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Find Distinct object ids of array

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// *** Find Distinct object ids of array ***
NSLog(@"Distinct id : %@",[array valueForKeyPath:@"@distinctUnionOfObjects.id"]);
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NSPredicate:
* NSPredicate
* Filter By Name
* Find movies except given ids
* Find all the objects which is of type movie
* Find Distinct object ids of array
* Find movies with specific ids
* Case Insensitive comparison with exact title match
* Case sensitive with exact title match
* Case Insensitive comparison with matching subset
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