTable())
->where('subscriber_email=:subscriber_email')
->where('store_id=:store_id');
$result = $this->_read->fetchRow($select, array(
'subscriber_email' => $customer->getEmail(),
'store_id' => $customer->getStoreId()
));
if ($result) {
return $result;
}
return array();
}
?>

Rozwiązanie sprawdzone na wersjach Magento >= 1.4.x.x.