I created a custom drop down attribute in Magento2 from admin. I tried to collect all associated products by using filters. I am able to filter product collection based on text field attributes, for example
$productcollection = $this->_productCollection
->addAttributeToSelect('*')
->addAttributeToFilter('sku', '24-MB01')
->load();
But when I try to filter using dropdown custom attribute value I'm getting an empty array
$productcollection = $this->_productCollection
->addAttributeToSelect('*')
->addAttributeToFilter('tag', 'popular')
->load();
How am I supposed to filter product collection using a dropdown attribute. Can someone help with this?