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POTrying to filter NSMutableArray with NSPredicate and getting error
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  1. POTrying to filter NSMutableArray with NSPredicate and getting error
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    copied!<p>I'm trying to filter the results of a list of employee contacts that I keep in my app but am getting the following error : 'Can't use in/contains operator with collection LAST (not a collection)'</p> <p>I've tried several variations with the NSPredicate command, self, self.last, employee.last, last == 'smith' (this one doesn't generate an error but doesn't return any results). </p> <pre><code>NSMutableArray *employeesList = [[NSMutableArray alloc] init]; Person2 *employee = [[Person2 alloc] init]; employee.first = @"bob"; employee.last = @"black"; [employeesList addObject:employee]; employee = [[Person2 alloc] init]; employee.first = @"jack"; employee.last = @"brown"; [employeesList addObject:employee]; employee = [[Person2 alloc] init]; employee.first = @"george"; employee.last = @"smith"; [employeesList addObject:employee]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"last contains[cd] %@", @"black"]; NSArray *filteredKeys = [employeesList filteredArrayUsingPredicate:predicate]; NSLog(@"filtered : %@",filteredKeys); </code></pre> <p>[person2.h]</p> <pre><code>@interface Person2 : NSObject { @private } @property (nonatomic, retain) NSString *first; @property (nonatomic, retain) NSString *last; + (Person2 *)personWithFirst:(NSString *)first andLast:(NSString *)last; @end </code></pre> <p>[person2.m]</p> <pre><code>#import "Person2.h" @implementation Person2 @synthesize first, last; - (id)init { self = [super init]; if (self) { } return self; } + (Person2 *)personWithFirst:(NSString *)first andLast:(NSString *)last { Person2 *person = [[Person2 alloc] init]; [person setFirst:first]; [person setLast:last]; return person; } - (NSString *)description { return [NSString stringWithFormat:@"%@ %@", [self first], [self last]]; } @end </code></pre>
 

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