There's a collection which contains product ids. I'd like to join it with the magento table that stores paroduct names, in order to add product name to collection.

$collection = Mage::getModel("productquestions/questions")->getCollection();


The table that's used to get collection is "nbpq_product_questions" and the column that stores product id is "product_id".

I've seen some code examples about left join collection, but I can't make it work in this particular case. Can you help me please?

1 Answer 1


Instead of starting from your collection, we should start from the Magento's product collection.


$collection = Mage::getModel('catalog/product')
        array('your_table' => $this->getTable('productquestions/questions')),
        'e.entity_id = your_table.product_id'

Before using this code, make sure that the $this->getTable() function is returning your table correctly. If not, that part needs to be modified based on your config.xml file's <entity> tag content.

Since Magento is saving the Product data in EAV table structure, it is not an easy task to write the correct JOIN query to get the Product name. To make it simple, Magento is proving the addAttributeToSelect method. That's why we are starting from the Product collection rather than starting from your collection.

  • But will the 'productquestions/questions' table data still be available, using this kind of join?
    – zekia
    Dec 19, 2017 at 12:04
  • @ktsixit Yes, as you can see, we are joining your table. Hence those columns will also be available in the collection. Dec 19, 2017 at 12:07
  • @ktsixit Please accept it as answer if it resolves your problem Dec 19, 2017 at 12:59
  • I need some time to test it
    – zekia
    Dec 27, 2017 at 8:36

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