xcode NSPredicate 'ALL 或 ANY 运算符的左侧必须是 NSArray 或 NSSet'
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NSPredicate 'The left hand side for an ALL or ANY operator must be either an NSArray or NSSet'
提问by Sean Danzeiser
Not totally sure why this isn't working now, i thought it had been working previously. Does anyone see an issue with this FetchRequest construction?
不完全确定为什么这现在不起作用，我认为它以前一直有效。有没有人看到这个 FetchRequest 结构有问题？
- (NSArray *)entriesForDate:(NSDate *)date {
NSFetchRequest *request = [[NSFetchRequest alloc]initWithEntityName:@"Entry"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY addedOn.unique like %@", [T3Utility identifierForDate:date]];
request.predicate = predicate;
NSError *error = nil;
NSArray *matches = [self.database.managedObjectContext executeFetchRequest:request error:&error];
return matches;
}
Again, i'm 99% sure that this code has been working until recently, so im thinking perhaps there's something else going on in my code somewhere . . .but when i run it through the debugger this is where is hangs. Here is my error:
再一次，我 99% 确定这段代码直到最近才有效，所以我想也许我的代码中某处发生了其他事情。. .but 当我通过调试器运行它时，这是挂起的地方。这是我的错误：
The left hand side for an ALL or ANY operator must be either an NSArray or NSSet
ALL 或 ANY 运算符的左侧必须是 NSArray 或 NSSet
Any ideas?
有任何想法吗？
thanks!
谢谢！
回答by Mundi
It seems addedOnis not a to-many relationship. Make sure you use the correct names of your attributes / relationships in the predicate. Also, note that you cannot use a to-one relationship in a "ANY" predicate.
似乎addedOn不是一对多的关系。确保在谓词中使用正确的属性/关系名称。另请注意，您不能在“ANY”谓词中使用一对一关系。
