I added a new extension attribute extensionattribute1 to


<attribute code="extensionattribute1" type="string">
  <join reference_table="training_extensionattributes_values" reference_field="product_id" join_on_field="entity_id">
    <field column="extensionattribute1">extensionattribute1</field>

That worked all right and the extension attribute is shining up in the collection gathered over the rest api.

Now I would like to filter the product list returned by


programmatically via the SearchCriteriaBuilder (without passing the params via rest api). In concrete: I want to return it all products where extensionattribute1 is set to the value '20'.

What I tried was to build a filter like that:


But that did not work (Invalid attribute name Error). Same with


Thanks for giving me a hint on how to reach my goal.

  • 1
    Have you tried training_extensionattributes_values.extensionattribute1? May 2, 2016 at 15:22
  • Thank you for your idea. This does not work either, I am afraid. I would be very grateful if someone could enlighten me with another idea... Nov 21, 2016 at 11:42
  • Did you guys get any solutions? Feb 4, 2019 at 6:31
  • Hey, Can you please share the solution ?! Aug 22, 2019 at 18:34
  • If you found the solution please share.I am facing similar issue.
    – tru.d
    Nov 13, 2019 at 6:29

1 Answer 1


this method you used was fine as below:


the change that I found to make the filter working was to add a filterProcessor so that you can declare the extension attribute filter as a custom filter

in the di.xml, declaring a virtual type does exactly this:

<virtualType name="Magento\Eav\Model\Api\SearchCriteria\CollectionProcessor\FilterProcessor" type="Magento\Framework\Api\SearchCriteria\CollectionProcessor\FilterProcessor">
                <argument name="customFilters" xsi:type="array">
                    <item name="training_extensionattributes_values" xsi:type="object">Mbs\ProductExtensionAttributes\Model\Api\SearchCriteria\CollectionProcessor\FilterProcessor\TrainingExtensionattributesValuesFilter</item>

finally the filter code below does the filter for my situation.

class TrainingExtensionattributesValuesFilter implements \Magento\Framework\Api\SearchCriteria\CollectionProcessor\FilterProcessor\CustomFilterInterface
     * @inheritDoc
    public function apply(Filter $filter, AbstractDb $collection)
        $collection->getSelect()->where('extension_attribute_training_extensionattributes_values.extension_value1 like ?', $filter->getValue() . '%');
        return true;

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