所以，我搞砸了。我在 Xcode 中创建了现有 CoreData 模型的新版本，但不知何故从未最终提交 .xcdatamodel 文件(或更准确地说，是其中的 contents 文件)。现在，过了一会儿，该文件丢失了，我无法恢复它。尝试在 xcode 中打开 xcdatamodel 文件时出现错误“无法打开文件“内容”，因为没有这样的文件”。
我想我可以聪明一点，从以前版本的 .xcdatamodel 文件中复制 contents 文件，然后把我为这次迁移添加的表加回去(幸运的是，我只添加了一个表并生成了一个类，因此再次创建表很容易)。问题是，当我在模拟器或数据已存在的设备上运行该应用程序时，出现以下错误:Error Domain=NSCocoaErrorDomain Code=134130 "The operation couldn't be completed. (Cocoa error 134130. )”
该错误还列出了 NSPersistentStoreCoordinator 的当前模型哈希值，所以现在我假设所讨论模型的哈希值可能不同。
我在这里有哪些选择？我该如何修复数据，以便用户不必在更新前卸载应用并丢失所有数据？
错误的完整内容如下:
2015-01-21 11:01:11.050 Marq[2699:607] CoreData: annotation: Incompatible version schema for persistent store 'file:///Users/aerion/Library/Developer/CoreSimulator/Devices/71815540-57DE-49BF-A6F6-69500A54281F/data/Applications/EE5B15A6-A5ED-46EB-9DFD-B6B54353E35B/Documents/ARUPInspect_Schema.sqlite'. store metadata = {
NSPersistenceFrameworkVersion = 479;
NSStoreModelVersionHashes = {
Asset = <4b2b421f 4295c02f 89b5a2e8 1c4fc3e9 2b515eca 95e89ad6 e65c891d f82b1090>;
BooleanValue = <3e1758f6 0f04f670 5c150cd4 55f0a0eb b5c1a17e 8b1abdcc ab7044ba fd02dd5e>;
Client = <c52499f9 a0f482f7 9bdcb115 8217e157 1861f63a e926b55c e7cc85bb b4044464>;
DataValue = <43afe89a 90c53a31 4b839b5f b914896b 8ad165de dd46a159 6aac5f86 2d75058c>;
DataValueCollection = <78dce1b0 9f20a1a9 15004f99 65d71d00 46e7c949 80d599ea 622b2574 be9245a4>;
DateValue = <54571596 1267b4f2 5f14ee12 a0be1b3f 53d79056 7d612f33 e827b90e 7c4c847b>;
DirectoryItem = <b716a315 e40d91b6 18bb918e ab448086 48bc62b2 5a26e959 2c4a0cb4 8fc8d319>;
DirectoryNode = <c718b896 a2a90890 596409a2 c50240aa 1e5e347c f9d9c4df 1a5567fe 8bca7ed3>;
DoubleValue = <b63cba59 de2b200e 199c5ec4 ce17494a a8df75be bac353c0 3c5d9af7 fbf36240>;
Group = <0e912576 760d5fd4 df8a5bbe 13b7922d 6760a046 ea6fee68 3fcd4bd4 c9de7b3b>;
Inspection = <e7fc6688 bee2906d 8f8b7f5e 4f69d1da 59bdbb17 0a620529 c0abc426 d164a44f>;
InspectionMetaData = <982fe134 141245a4 97ca1cde aaa04843 90746c85 80ddedcc ed63b9a4 b3d40477>;
IntegerValue = <97fbd40d a463d4ed 282aa03b 4b5892fe 7fcac137 b4cc590b 03d79bb9 cfee4517>;
Observation = <651371ad be372494 10e31b83 509db973 6021af3b 79895e59 f38e0a9f 0b35a63e>;
ObservationGroup = <92f680bb b4b5243c 83b665e6 35e0d569 634aa24f 455de69e c8c3b666 84c6a858>;
Project = <97879f96 cdc99c88 6e6a614f aa81519b 2ba1f415 e4424a57 66d3f32e 3700829f>;
ProjectPreferredTemplate = <35381035 33dac226 aaeee194 fcd8ad4c e5c5506f a2c597ce 24ba7256 6f34f084>;
SchemaDataRepresentation = <c1843de9 2192b6f8 8f68d807 d5b0d2ac ab276b3c 67c48dc4 f363d92d 89ce1019>;
StringValue = <a7948007 c3454244 7cea0dcd c85b69b5 db5501fb 35e2a242 31907b97 558f1fb0>;
TemplateMetaData = <8f0702e9 8bbb5d4f 71c6a455 2a344af6 e967b2bb abcf05d3 96cd9ffc 328fe362>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "4512A0DB-E887-4294-9E75-840B9861ECA8";
"_NSAutoVacuumLevel" = 2;
} and current model versions = {
Asset = <4b2b421f 4295c02f 89b5a2e8 1c4fc3e9 2b515eca 95e89ad6 e65c891d f82b1090>;
BooleanValue = <3e1758f6 0f04f670 5c150cd4 55f0a0eb b5c1a17e 8b1abdcc ab7044ba fd02dd5e>;
Client = <c52499f9 a0f482f7 9bdcb115 8217e157 1861f63a e926b55c e7cc85bb b4044464>;
DataValue = <43afe89a 90c53a31 4b839b5f b914896b 8ad165de dd46a159 6aac5f86 2d75058c>;
DataValueCollection = <cb0da8d0 a2c307de 53600c9c 214dfeab bcefc9f0 0507f6e6 1b8ef683 ef608349>;
DateValue = <54571596 1267b4f2 5f14ee12 a0be1b3f 53d79056 7d612f33 e827b90e 7c4c847b>;
DirectoryItem = <b716a315 e40d91b6 18bb918e ab448086 48bc62b2 5a26e959 2c4a0cb4 8fc8d319>;
DirectoryNode = <b9da47a0 bdaf3956 5e75039f e3429a42 bf34d642 871c2f6d 7da7edfa f5380634>;
DoubleValue = <b63cba59 de2b200e 199c5ec4 ce17494a a8df75be bac353c0 3c5d9af7 fbf36240>;
Group = <0e912576 760d5fd4 df8a5bbe 13b7922d 6760a046 ea6fee68 3fcd4bd4 c9de7b3b>;
Inspection = <e7fc6688 bee2906d 8f8b7f5e 4f69d1da 59bdbb17 0a620529 c0abc426 d164a44f>;
InspectionMetaData = <982fe134 141245a4 97ca1cde aaa04843 90746c85 80ddedcc ed63b9a4 b3d40477>;
IntegerValue = <97fbd40d a463d4ed 282aa03b 4b5892fe 7fcac137 b4cc590b 03d79bb9 cfee4517>;
Observation = <651371ad be372494 10e31b83 509db973 6021af3b 79895e59 f38e0a9f 0b35a63e>;
ObservationGroup = <92f680bb b4b5243c 83b665e6 35e0d569 634aa24f 455de69e c8c3b666 84c6a858>;
Project = <97879f96 cdc99c88 6e6a614f aa81519b 2ba1f415 e4424a57 66d3f32e 3700829f>;
ProjectPreferredTemplate = <35381035 33dac226 aaeee194 fcd8ad4c e5c5506f a2c597ce 24ba7256 6f34f084>;
SchemaDataRepresentation = <c1843de9 2192b6f8 8f68d807 d5b0d2ac ab276b3c 67c48dc4 f363d92d 89ce1019>;
StringValue = <a7948007 c3454244 7cea0dcd c85b69b5 db5501fb 35e2a242 31907b97 558f1fb0>;
TemplateMetaData = <8f0702e9 8bbb5d4f 71c6a455 2a344af6 e967b2bb abcf05d3 96cd9ffc 328fe362>;
}
2015-01-21 11:01:11.055 Marq[2699:607] CoreData: annotation: (migration) will attempt automatic schema migration
2015-01-21 11:01:11.335 Marq[2699:607] CoreData: error: (migration) migration failed with error Error Domain=NSCocoaErrorDomain Code=134130 "The operation couldn’t be completed. (Cocoa error 134130.)" UserInfo=0x6b58f220 {URL=file:///Users/aerion/Library/Developer/CoreSimulator/Devices/71815540-57DE-49BF-A6F6-69500A54281F/data/Applications/EE5B15A6-A5ED-46EB-9DFD-B6B54353E35B/Documents/ARUPInspect_Schema.sqlite, metadata={
NSPersistenceFrameworkVersion = 479;
NSStoreModelVersionHashes = {
Asset = <4b2b421f 4295c02f 89b5a2e8 1c4fc3e9 2b515eca 95e89ad6 e65c891d f82b1090>;
BooleanValue = <3e1758f6 0f04f670 5c150cd4 55f0a0eb b5c1a17e 8b1abdcc ab7044ba fd02dd5e>;
Client = <c52499f9 a0f482f7 9bdcb115 8217e157 1861f63a e926b55c e7cc85bb b4044464>;
DataValue = <43afe89a 90c53a31 4b839b5f b914896b 8ad165de dd46a159 6aac5f86 2d75058c>;
DataValueCollection = <78dce1b0 9f20a1a9 15004f99 65d71d00 46e7c949 80d599ea 622b2574 be9245a4>;
DateValue = <54571596 1267b4f2 5f14ee12 a0be1b3f 53d79056 7d612f33 e827b90e 7c4c847b>;
DirectoryItem = <b716a315 e40d91b6 18bb918e ab448086 48bc62b2 5a26e959 2c4a0cb4 8fc8d319>;
DirectoryNode = <c718b896 a2a90890 596409a2 c50240aa 1e5e347c f9d9c4df 1a5567fe 8bca7ed3>;
DoubleValue = <b63cba59 de2b200e 199c5ec4 ce17494a a8df75be bac353c0 3c5d9af7 fbf36240>;
Group = <0e912576 760d5fd4 df8a5bbe 13b7922d 6760a046 ea6fee68 3fcd4bd4 c9de7b3b>;
Inspection = <e7fc6688 bee2906d 8f8b7f5e 4f69d1da 59bdbb17 0a620529 c0abc426 d164a44f>;
InspectionMetaData = <982fe134 141245a4 97ca1cde aaa04843 90746c85 80ddedcc ed63b9a4 b3d40477>;
IntegerValue = <97fbd40d a463d4ed 282aa03b 4b5892fe 7fcac137 b4cc590b 03d79bb9 cfee4517>;
Observation = <651371ad be372494 10e31b83 509db973 6021af3b 79895e59 f38e0a9f 0b35a63e>;
ObservationGroup = <92f680bb b4b5243c 83b665e6 35e0d569 634aa24f 455de69e c8c3b666 84c6a858>;
Project = <97879f96 cdc99c88 6e6a614f aa81519b 2ba1f415 e4424a57 66d3f32e 3700829f>;
ProjectPreferredTemplate = <35381035 33dac226 aaeee194 fcd8ad4c e5c5506f a2c597ce 24ba7256 6f34f084>;
SchemaDataRepresentation = <c1843de9 2192b6f8 8f68d807 d5b0d2ac ab276b3c 67c48dc4 f363d92d 89ce1019>;
StringValue = <a7948007 c3454244 7cea0dcd c85b69b5 db5501fb 35e2a242 31907b97 558f1fb0>;
TemplateMetaData = <8f0702e9 8bbb5d4f 71c6a455 2a344af6 e967b2bb abcf05d3 96cd9ffc 328fe362>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "4512A0DB-E887-4294-9E75-840B9861ECA8";
"_NSAutoVacuumLevel" = 2;
}, reason=Can't find model for source store}
Error User Info: {
URL = "file:///Users/aerion/Library/Developer/CoreSimulator/Devices/71815540-57DE-49BF-A6F6-69500A54281F/data/Applications/EE5B15A6-A5ED-46EB-9DFD-B6B54353E35B/Documents/ARUPInspect_Schema.sqlite";
metadata = {
NSPersistenceFrameworkVersion = 479;
NSStoreModelVersionHashes = {
Asset = <4b2b421f 4295c02f 89b5a2e8 1c4fc3e9 2b515eca 95e89ad6 e65c891d f82b1090>;
BooleanValue = <3e1758f6 0f04f670 5c150cd4 55f0a0eb b5c1a17e 8b1abdcc ab7044ba fd02dd5e>;
Client = <c52499f9 a0f482f7 9bdcb115 8217e157 1861f63a e926b55c e7cc85bb b4044464>;
DataValue = <43afe89a 90c53a31 4b839b5f b914896b 8ad165de dd46a159 6aac5f86 2d75058c>;
DataValueCollection = <78dce1b0 9f20a1a9 15004f99 65d71d00 46e7c949 80d599ea 622b2574 be9245a4>;
DateValue = <54571596 1267b4f2 5f14ee12 a0be1b3f 53d79056 7d612f33 e827b90e 7c4c847b>;
DirectoryItem = <b716a315 e40d91b6 18bb918e ab448086 48bc62b2 5a26e959 2c4a0cb4 8fc8d319>;
DirectoryNode = <c718b896 a2a90890 596409a2 c50240aa 1e5e347c f9d9c4df 1a5567fe 8bca7ed3>;
DoubleValue = <b63cba59 de2b200e 199c5ec4 ce17494a a8df75be bac353c0 3c5d9af7 fbf36240>;
Group = <0e912576 760d5fd4 df8a5bbe 13b7922d 6760a046 ea6fee68 3fcd4bd4 c9de7b3b>;
Inspection = <e7fc6688 bee2906d 8f8b7f5e 4f69d1da 59bdbb17 0a620529 c0abc426 d164a44f>;
InspectionMetaData = <982fe134 141245a4 97ca1cde aaa04843 90746c85 80ddedcc ed63b9a4 b3d40477>;
IntegerValue = <97fbd40d a463d4ed 282aa03b 4b5892fe 7fcac137 b4cc590b 03d79bb9 cfee4517>;
Observation = <651371ad be372494 10e31b83 509db973 6021af3b 79895e59 f38e0a9f 0b35a63e>;
ObservationGroup = <92f680bb b4b5243c 83b665e6 35e0d569 634aa24f 455de69e c8c3b666 84c6a858>;
Project = <97879f96 cdc99c88 6e6a614f aa81519b 2ba1f415 e4424a57 66d3f32e 3700829f>;
ProjectPreferredTemplate = <35381035 33dac226 aaeee194 fcd8ad4c e5c5506f a2c597ce 24ba7256 6f34f084>;
SchemaDataRepresentation = <c1843de9 2192b6f8 8f68d807 d5b0d2ac ab276b3c 67c48dc4 f363d92d 89ce1019>;
StringValue = <a7948007 c3454244 7cea0dcd c85b69b5 db5501fb 35e2a242 31907b97 558f1fb0>;
TemplateMetaData = <8f0702e9 8bbb5d4f 71c6a455 2a344af6 e967b2bb abcf05d3 96cd9ffc 328fe362>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "4512A0DB-E887-4294-9E75-840B9861ECA8";
"_NSAutoVacuumLevel" = 2;
};
reason = "Can't find model for source store";
}
2015-01-21 11:01:11.340 Marq[2699:607] -[AISDataService persistentStoreCoordinator] line 1410 $ Unresolved error Error Domain=NSCocoaErrorDomain Code=134130 "The operation couldn’t be completed. (Cocoa error 134130.)" UserInfo=0x6b58f220 {URL=file:///Users/aerion/Library/Developer/CoreSimulator/Devices/71815540-57DE-49BF-A6F6-69500A54281F/data/Applications/EE5B15A6-A5ED-46EB-9DFD-B6B54353E35B/Documents/ARUPInspect_Schema.sqlite, metadata={
NSPersistenceFrameworkVersion = 479;
NSStoreModelVersionHashes = {
Asset = <4b2b421f 4295c02f 89b5a2e8 1c4fc3e9 2b515eca 95e89ad6 e65c891d f82b1090>;
BooleanValue = <3e1758f6 0f04f670 5c150cd4 55f0a0eb b5c1a17e 8b1abdcc ab7044ba fd02dd5e>;
Client = <c52499f9 a0f482f7 9bdcb115 8217e157 1861f63a e926b55c e7cc85bb b4044464>;
DataValue = <43afe89a 90c53a31 4b839b5f b914896b 8ad165de dd46a159 6aac5f86 2d75058c>;
DataValueCollection = <78dce1b0 9f20a1a9 15004f99 65d71d00 46e7c949 80d599ea 622b2574 be9245a4>;
DateValue = <54571596 1267b4f2 5f14ee12 a0be1b3f 53d79056 7d612f33 e827b90e 7c4c847b>;
DirectoryItem = <b716a315 e40d91b6 18bb918e ab448086 48bc62b2 5a26e959 2c4a0cb4 8fc8d319>;
DirectoryNode = <c718b896 a2a90890 596409a2 c50240aa 1e5e347c f9d9c4df 1a5567fe 8bca7ed3>;
DoubleValue = <b63cba59 de2b200e 199c5ec4 ce17494a a8df75be bac353c0 3c5d9af7 fbf36240>;
Group = <0e912576 760d5fd4 df8a5bbe 13b7922d 6760a046 ea6fee68 3fcd4bd4 c9de7b3b>;
Inspection = <e7fc6688 bee2906d 8f8b7f5e 4f69d1da 59bdbb17 0a620529 c0abc426 d164a44f>;
InspectionMetaData = <982fe134 141245a4 97ca1cde aaa04843 90746c85 80ddedcc ed63b9a4 b3d40477>;
IntegerValue = <97fbd40d a463d4ed 282aa03b 4b5892fe 7fcac137 b4cc590b 03d79bb9 cfee4517>;
Observation = <651371ad be372494 10e31b83 509db973 6021af3b 79895e59 f38e0a9f 0b35a63e>;
ObservationGroup = <92f680bb b4b5243c 83b665e6 35e0d569 634aa24f 455de69e c8c3b666 84c6a858>;
Project = <97879f96 cdc99c88 6e6a614f aa81519b 2ba1f415 e4424a57 66d3f32e 3700829f>;
ProjectPreferredTemplate = <35381035 33dac226 aaeee194 fcd8ad4c e5c5506f a2c597ce 24ba7256 6f34f084>;
SchemaDataRepresentation = <c1843de9 2192b6f8 8f68d807 d5b0d2ac ab276b3c 67c48dc4 f363d92d 89ce1019>;
StringValue = <a7948007 c3454244 7cea0dcd c85b69b5 db5501fb 35e2a242 31907b97 558f1fb0>;
TemplateMetaData = <8f0702e9 8bbb5d4f 71c6a455 2a344af6 e967b2bb abcf05d3 96cd9ffc 328fe362>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "4512A0DB-E887-4294-9E75-840B9861ECA8";
"_NSAutoVacuumLevel" = 2;
}, reason=Can't find model for source store}, {
URL = "file:///Users/aerion/Library/Developer/CoreSimulator/Devices/71815540-57DE-49BF-A6F6-69500A54281F/data/Applications/EE5B15A6-A5ED-46EB-9DFD-B6B54353E35B/Documents/ARUPInspect_Schema.sqlite";
metadata = {
NSPersistenceFrameworkVersion = 479;
NSStoreModelVersionHashes = {
Asset = <4b2b421f 4295c02f 89b5a2e8 1c4fc3e9 2b515eca 95e89ad6 e65c891d f82b1090>;
BooleanValue = <3e1758f6 0f04f670 5c150cd4 55f0a0eb b5c1a17e 8b1abdcc ab7044ba fd02dd5e>;
Client = <c52499f9 a0f482f7 9bdcb115 8217e157 1861f63a e926b55c e7cc85bb b4044464>;
DataValue = <43afe89a 90c53a31 4b839b5f b914896b 8ad165de dd46a159 6aac5f86 2d75058c>;
DataValueCollection = <78dce1b0 9f20a1a9 15004f99 65d71d00 46e7c949 80d599ea 622b2574 be9245a4>;
DateValue = <54571596 1267b4f2 5f14ee12 a0be1b3f 53d79056 7d612f33 e827b90e 7c4c847b>;
DirectoryItem = <b716a315 e40d91b6 18bb918e ab448086 48bc62b2 5a26e959 2c4a0cb4 8fc8d319>;
DirectoryNode = <c718b896 a2a90890 596409a2 c50240aa 1e5e347c f9d9c4df 1a5567fe 8bca7ed3>;
DoubleValue = <b63cba59 de2b200e 199c5ec4 ce17494a a8df75be bac353c0 3c5d9af7 fbf36240>;
Group = <0e912576 760d5fd4 df8a5bbe 13b7922d 6760a046 ea6fee68 3fcd4bd4 c9de7b3b>;
Inspection = <e7fc6688 bee2906d 8f8b7f5e 4f69d1da 59bdbb17 0a620529 c0abc426 d164a44f>;
InspectionMetaData = <982fe134 141245a4 97ca1cde aaa04843 90746c85 80ddedcc ed63b9a4 b3d40477>;
IntegerValue = <97fbd40d a463d4ed 282aa03b 4b5892fe 7fcac137 b4cc590b 03d79bb9 cfee4517>;
Observation = <651371ad be372494 10e31b83 509db973 6021af3b 79895e59 f38e0a9f 0b35a63e>;
ObservationGroup = <92f680bb b4b5243c 83b665e6 35e0d569 634aa24f 455de69e c8c3b666 84c6a858>;
Project = <97879f96 cdc99c88 6e6a614f aa81519b 2ba1f415 e4424a57 66d3f32e 3700829f>;
ProjectPreferredTemplate = <35381035 33dac226 aaeee194 fcd8ad4c e5c5506f a2c597ce 24ba7256 6f34f084>;
SchemaDataRepresentation = <c1843de9 2192b6f8 8f68d807 d5b0d2ac ab276b3c 67c48dc4 f363d92d 89ce1019>;
StringValue = <a7948007 c3454244 7cea0dcd c85b69b5 db5501fb 35e2a242 31907b97 558f1fb0>;
TemplateMetaData = <8f0702e9 8bbb5d4f 71c6a455 2a344af6 e967b2bb abcf05d3 96cd9ffc 328fe362>;
};
NSStoreModelVersionHashesVersion = 3;
NSStoreModelVersionIdentifiers = (
""
);
NSStoreType = SQLite;
NSStoreUUID = "4512A0DB-E887-4294-9E75-840B9861ECA8";
"_NSAutoVacuumLevel" = 2;
};
reason = "Can't find model for source store";
}
最佳答案
您在尝试重新创建丢失的版本时遇到的错误几乎可以肯定是因为您没有以完全相同的方式重新创建它。如果您不确定，最简单的方法就是再试一次。如果您创建的新版本与旧版本完全匹配，那么它没有理由不工作。
如果您不能这样做，您可以使用以下方法从应用的应用商店副本恢复模型:
如果您从 Xcode 归档文件(.xcarchive)开始，那只是一个包含应用程序包和一些其他内容的文件包。浏览它以找到包含 所有 核心数据模型的 momd，然后查看该包内部以找到与您缺少的版本匹配的单个 mom .将该文件复制到存档之外的某处。
如果您从 ipa 开始，那只是一个包含该应用程序的 zip 文件。使用您喜欢的任何解压缩工具将其解压缩，然后按照上述步骤找到正确的 mom。
mom文件是编译后的模型，但与源代码不同的是，模型编译是可以逆向的。在 Xcode 中创建一个新的模型版本并删除其中的所有内容，使其完全为空。然后转到编辑器菜单并选择导入...。导入您在上面找到的 mom 文件。
你现在应该有一个 Core Data 模型版本，它与你的应用中的编译模型完全对应。 将其提交到您的源代码存储库，以便下次使用。
关于ios - 如何恢复丢失的 CoreData 模型版本？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28037593/
我正在学习如何使用Nokogiri，根据这段代码我遇到了一些问题:require'rubygems'require'mechanize'post_agent=WWW::Mechanize.newpost_page=post_agent.get('http://www.vbulletin.org/forum/showthread.php?t=230708')puts"\nabsolutepathwithtbodygivesnil"putspost_page.parser.xpath('/html/body/div/div/div/div/div/table/tbody/tr/td/div
总的来说，我对ruby还比较陌生，我正在为我正在创建的对象编写一些rspec测试用例。许多测试用例都非常基础，我只是想确保正确填充和返回值。我想知道是否有办法使用循环结构来执行此操作。不必为我要测试的每个方法都设置一个assertEquals。例如:describeitem,"TestingtheItem"doit"willhaveanullvaluetostart"doitem=Item.new#HereIcoulddotheitem.name.shouldbe_nil#thenIcoulddoitem.category.shouldbe_nilendend但我想要一些方法来使用
关闭。这个问题是opinion-based.它目前不接受答案。想要改进这个问题？更新问题，以便editingthispost可以用事实和引用来回答它.关闭4年前。Improvethisquestion我想在固定时间创建一系列低音和高音调的哔哔声。例如:在150毫秒时发出高音调的蜂鸣声在151毫秒时发出低音调的蜂鸣声200毫秒时发出低音调的蜂鸣声250毫秒的高音调蜂鸣声有没有办法在Ruby或Python中做到这一点？我真的不在乎输出编码是什么(.wav、.mp3、.ogg等等)，但我确实想创建一个输出文件。
给定这段代码defcreate@upgrades=User.update_all(["role=?","upgraded"],:id=>params[:upgrade])redirect_toadmin_upgrades_path,:notice=>"Successfullyupgradeduser."end我如何在该操作中实际验证它们是否已保存或未重定向到适当的页面和消息？ 最佳答案 在Rails3中，update_all不返回任何有意义的信息，除了已更新的记录数(这可能取决于您的DBMS是否返回该信息)。http://ar.ru
我有一个模型:classItem项目有一个属性“商店”基于存储的值，我希望Item对象对特定方法具有不同的行为。Rails中是否有针对此的通用设计模式？如果方法中没有大的if-else语句，这是如何干净利落地完成的？ 最佳答案 通常通过Single-TableInheritance. 关于ruby-on-rails-Rails-子类化模型的设计模式是什么？，我们在StackOverflow上找到一个类似的问题： https://stackoverflow.co
我在我的项目目录中完成了compasscreate.和compassinitrails。几个问题:我已将我的.sass文件放在public/stylesheets中。这是放置它们的正确位置吗？当我运行compasswatch时，它不会自动编译这些.sass文件。我必须手动指定文件:compasswatchpublic/stylesheets/myfile.sass等。如何让它自动运行？文件ie.css、print.css和screen.css已放在stylesheets/compiled。如何在编译后不让它们重新出现的情况下删除它们？我自己编译的.sass文件编译成compiled/t
我正在寻找执行以下操作的正确语法(在Perl、Shell或Ruby中):#variabletoaccessthedatalinesappendedasafileEND_OF_SCRIPT_MARKERrawdatastartshereanditcontinues. 最佳答案 Perl用__DATA__做这个:#!/usr/bin/perlusestrict;usewarnings;while(){print;}__DATA__Texttoprintgoeshere 关于ruby-如何将脚
Rackup通过Rack的默认处理程序成功运行任何Rack应用程序。例如:classRackAppdefcall(environment)['200',{'Content-Type'=>'text/html'},["Helloworld"]]endendrunRackApp.new但是当最后一行更改为使用Rack的内置CGI处理程序时，rackup给出“NoMethodErrorat/undefinedmethod`call'fornil:NilClass”:Rack::Handler::CGI.runRackApp.newRack的其他内置处理程序也提出了同样的反对意见。例如Rack
我需要从一个View访问多个模型。以前，我的links_controller仅用于提供以不同方式排序的链接资源。现在我想包括一个部分(我假设)显示按分数排序的顶级用户(@users=User.all.sort_by(&:score))我知道我可以将此代码插入每个链接操作并从View访问它，但这似乎不是“ruby方式”，我将需要在不久的将来访问更多模型。这可能会变得很脏，是否有针对这种情况的任何技术？注意事项:我认为我的应用程序正朝着单一格式和动态页面内容的方向发展，本质上是一个典型的网络应用程序。我知道before_filter但考虑到我希望应用程序进入的方向，这似乎很麻烦。最终从任何
在选择我想要运行操作的频率时，唯一的选项是“每天”、“每小时”和“每10分钟”。谢谢!我想为我的Rails3.1应用程序运行调度程序。 最佳答案 这不是一个优雅的解决方案，但您可以安排它每天运行，并在实际开始工作之前检查日期是否为当月的第一天。 关于ruby-如何每月在Heroku运行一次Scheduler插件？，我们在StackOverflow上找到一个类似的问题： https://stackoverflow.com/questions/8692687/