NSPredicate'ALL或ANY运算符的左侧必须是NSArray或NSSet' [英] NSPredicate 'The left hand side for an ALL or ANY operator must be either an NSArray or NSSet'

问题描述

不完全确定为什么现在不工作，我以为它以前一直在工作。是否有人看到此FetchRequest构造的问题？

   - （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]; 
 
返回匹配项; 
} 
  

再次，我99％确信这个代码一直工作到最近，所以im思考也许有一些其他的东西在我的代码在某个地方。 。 。但是当我运行它通过调试器，这是挂起的地方。这是我的错误：

ALL或ANY运算符的左侧必须是NSArray或NSSet

解决方案

似乎

code> addedOn 不是一对多的关系。请确保在谓词中使用正确的属性/关系名称。此外，请注意，您不能在任何谓词中使用一对一关系。

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?

- (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:

The left hand side for an ALL or ANY operator must be either an NSArray or NSSet

Any ideas?

thanks!

解决方案

It seems addedOn is 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.

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