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我最近問了一個類似的問題，但是轉向了另一種解決方案，但現在我發現我確實需要在另一個領域中使用它。我的應用跟蹤參加錦標賽的玩家。每個玩家都會檢入，然後將他們的匹配添加到數據庫中。每個玩家可以在多天內辦理登機手續，所以有一對多的關係。每場比賽可以有兩名球員，球員可以有多場比賽，所以球員和比賽是多種關係。核心數據關係中的對象謂詞
我有三個實體：播放器，CHECKIN，並且匹配
球員實體< - >>簽入實體 球員實體< < - >>比賽實體
的Player.h：
@class CheckIn, Match;
@interface Player : NSManagedObject
@property (nonatomic, retain) NSDate * birthDay;
@property (nonatomic, retain) NSString * email;
@property (nonatomic, retain) NSString * firstName;
@property (nonatomic, retain) NSString * lastName;
@property (nonatomic, retain) NSString * playerID;
@property (nonatomic, retain) NSString * playerImage;
@property (nonatomic, retain) NSString * playerImageSmall;
@property (nonatomic, retain) NSDate * timeOfLastCheckIn;
@property (nonatomic, retain) NSNumber * isCheckedIn;
@property (nonatomic, retain) NSOrderedSet *playerCheckIns;
@property (nonatomic, retain) NSSet *playerMatches;
@end
@interface Player (CoreDataGeneratedAccessors)
- (void)insertObject:(CheckIn *)value inPlayerCheckInsAtIndex:(NSUInteger)idx;
- (void)removeObjectFromPlayerCheckInsAtIndex:(NSUInteger)idx;
- (void)insertPlayerCheckIns:(NSArray *)value atIndexes:(NSIndexSet *)indexes;
- (void)removePlayerCheckInsAtIndexes:(NSIndexSet *)indexes;
- (void)replaceObjectInPlayerCheckInsAtIndex:(NSUInteger)idx withObject:(CheckIn *)value;
- (void)replacePlayerCheckInsAtIndexes:(NSIndexSet *)indexes withPlayerCheckIns:(NSArray *)values;
- (void)addPlayerCheckInsObject:(CheckIn *)value;
- (void)removePlayerCheckInsObject:(CheckIn *)value;
- (void)addPlayerCheckIns:(NSOrderedSet *)values;
- (void)removePlayerCheckIns:(NSOrderedSet *)values;
- (void)addPlayerMatchesObject:(Match *)value;
- (void)removePlayerMatchesObject:(Match *)value;
- (void)addPlayerMatches:(NSSet *)values;
- (void)removePlayerMatches:(NSSet *)values;
@end
CheckIn.h：
@class Player;
@interface CheckIn : NSManagedObject
@property (nonatomic, retain) NSNumber * challengeBadge;
@property (nonatomic, retain) NSDate * checkInTime;
@property (nonatomic, retain) NSString * player; //convenience string with player's full name
@property (nonatomic, retain) NSNumber * spiritBadge;
@property (nonatomic, retain) NSNumber * stampsBadge;
@property (nonatomic, retain) NSNumber * triviaBadge;
@property (nonatomic, retain) Player *checkedInPlayer;
@end
Match.h
@class Player;
@interface Match : NSManagedObject
@property (nonatomic, retain) NSString * playerOne; //convenience string with player's full name
@property (nonatomic, retain) NSString * playerTwo; //convenience string with player's full name
@property (nonatomic, retain) NSDate * time;
@property (nonatomic, retain) NSString * winner; //convenience string with player's full name
@property (nonatomic, retain) NSOrderedSet *matchPlayers;
@end
@interface Match (CoreDataGeneratedAccessors)
- (void)insertObject:(Player *)value inMatchPlayersAtIndex:(NSUInteger)idx;
- (void)removeObjectFromMatchPlayersAtIndex:(NSUInteger)idx;
- (void)insertMatchPlayers:(NSArray *)value atIndexes:(NSIndexSet *)indexes;
- (void)removeMatchPlayersAtIndexes:(NSIndexSet *)indexes;
- (void)replaceObjectInMatchPlayersAtIndex:(NSUInteger)idx withObject:(Player *)value;
- (void)replaceMatchPlayersAtIndexes:(NSIndexSet *)indexes withMatchPlayers:(NSArray *)values;
- (void)addMatchPlayersObject:(Player *)value;
- (void)removeMatchPlayersObject:(Player *)value;
- (void)addMatchPlayers:(NSOrderedSet *)values;
- (void)removeMatchPlayers:(NSOrderedSet *)values;
@end
我的模型的玩家實體有這些關係： playerCheckIns爲CHECKIN與逆checkedInPlayers playerMatches與逆matchPlayers來匹配（這是有序並具有2最大值）
的比賽管理員用戶將使用桌面查看所有球員。對於每個玩家來說，他們都需要查看玩家所在比賽的列表以及玩家擁有的簽入列表。我想爲每個可以應用於我的CheckIn tableview和Match tableview的謂詞分別使用謂詞。這並不相關，但我正在使用SWTableViewCell將實用程序按鈕放入自定義tableviewcells中，並設置手動segues來處理導航。匹配和簽入視圖控制器都有一個NSPredicate *謂詞，用於處理入站謂詞。
當管理員用戶在玩家單元格中選擇匹配實用程序按鈕時，我想加載我的匹配表視圖，傳遞一個謂詞來過濾視圖以僅顯示所選玩家參與的匹配項。這將住在我的prepareforsegue方法中，以獲得適當的segue標識符。
這就是我現在對我的球員的tableview的prepareforsegue方法匹配：
Player *currentPlayer = [self.fetchedResultsController objectAtIndexPath:[self.tableView indexPathForSelectedRow]];
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SUBQUERY(match, $m, ANY $m.matchPlayers == %@)[email protected] > 0", currentPlayer];
NSLog(@"Setting predicate: %@",pred);
filteredMatchVC.predicate = pred;
我的NSLog揭示了謂詞設定爲：
SUBQUERY(match, $m, ANY $m.matchPlayers == nil)[email protected] > 0
因此，currentPlayer對象沒有被捕獲在謂詞中。
到過濾簽入視圖的轉換是相似的，但我沒有試過，但由於這個錯誤...
任何幫助，不勝感激！