ios - NSPredicate execureFetchRequest 不起作用 - 可能是由于字符串中的空格

Question

我正在尝试在 CoreData 中搜索与 recordId 和字符串名称都匹配的对象，但它并不总是找到该对象。例如，我搜索了一个 ID 为 1000 且名称为“The Brown Family”的对象（注意“The”和“Brown”之间的 2 个空格）。如果我使用：

NSPredicate *pred = [NSPredicate predicateWithFormat:@"(recordId == %@") AND (name like[cd] %@)", recordId, name];

使用 recordId=1000 和 name="The Brown Family"，获取请求返回 nil。如果我使用：

NSPredicate *pred = [NSPredicate predicateWithFormat:@"(recordId == %@"),   recordId];

如果recordId=1000，它会找到对象。如果我打印对象的 name 属性，我会得到“The Brown Family”。因此，该对象具有正确的 id 和名称，但我的 fetchRequest 失败。我究竟做错了什么？

Answer 1

You might need to enclose the value in single quotes...

NSPredicate *pred = [NSPredicate predicateWithFormat:@"(recordId == %@) AND (name like[cd] '%@')", recordId, name];

Answer 2

Sorry but I realise what the problem is now! The name I was searching for had a trailing space after it. So I was looking for say "Toby " whereas "Toby" was stored in Coredata. Sorry for wasting everyone's time.