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How can i add " AND (at_product_userclass.value IS NULL) OR !FIND_IN_SET('1', at_product_userclass.value)" filter condition using addAttributeToFilter in product collection.

Thanks

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To filter by null values, you can use this:

$collection->addFieldToFilter(
    'name_of_field',
    ['null' => true]
);

To use mysql query in collection, use this:

$collection->where(new \Zend_Db_Expr('[your_sql_expression]'));

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