的iOS簡單謂 '包含' 不工作

Question

我有一個模型：

地方< --- >>類別

當執行下面的查詢：

NSFetchRequest *req = [NSFetchRequest fetchRequestWithEntityName:@"Category"]; 
if(![searchText isEqualToString:@""] && searchText != nil){ 
    req.predicate = [NSPredicate predicateWithFormat:@"(places.placeTitle contains %@) OR (places.details contains %@) OR (name contains %@)", searchText, searchText, searchText]; 
    NSLog(@"ModelHelper.getResults: Search text given, creating predicate: %@", req.predicate); 
} 
req.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"name" 
                      ascending:YES 
                       selector:@selector(localizedCaseInsensitiveCompare:)]]; 
NSFetchedResultsController *controller = [[NSFetchedResultsController alloc]initWithFetchRequest:req 
                      managedObjectContext:context 
                       sectionNameKeyPath:nil 
                         cacheName:nil]; 
NSError *error = nil; 
[controller performFetch:&error]; 

我收到脗合，應不在那裏，例如：

searchText = "1234" 

第一個結果是：

category[0].name = "Bars" 
category[0].places[0].placeTitle = "Aaa" 
category[0].places[0].details = "Aaa" 
category[0].places[1].placeTitle = "123456" 
category[0].places[1].details = "123456" 
category[0].places[2].placeTitle = "test" 
category[0].places[2].details = "test" 

有沒有我做錯了我的謂詞？謝謝。

Answer 1

從documentation：

重要：調用此方法後，不得修改fetchRequest。例如，你不能改變它的謂詞或排序順序。

移動這個段：

if(![searchText isEqualToString:@""] && searchText != nil){ 
    req.predicate = [NSPredicate predicateWithFormat:@"(places.placeTitle contains[c] %@) OR (places.details contains[c] %@) OR (name contains[c] %@)", searchText, searchText, searchText]; 
    NSLog(@"ModelHelper.getResults: Search text given, creating predicate: %@", req.predicate); 
} 

之前初始化FRC