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取如GrandChild感谢您对您的帮助提前。核心数据从父
我能够从父获取子实体,如下面的代码所示,但我想不出如何获取基于一定的儿童在父母的孙子。
如何在添加或更改我现有的代码来获得基于儿童的属性了孙子的价值观?
NSMutableArray *createdMutable = [[NSMutableArray alloc]init];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]initWithKey:@"randomAttribute" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:&sortDescriptor count:2];
NSMutableArray *sortedResults = [[NSMutableArray alloc] initWithArray: [parentEntity.parentToChild allObjects]];
[sortedResults sortUsingDescriptors:sortDescriptors];
[sortedResults valueForKey:@"randomAttribute"];
NSString *addedCreatedMutable;
for (int i = 0; [sortedResults count] > i; i++) {
addedCreatedMutable = [[sortedResults valueForKey:@"randomAttribute"]objectAtIndex:i];
addedCreatedMutable = [addedCreatedMutable stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
if ([createdMutable containsObject:addedCreatedMutable]) {
}else{
[createdMutable addObject:addedCreatedMutable];
}