ios - NSPredicate apply predicate on an Object within an object array. -

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i have array, containing objects of order item class, , in each order item there article object in it, contains details.

now want order items have specific name in article of individual order item. how should write nspredicate?

what trying like: 

   nspredicate *predicate = [nspredicate predicatewithformat:@"self.itemarticle.articlename contains[c] '%@'", searchstring];    nsarray *resultsarray = [allorderitemarray filteredarrayusingpredicate: predicate];

try removig both self. part , single quotes place holder (and close double quotes).

nspredicate *predicate = [nspredicate predicatewithformat:@"itemarticle.articlename contains[c] %@", searchstring]; nsarray *resultsarray = [allorderitemarray filteredarrayusingpredicate: predicate];

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