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WordPress Query where meta field is not set / doesn’t exist
By North Street, A Creative Studio
Sometimes you need to search for a meta field that doesn’t yet exist. If that’s the case, this is the secret:
'meta_query' => array( 'relation' => 'AND', array( 'key' => 'resource_type', 'value' => '', // empty field required! 'compare' => 'NOT EXISTS' // works! ), )
http://wordpress.stackexchange.com/questions/80303/query-all-posts-where-a-meta-key-does-not-exist
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