WordPress Query where meta field is not set / doesn’t exist

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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