ios - 将 NSPredicate 设置为 NSFetchRequest 后 executeFetchRequest 崩溃

Question

我真的被这个问题困扰了，我把这归咎于我生锈的 SQL/REGEX，但我希望你能帮忙。

我有这个 CoreData 实体:

@interface Movie : NSManagedObject

@property (nonatomic, retain) id genreArray;
@property (nonatomic, retain) NSNumber * imdbID;
@property (nonatomic, retain) NSNumber * isPlaying;
@property (nonatomic, retain) NSNumber * isPromo;
@property (nonatomic, retain) NSNumber * isTickets;
@property (nonatomic, retain) NSDate * lastUpdate;
@property (nonatomic, retain) NSNumber * movieID;
@property (nonatomic, retain) NSString * movieName;
@property (nonatomic, retain) NSString * movieName_EN;
@property (nonatomic, retain) id movieOtherNames;
@property (nonatomic, retain) NSString * posterPicture;
@property (nonatomic, retain) etcetcetc;

@结束

所以，我想按名称搜索电影。问题是名称可以位于 movieName 或 movieName_EN 下，也可以位于数组 movieOtherNames 内的其中一个名称内。

目前，我徒劳的请求是这样的:

    Movie* movie = nil;

    NSEntityDescription *allMovs = [NSEntityDescription entityForName:@"Movie"
                                                inManagedObjectContext:[self mainManagedObjectContext]];
    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    [request setEntity:allMovs];

    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]
                                        initWithKey:@"premiereDate" ascending:NO];
    [request setSortDescriptors:@[sortDescriptor]];

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"$movieName contains[cd] %@ OR %@ contains[cd] $movieName OR $movieName_EN contains[cd] %@ OR  %@ contains[cd] $movieName_EN OR ANY $movieOtherNames MATCHES %@", movieName, movieName, movieName, movieName, movieName];
    [request setPredicate:predicate];
    NSError *error;
    NSArray* moviesArray = [[self mainManagedObjectContext] executeFetchRequest:request error:&error];
    if(error)
        SRTLog(@"CoreData: NO movieTimes! Deal with error...");
    if([moviesArray count] > 0)
        movie = [moviesArray objectAtIndex:0];
    return movie;

我的应用在执行这段代码时崩溃了。我的猜测是 NSPredicate。那里出了点问题。

任何人都可以帮我解决如何搜索可以包含(或包含)在 2 个字段和一个字符串数组中的字符串吗？

我将为任何愿意提供帮助的好心人刷新 Stack OverFlow。

Answer 1

我认为您对这个谓词的理解有点不对。如果它解决了问题，请尝试实现它。如果没有，请添加一些错误描述和确切的行。

我希望代码本身是不言自明的:

    NSString *movieName = @""; // get the true name value
    NSArray *predicateCompounds = @[
                                    [NSPredicate predicateWithFormat:@"movieName LIKE[cd] %@", movieName],
                                    [NSPredicate predicateWithFormat:@"%@ LIKE[cd] movieName", movieName],
                                    [NSPredicate predicateWithFormat:@"movieName_EN LIKE[cd] %@", movieName],
                                    [NSPredicate predicateWithFormat:@"%@ LIKE[cd] movieName_EN", movieName]
                                    ];
    NSPredicate *predicate = [NSCompoundPredicate orPredicateWithSubpredicates:predicateCompounds];