自定义对象IN NSSet NSPredicate with SQL

时间:2014-10-22 23:03:24

标签: sql debugging core-data nspredicate nsset

NSManagedObject具有Transformable属性,我用它来存储NSMutableOrderedSet。

此set包含自定义对象(不是NSManagedObject的子类),它们实现NSCoding并覆盖isEqual:和hash方法。

我有一个NSPredicate来检查这个集合是否包含传递的对象。

谓词基本上就是这个:

[NSPredicate predicateWithFormat:@"%@ IN %K", theObjectToCheck, @"propertyNameForTheSet"];

它适用于内存中的数据库,但使用SQL会触发BAD ACCESS错误。

我启用了所有诊断功能。

sql debug类似于:

CoreData: sql: SELECT COUNT( DISTINCT t0.Z_PK) FROM ZIMPLEMENTED_ABSTRACT_ENTITY_NAME t0 WHERE ( NSCoreDataStringSearch( t0.ZPROPERTYNAMEFORTHESET1, ?, 0, 0) AND  t0.Z_ENT = ?) 
CoreData: details: SQLite bind[0] = theObjectToCheckAsString(not-hash)
CoreData: details: SQLite bind[1] = 6

堆栈跟踪是:

0   ???                                 0x00000001eee4d8dc 0x0 + 8302942428,
1   Spatch                              0x00000001020d5ee0 main + 0, 
2   CoreData                            0x000000010386ee26 _NSCoreDataStringSearch + 246,
3   libsqlite3.dylib                    0x0000000107337384 sqlite3VdbeExec + 16100,
4   libsqlite3.dylib                    0x000000010728e4ff sqlite3_step + 527,
5   CoreData                            0x0000000103820070 _execute + 112,
6   CoreData                            0x000000010381fd0b -[NSSQLiteConnection execute] + 1835,
7   CoreData                            0x0000000103879b18 -[NSSQLChannel selectCountWithFetchRequest:] + 168,
8   CoreData                            0x00000001038796b5 -[NSSQLCore countForFetchRequest:inContext:] + 405,
9   CoreData                            0x0000000103825f01 -[NSSQLCore executeRequest:withContext:error:] + 513,
10  CoreData                            0x00000001038fb4f3 __65-[NSPersistentStoreCoordinator executeRequest:withContext:error:]_block_invoke + 3331,
11  CoreData                            0x00000001039037ee gutsOfBlockToNSPersistentStoreCoordinatorPerform + 190,
12  libdispatch.dylib                   0x00000001056b17f4 _dispatch_client_callout + 8,
13  libdispatch.dylib                   0x0000000105698774 _dispatch_barrier_sync_f_invoke + 365,
14  CoreData                            0x00000001038f63d5 _perform + 197,
15  CoreData                            0x0000000103825ac8 -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 504,
16  CoreData                            0x0000000103878c80 -[NSManagedObjectContext(_NSInternalAdditions) _countWithNoChangesForRequest:error:] + 288,
17  CoreData                            0x000000010387868b -[NSManagedObjectContext countForFetchRequest:error:] + 331,

似乎与http://markmail.org/message/7cuuamyc4gcid5bb#query:+page:1+mid:h2t4o4moib3emltb+state:results有相似之处 enter image description here

可在此处查看示例项目:https://dl.dropboxusercontent.com/u/2935618/CustomObjectsInCoreData.zip

我有什么想法可以深究这个?非常感谢!

1 个答案:

答案 0 :(得分:0)

如果这些不是实体并且没有通过核心数据模型中的显式关系连接,那么使用SQL搜索NSPredicate中的对象似乎是不可能的。