CloudKit NSPredicate的意外表达 [英] CloudKit Unexpected Expression for NSPredicate
问题描述
我正在使用CloudKit并希望根据字符串字段搜索记录。
I'm using CloudKit and wish to perform a search for records based on their string fields.
Apple文档说这是对记录字段进行标记化搜索的方法：
Apple docs say this is the way to do a tokenized search of a record's fields:
要对记录的字段执行标记化搜索，请使用特殊运算符self。标记化搜索会搜索启用了全文搜索的任何字段，默认情况下这是所有基于字符串的字段。清单5显示了一个示例，它在记录的字段中搜索令牌字符串bob和smith。为了搜索，每个不同的单词被视为单独的标记。比较是不区分大小写和不区分大小写的。这些令牌字符串可以在单个字段或多个字段中找到，但所有令牌必须存在于记录中才能被视为匹配。
To perform a tokenized search of a record’s fields, use the special operator self. A tokenized search searches any fields that have full-text search enabled, which is all string-based fields by default. Listing 5 shows an example that searches the fields of the record for the token strings bob and smith. Each distinct word is treated as a separate token for the purpose of searching. Comparisons are case- and diacritic-insensitive. These token strings may be found in a single field or in multiple fields but all of the tokens must be present in a record for it to be considered a match.
清单5 ：匹配包含标记化字符串的字段
Listing 5: Matching a field containing a tokenized string
NSPredicate predicate = nil;
predicate = [NSPredicate predicateWithFormat:@"self contains 'bob smith'"];
当我为谓词输入这个确切的字符串时，我得到了例外。
When I enter this exact string for the predicate, I get the an exception.
代码：
predicate = [NSPredicate predicateWithFormat:@"self contains 'bob smith'"];
query = [[CKQuery alloc] initWithRecordType:kCKRecord_Level predicate:predicate];
例外：
*** Terminating app due to uncaught exception 'CKException', reason: 'Unexpected expression: SELF CONTAINS "bob smith"'
任何想法可能出错？有没有人使用该谓词字符串和CloudKit取得任何成功？
Any ideas what could be wrong? Has anyone had any success with that predicate string and CloudKit?
推荐答案
看起来自包含不再起作用了。您仍然使用此谓词进行标记化搜索：
It looks like the 'self contains' does not work anymore. You still do a tokenized search using this predicate:
NSPredicate(format: "allTokens TOKENMATCHES[cdl] %@", "bob smith")
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