NSInvalidArgumentException'，reason：'谓词的未知谓词类型：BLOCKPREDICATE（0x70ad750）'错误 [英] NSInvalidArgumentException', reason: 'Unknown predicate type for predicate: BLOCKPREDICATE(0x70ad750)' Error

问题描述

我有一个核心数据库，我试图使用块谓词创建获取请求，但我得到一个未知谓词错误：

I have a core data database and I am trying to create a fetch request using a block predicate, but I get an Unknown Predicate error:

注意：employeeToHouse是属于House类型的属性，当我将NSManagedObject子类化时，为我创建了

NOTE: employeeToHouse is a property of type House that was created for me when I subclassed NSManagedObject

NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Place"];
request.predicate       = [NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
    Place *sortPlace            = (Place *)evaluatedObject;
    CLLocation *placeLocation   = [[CLLocation alloc] initWithLatitude:sortPlace.latitude.doubleValue 
                                                             longitude:sortPlace.longitude.doubleValue];
    CLLocationDistance distance = [placeLocation distanceFromLocation:self.userLocation];
    sortPlace.distanceToUser    = [NSNumber numberWithDouble:distance];
    if(distance<3000)
    {
        return YES;
    }
    return NO;
}];
request.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@ "distanceToUser" 
                                                                                 ascending:YES 
                                                                                  selector:@selector(localizedCaseInsensitiveCompare:)]];

[self.loadingView removeSpinner];
[self setupFetchedResultsControllerWithFetchRequest:request];

我得到这个错误：

NSInvalidArgumentException'，原因：'
谓词的未知谓词类型：BLOCKPREDICATE（0x70ad750）'

NSInvalidArgumentException', reason: 'Unknown predicate type for predicate: BLOCKPREDICATE(0x70ad750)'

推荐答案

AFAIK不能使用CoreData的块谓词。

AFAIK you cannot use block predicates with CoreData.

请参阅顶部投票答案： NSFetchRequest和predicateWithBlock

See top voted answer here: NSFetchRequest and predicateWithBlock

原因是CoreData无法将包含在块中的C代码转换为SQL查询。

The reason being that CoreData cannot translate C-code contained in a block into a SQL query.

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