問題與提取使用NSPredicate

之前，我開始讓我給你我的數據模型看起來像核心數據對象：問題與提取使用NSPredicate

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然後我有一個獲取具有以下謂詞的請求：

NSArray *allowedPackNames = @[@"success, happiness, free"]; 
      self.fetchedResultsController = [Author MR_fetchAllGroupedBy:nil 
                  withPredicate:[NSPredicate predicateWithFormat:@"ANY quotes.quote.pack.packName IN %@", allowedPackNames] 
                   sortedBy:AuthorKeys.name 
                   ascending:YES 
                   delegate:self];

我想獲取所有帶有packName的成功或幸福或免費報價的作者。作者有一個NSSet引用，你可以在下面的關係表中看到。但是，當我執行此操作時，出現以下錯誤：

CoreData: error: (1) I/O error for database at /Users/Abdul/Library/Application Support/iPhone Simulator/6.1/Applications/DA17421B-A54D-42E3-9694-FDCBFF7F8BA4/Library/Application Support/MyCoolApp/MyCoolApp.sqlite. SQLite error code:1, 'no such column: t2.ZQUOTE' 
2013-04-05 15:26:47.175 MyCoolApp[78622:c07] Core Data: annotation: -executeRequest: encountered exception = I/O error for database at /Users/Aditya/Library/Application Support/iPhone Simulator/6.1/Applications/DA17421B-A54D-42E3-9694-FDCBFF7F8BA4/Library/Application Support/MyCoolApp/MyCoolApp.sqlite. SQLite error code:1, 'no such column: t2.ZQUOTE' with userInfo = { 
    NSFilePath = "/Users/Abdul/Library/Application Support/iPhone Simulator/6.1/Applications/DA17421B-A54D-42E3-9694-FDCBFF7F8BA4/Library/Application Support/MyCoolApp/MyCoolApp.sqlite"; 
    NSSQLiteErrorDomain = 1; 
}

任何想法爲什麼？

來源

2013-04-05 xonegirlz

如果我正確地看到它，謂語應

[NSPredicate predicateWithFormat:@"ANY quotes.pack.packName IN %@", allowedPackNames]

即你必須刪除「引用」，這是報價實體的屬性，而不是關係。

來源

2013-04-05 08:51:38

問題與提取使用NSPredicate

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