我正在尝试从第二版数据库中加载数据。所以我试图从版本 A 加载数据，我有一个从 A->B 到 B->C 的映射模型。
这是行不通的。我不确定为什么。我可以从日志中看到它看到所有具有正确 UUID 的映射模型，它只是不会跳转到运行这两个映射模型。附上日志。
2013-11-06 16:49:14.751 DigimarcDiscover[4691:1603] CoreData: annotation: Incompatible version schema for persistent store 'file:///var/mobile/Applications/706DD1D2-E136-4028-9F3A-97C888CC1CD1/Library/Application%20Support/History.db'. store metadata = {
NSPersistenceFrameworkVersion = 481;
NSStoreModelVersionHashes = {
BarcodeHistoryItem = <ad40b955 0fdcbf91 efd12f35 5ab2737a ad57635a 7b9bd32a a4aaecaf 6eb6ffb0>;
HistoryItem = <8be6112c 2517affe 7496c522 c267a485 1b002285 057a735b d38e79c1 b2700406>;
MusicHistoryItem = <180e1207 9c41a970 bcd190bb 33b1d55e f4f6fe93 99167a2c c5b9aadd add4281e>;
WatermarkHistoryItem = <a55bab71 2e03c10f 6f59c567 64bd48c3 bed015c8 05ed9cbf a3253b44 02a9c783>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "B2C6A3EE-A000-4641-A2EC-8F30FFD66F92";
"_NSAutoVacuumLevel" = 2;
} and current model versions = {
Artwork = <952d1ac4 6e13d942 c50b66d3 87b0abac 48a443ac c39a5600 4c2dd9fb d3628c39>;
BarcodeHistoryItem = <b0f8ac5f 1b88e0bd 02c58aa0 318c6528 d4a2d875 e1cb2a0e 0f7a97a3 cbabf8df>;
HistoryItem = <816029f3 a3d5291f 118de2b3 0522e405 8dc8e24b 7bcc12e4 c76aaa4f 5ac819db>;
MusicHistoryItem = <2845a594 da975d6f 01cb8c22 439446cd 88b3749c 3efbc146 cd081387 0fc7b151>;
ThumbnailItem = <97e6c0c6 0eea0170 3870ca94 348d8ff8 437fc4ca ce8e11c1 1623ff07 5ea78ad4>;
WatermarkHistoryItem = <c65a4768 ddae03fd 870a3136 0a3ccd77 000776b7 b14d4354 d4ac1126 65473d1a>;
}
2013-11-06 16:49:14.760 DigimarcDiscover[4691:1603] CoreData: annotation: (migration) will attempt automatic schema migration
2013-11-06 16:49:15.072 DigimarcDiscover[4691:1603] CoreData: annotation: (migration) looking for mapping model with
source hashes:
{
BarcodeHistoryItem = <ad40b955 0fdcbf91 efd12f35 5ab2737a ad57635a 7b9bd32a a4aaecaf 6eb6ffb0>;
HistoryItem = <8be6112c 2517affe 7496c522 c267a485 1b002285 057a735b d38e79c1 b2700406>;
MusicHistoryItem = <180e1207 9c41a970 bcd190bb 33b1d55e f4f6fe93 99167a2c c5b9aadd add4281e>;
WatermarkHistoryItem = <a55bab71 2e03c10f 6f59c567 64bd48c3 bed015c8 05ed9cbf a3253b44 02a9c783>;
}
destination hashes: {
Artwork = <952d1ac4 6e13d942 c50b66d3 87b0abac 48a443ac c39a5600 4c2dd9fb d3628c39>;
BarcodeHistoryItem = <b0f8ac5f 1b88e0bd 02c58aa0 318c6528 d4a2d875 e1cb2a0e 0f7a97a3 cbabf8df>;
HistoryItem = <816029f3 a3d5291f 118de2b3 0522e405 8dc8e24b 7bcc12e4 c76aaa4f 5ac819db>;
MusicHistoryItem = <2845a594 da975d6f 01cb8c22 439446cd 88b3749c 3efbc146 cd081387 0fc7b151>;
ThumbnailItem = <97e6c0c6 0eea0170 3870ca94 348d8ff8 437fc4ca ce8e11c1 1623ff07 5ea78ad4>;
WatermarkHistoryItem = <c65a4768 ddae03fd 870a3136 0a3ccd77 000776b7 b14d4354 d4ac1126 65473d1a>;
}
2013-11-06 16:49:15.085 DigimarcDiscover[4691:1603] CoreData: annotation: (migration) checking mapping model /var/mobile/Applications/706DD1D2-E136-4028-9F3A-97C888CC1CD1/DigimarcDiscover.app/MappingModel.cdm
source hashes:
{(
<8be6112c 2517affe 7496c522 c267a485 1b002285 057a735b d38e79c1 b2700406>,
<ad40b955 0fdcbf91 efd12f35 5ab2737a ad57635a 7b9bd32a a4aaecaf 6eb6ffb0>,
<a55bab71 2e03c10f 6f59c567 64bd48c3 bed015c8 05ed9cbf a3253b44 02a9c783>,
<180e1207 9c41a970 bcd190bb 33b1d55e f4f6fe93 99167a2c c5b9aadd add4281e>
)}
destination hashes: {(
<952d1ac4 6e13d942 c50b66d3 87b0abac 48a443ac c39a5600 4c2dd9fb d3628c39>,
<b0f8ac5f 1b88e0bd 02c58aa0 318c6528 d4a2d875 e1cb2a0e 0f7a97a3 cbabf8df>,
<816029f3 a3d5291f 118de2b3 0522e405 8dc8e24b 7bcc12e4 c76aaa4f 5ac819db>,
<2845a594 da975d6f 01cb8c22 439446cd 88b3749c 3efbc146 cd081387 0fc7b151>,
<97e6c0c6 0eea0170 3870ca94 348d8ff8 437fc4ca ce8e11c1 1623ff07 5ea78ad4>,
<cf2033c8 0fc04c69 6a905095 bb8d3f2e 20775b82 66cdf0bf b33cc93c ea42d214>
)}
2013-11-06 16:49:15.090 DigimarcDiscover[4691:1603] CoreData: annotation: (migration) mismatched and destination hashes for mapping model MappingModel.cdm
2013-11-06 16:49:15.091 DigimarcDiscover[4691:1603] CoreData: annotation: (migration) no match found for 1 of 6 mapping model destination hashes
2013-11-06 16:49:15.103 DigimarcDiscover[4691:1603] CoreData: annotation: (migration) checking mapping model /var/mobile/Applications/706DD1D2-E136-4028-9F3A-97C888CC1CD1/DigimarcDiscover.app/MappingModel40to50.cdm
source hashes:
{(
<952d1ac4 6e13d942 c50b66d3 87b0abac 48a443ac c39a5600 4c2dd9fb d3628c39>,
<b0f8ac5f 1b88e0bd 02c58aa0 318c6528 d4a2d875 e1cb2a0e 0f7a97a3 cbabf8df>,
<cf2033c8 0fc04c69 6a905095 bb8d3f2e 20775b82 66cdf0bf b33cc93c ea42d214>,
<2845a594 da975d6f 01cb8c22 439446cd 88b3749c 3efbc146 cd081387 0fc7b151>,
<97e6c0c6 0eea0170 3870ca94 348d8ff8 437fc4ca ce8e11c1 1623ff07 5ea78ad4>,
<816029f3 a3d5291f 118de2b3 0522e405 8dc8e24b 7bcc12e4 c76aaa4f 5ac819db>
)}
destination hashes: {(
<952d1ac4 6e13d942 c50b66d3 87b0abac 48a443ac c39a5600 4c2dd9fb d3628c39>,
<b0f8ac5f 1b88e0bd 02c58aa0 318c6528 d4a2d875 e1cb2a0e 0f7a97a3 cbabf8df>,
<816029f3 a3d5291f 118de2b3 0522e405 8dc8e24b 7bcc12e4 c76aaa4f 5ac819db>,
<c65a4768 ddae03fd 870a3136 0a3ccd77 000776b7 b14d4354 d4ac1126 65473d1a>,
<2845a594 da975d6f 01cb8c22 439446cd 88b3749c 3efbc146 cd081387 0fc7b151>,
<97e6c0c6 0eea0170 3870ca94 348d8ff8 437fc4ca ce8e11c1 1623ff07 5ea78ad4>
)}
2013-11-06 16:49:15.105 DigimarcDiscover[4691:1603] CoreData: annotation: (migration) mismatched source and hashes for mapping model MappingModel40to50.cdm
2013-11-06 16:49:15.109 DigimarcDiscover[4691:1603] CoreData: annotation: (migration) no suitable mapping model found