StackOverflow2013

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14461685
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2013-01-22T15:08:19.690
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2013-01-22T15:08:19.690
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375658
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<p>I ended up going with this for anyone interested</p> <pre><code>-(BOOL)ordersAreSaneOnDay:(NSNumber*)dayNumber forUser:(User*)user inContext:(NSManagedObjectContext*)context { NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"BasicEntry" inManagedObjectContext:context]; [fetchRequest setEntity:entity]; [fetchRequest setResultType:NSDictionaryResultType]; NSPredicate *predicate = [NSPredicate predicateWithFormat: @"(status == %@) && ((type != %@) && (type != %@) && (dayNumber == %@)) && ((user == NIL) || (user == %@))",[NSNumber numberWithInt:EntryStatusAlive],[NSNumber numberWithInt:EntryTypeTask],[NSNumber numberWithInt:EntryTypeCompletedTask],dayNumber,user]; [fetchRequest setPredicate:predicate]; NSExpression *keyPathExpression = [NSExpression expressionForKeyPath: @"order"]; // Does not really matter NSExpression *maxExpression = [NSExpression expressionForFunction: @"count:" arguments: [NSArray arrayWithObject:keyPathExpression]]; NSExpressionDescription *expressionDescription = [[NSExpressionDescription alloc] init]; [expressionDescription setName: @"orderCount"]; [expressionDescription setExpression: maxExpression]; [expressionDescription setExpressionResultType: NSInteger32AttributeType]; [fetchRequest setPropertiesToFetch: [NSArray arrayWithObjects:expressionDescription,@"order",nil]]; [expressionDescription release]; [fetchRequest setPropertiesToGroupBy:[NSArray arrayWithObjects:@"order",nil]]; //[fetchRequest setHavingPredicate:[NSPredicate predicateWithFormat:@"self.order.@count > 1"]]; //[fetchRequest setHavingPredicate:[NSComparisonPredicate predicateWithLeftExpression:maxExpression rightExpression:[NSExpression expressionForConstantValue:[NSNumber numberWithInteger:1]] modifier:NSDirectPredicateModifier type:NSGreaterThanPredicateOperatorType options:NSCaseInsensitivePredicateOption]]; NSError *error; NSArray * array = [context executeFetchRequest:fetchRequest error:&error]; array = [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"orderCount > 1"]]; //NSLog(@"it worked %@",array); [fetchRequest release]; if ([array count]) return FALSE; return TRUE; </code></pre> <p>}</p>
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1. POHow do you construct the predicate for NSFetchRequest setHavingPredicate:?
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1. USthewormsterror
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