ios - NSPredicate 不适用于计算字段

Question

我有一个 Core Data 项目，我很难用一个简单的计算字段搜索数据，也不知道为什么它不起作用。

我有一个 Tutor 实体，具有核心数据字符串属性“tutorFirstName”和“tutorLastName”。我创建了一个额外的字符串属性“tutorFullName”，它填充在一个类别中:

NSString *fullName = [@[self.tutorFirstName, self.tutorLastName] componentsJoinedByString:@" "];

数据填充良好，但当我执行以下搜索时，只有 tutorFirstName 和 tutorLastName 上的谓词起作用:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"tutorFirstName = %@", @"Sean"];
[fetchRequest setPredicate:predicate];
NSArray *fetchedObjects = [moc executeFetchRequest:fetchRequest error:&error];
NSLog(@"Search on %@ returned %lu items (%@)",predicate, (unsigned long)fetchedObjects.count, [fetchedObjects objectAtIndex:0]);

predicate = [NSPredicate predicateWithFormat:@"tutorFullName = %@", @"Sean Silverman"];
[fetchRequest setPredicate:predicate];
fetchedObjects = [moc executeFetchRequest:fetchRequest error:&error];
NSLog(@"Search on %@ returned %lu items",predicate, (unsigned long)fetchedObjects.count);

predicate = [NSPredicate predicateWithFormat:@"tutorLastName = %@", @"Silverman"];
[fetchRequest setPredicate:predicate];
fetchedObjects = [moc executeFetchRequest:fetchRequest error:&error];
NSLog(@"Search on %@ returned %lu items (%@)",predicate, (unsigned long)fetchedObjects.count, [fetchedObjects objectAtIndex:0]);

这里是调试代码，显示了每次搜索的结果以及生成的核心数据对象确实具有正确的 tutorFullName 条目。

2014-01-21 14:05:26.129 AT Data[54935:70b] Search on tutorFirstName == "Sean" returned 1 items (<Tutor: 0x113b16830> (entity: Tutor; id: 0xd0000000041c0006 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Tutor/p263> ; data: {
charges =     (
    "0xd000000581b40002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p90221>",
    "0xd00000058b280002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p90826>",
    "0xd00000057d4c0002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p89939>",
    "0xd0000005994c0002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p91731>",
    "0xd000000593c40002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p91377>",
    "0xd0000005aa3c0002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p92815>",
    "0xd0000005ab440002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p92881>",
    "0xd0000005aa500002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p92820>",
    "0xd00000057ea00002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p90024>",
    "0xd0000005a7000002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p92608>",
    "(...and 595 more...)"
);
tutorFirstName = Sean;
tutorFullName = "Sean Silverman";
tutorLastName = Silverman;

2014-01-21 14:05:26.130 AT Data[54935:70b] Search on tutorFullName == "Sean Silverman" returned 0 items

2014-01-21 14:05:26.131 AT Data[54935:70b] Search on tutorLastName == "Silverman" returned 1 items (<Tutor: 0x113b16830> (entity: Tutor; id: 0xd0000000041c0006 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Tutor/p263> ; data: {
charges =     (
    "0xd000000581b40002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p90221>",
    "0xd00000058b280002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p90826>",
    "0xd00000057d4c0002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p89939>",
    "0xd0000005994c0002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p91731>",
    "0xd000000593c40002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p91377>",
    "0xd0000005aa3c0002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p92815>",
    "0xd0000005ab440002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p92881>",
    "0xd0000005aa500002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p92820>",
    "0xd00000057ea00002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p90024>",
    "0xd0000005a7000002 <x-coredata://B8C4C087-A68F-4CA6-935D-F596CB1E9D0C/Charge/p92608>",
    "(...and 595 more...)"
);
tutorFirstName = Sean;
tutorFullName = "Sean Silverman";
tutorLastName = Silverman;

唯一让我感到奇怪的是，在实体的调试输出中，严格的核心数据属性在字符串值周围没有双引号，但计算属性有(“Sean Silverman”) ，但这可能只是因为计算属性中有一个空格。

如有任何帮助，我们将不胜感激。

Answer 1

通过计算，我假设您的意思是该属性是暂时的。如果是这种情况，那么您将无法搜索这些属性。这是因为在对您正在搜索的所有核心数据实体执行搜索时，可能不会创建该属性。来自Core Data Programming Guide (就在 list 1 之后):

You cannot fetch using a predicate based on transient properties (although you can use transient properties to filter in memory yourself).

因此，如果您想使用谓词来过滤该属性，您需要将属性设置为非 transient 。