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Can you guys give me an example of how a product alert e-mail can dispatch more than one product alert in a single e-mail ?
It seems to this point that each product a single customer is subscribed generates one e-mail, one for each product, and so the product collection on stock.phtml foreach loop always has only one product.
Thank you.
The e-mail is not sent immediately after a product gets back in stock (or the price is lowered).
There is a cron job that does the sending. You can configure the time when this runs from the backend.
Here is a scenario.
You subscribe for the stock alert for 2 products.
The products come back in stock both at the same time (or very close).
The next time the cron runs sees that you need to get 2 products in your e-mail and groups them both in the same e-mail.
See how the grouping is done in Mage_ProductAlert_Model_Observer::_processStock
crontab/jobs/catalog_product_alert/schedule/cron_expr, emptied stock of 2 products, added 2 notifications of same customer, restocked 2 products and reenabled cron, I got two e-mails.