核心数据模型，游戏有赢家和输家，玩家有多个游戏? [英] Core data model, game has a winner and a loser, a player has multiple games?

问题描述

我正在尝试设置我的核心数据模型.我想要一款拥有一个输家和一个赢家的游戏.我需要一个拥有多个游戏的播放器.

I'm trying to setup my core data model. I want to have a game that has one loser and one winner. And I need a Player that has multiple games.

我有以下内容:

实体:播放器

属性:获胜损失，名称

关系:游戏目的地:游戏逆向:???赢家或输家?

Relationships: games Destination:Game inverse: ??? winner or loser???

实体:游戏

属性:missingScore，WinningScore，

Attributes: losingScore, winningScore,

关系:失败者目的地:玩家逆向:游戏，获胜者目的地:逆向玩家:游戏

Relationships: loser destination:Player Inverse:games, winner destination:Player Inverse:games

我该如何设置?

谢谢！

推荐答案

考虑一下...

游戏有玩家.游戏中的每个玩家都得分.他们是赢是输，这取决于他们与该游戏中其他玩家的得分相比的得分.

A game has players. Each player in the game achieves a score. Whether they win or lose depends on their score compared to the other player's score for that game.

我的建议...

• 实体:播放器
• 属性: NSString * name
• 关系: playerGames 一对多 Game

• Entity: Player
• Attribute: NSString *name
• Relationship: playerGames one-to-many Game

• 实体: Game
• 属性: NSString * reference (例如游戏"1")
• 属性: NSNumber * scorePlayer1
• 属性: NSNumber * scorePlayer2
• (属性: NSDate * timeStamp )选项?
• 关系: gamePlayer1 多对一 Player
• 关系: gamePlayer2 多对一 Player (其中玩家2不能等于玩家1)

• Entity: Game
• Attribute: NSString *reference (e.g. Game "1")
• Attribute: NSNumber *scorePlayer1
• Attribute: NSNumber *scorePlayer2
• (Attribute: NSDate *timeStamp) option?
• Relationship: gamePlayer1 many-to-one Player
• Relationship: gamePlayer2 many-to-one Player (where player 2 cannot equal player 1)

那么我们可以拥有...

So then we can have...

Game *game = [[Game alloc] init...];

if (game.scorePlayer1 > game.scorePlayer2) {
    NSLog("%@ is winner and %@ is loser with score %@-%@", game.gamePlayer1.name, gamePlayer2.name, scorePlayer1, scorePlayer2);
} else if (game.scorePlayer2 > game.scorePlayer1) {
    NSLog("%@ is winner and %@ is loser with score %@-%@", game.gamePlayer2.name, gamePlayer1.name, scorePlayer2, scorePlayer1);
} else {
    NSLog("Players %@ and %@ drew with score %@-%@", game.gamePlayer1.name, gamePlayer2.name, scorePlayer1, scorePlayer2);
}

Player *player = [[Player alloc] init...];

NSFetchRequest *requestWins = [[NSFetchRequest alloc] initWithEntity:@"Game"];
NSPredicate *predicateAsPlayer1 = [NSPredicate predicateWithFormat: @"(%@ >= %@) && (game.gamePlayer1.name == %@)", game.scorePlayer1, game.scorePlayer2, player];
NSPredicate *predicateAsPlayer2 = [NSPredicate predicateWithFormat: @"(%@ >= %@) && (game.gamePlayer2.name == %@)", game.scorePlayer2, game.scorePlayer1, player];
NSPredicate *predicate = [NSCompoundPredicate orPredicateWithSubpredicates:@[predicateAsPlayer1, predicateAsPlayer2]];
[requestWins setPredicate:predicate];
NSArray *arrayWins = [managedObjectContext executeFetchRequest:requestWins];

NSFetchRequest *requestLosses = [[NSFetchRequest alloc] initWithEntity:@"Game"];
...<repeat similar to above>...
NSArray *arrayLosses = [managedObjectContext executeFetchRequest:requestLosses];

NSInteger gamesPlayed = player.playerGames.count;
NSInteger gamesWon = arrayWins.count;
NSInteger gamesLost = arrayLosses.count;
NSInteger gamesDrawn = gamesPlayed - gamesWon - gamesLost;

希望这会有所帮助.

这篇关于核心数据模型，游戏有赢家和输家，玩家有多个游戏?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！