Error - The Attribute Model Is Not Defined

Question:

Getting following errors on quick search or category pages:

• The attribute model is not defined

  or

• Call to a member function init() on a non-object in /home/*****/public_html/app/code/local/Mana/Filters/Block/View.php on line 86/87

Answer:

Underlying reason of the issue might happen, if attribute is deleted directly in DB, not in Magento admin panel. There is additional code which handles attribute deletions which is called on admin panels "Delete attribute" action and it is not called when deleted in DB.

To detect it, run the following query in phpMyAdmin:

SELECT *
FROM m_filter2_store
WHERE NOT EXISTS (SELECT * FROM m_filter2 WHERE m_filter2.id = m_filter2_store.global_id)

To fix it, run the following query in phpMyAdmin:

DELETE 
FROM m_filter2_store
WHERE NOT EXISTS (SELECT * FROM m_filter2 WHERE m_filter2.id = m_filter2_store.global_id)