NSPredicate 字符串与 NSSet 匹配
我正在尝试使用 NSPredicate 来搜索与生成的 CoreData 对象数组相匹配的字符串，如下所示：
// Grab an array of all Company projects
NSArray *array = [[company projects] allObjects];
我使用以下谓词将任何项目名称、公司名称或客户名称与不区分大小写的字符串匹配（注意：这应该允许部分匹配，以便“App”将匹配“Apple Inc.”等）：
(name LIKE[cd] %@) OR (ANY companies.name LIKE[cd] %@) OR (ANY companies.clients.name LIKE[cd] %@)
谓词中提到的 CoreData 关系如下所示：
SELF -> (NSString *) name
SELF -> (NSSet *) companies -> (NSString *) name
SELF -> (NSSet *) companies -> (NSSet *) -> clients -> (NSString *) name
每当我尝试按上述谓词进行过滤时，我都会在控制台中找到以下内容：
HIToolbox: ignoring exception 'Can't do regex matching on object {(
"Apple Inc.",
"Test Co.",
Microsoft
)}.'
如果我理解正确的话，看起来好像尝试匹配键路径“companies.clients.name”会返回一个 NSSet （或其他对象），其中需要 NSString （名称）。
我做错了什么？
I'm trying to use an NSPredicate to search for string matches against an array of CoreData objects generated like so:
// Grab an array of all Company projects
NSArray *array = [[company projects] allObjects];
I use the following predicate to match any project names, company names or client names with a case-insensitive string (note: this should allow for partial matches, so that 'App' will match 'Apple Inc.', etc):
(name LIKE[cd] %@) OR (ANY companies.name LIKE[cd] %@) OR (ANY companies.clients.name LIKE[cd] %@)
The CoreData relationships mentioned in the predicate look like so:
SELF -> (NSString *) name
SELF -> (NSSet *) companies -> (NSString *) name
SELF -> (NSSet *) companies -> (NSSet *) -> clients -> (NSString *) name
Whenever I attempt to filter by the above predicate, I find the following in my Console:
HIToolbox: ignoring exception 'Can't do regex matching on object {(
"Apple Inc.",
"Test Co.",
Microsoft
)}.'
If I'm understanding things correctly, it looks as though trying to match against the keypath "companies.clients.name" returns an NSSet (or other object) where an NSString (name) was expected.
What am I doing wrong?
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companies.clients.name将返回NSSet的集合，其中集合中的每个元素都是一个公司的客户名称的内容（即一个NSSet>）。您可能想要使用[电子邮件受保护]在你的谓词字符串中。请参阅使用指南 键值编码中的集合和数组运算符。
companies.clients.namewill return collection ofNSSets, where each element in the colletion is the contents of one companie's client's names (i.e. anNSSet). You probably want to use[email protected]in your predicate string.See the guide on using Set and Array Operators in Key-Value Coding.