这是一个非常奇怪的错误。网络上的建议是,这可能是针对Tiger版本的问题;但实际上我是在针对iOS 3和4进行开发。
Error Domain=NSCocoaErrorDomain Code=134020 "The operation couldn\u2019t be completed. (Cocoa error 134020.)" UserInfo=0xc502350 {NSAffectedObjectsErrorKey=<PartRecommendation: 0x6a113e0> (entity: PartRecommendation; id: 0x6a0d0e0 <x-coredata:///PartRecommendation/tAE2B5BA2-44FD-4B62-95D7-5B86EBD6830014> ; data: {
"_rkManagedObjectSyncStatus" = 0;
name = "Thin canopy cover";
part = nil;
partRecommendationId = 6;
partType = "0x6a07f40 <x-coredata:///PartType/tAE2B5BA2-44FD-4B62-95D7-5B86EBD683003>";
}), NSUnderlyingException=Store <NSSQLCore: 0x5f3b4c0> cannot hold instances of entity (<NSEntityDescription: 0x6d2e5d0>) name PartRecommendation, managedObjectClassName PartRecommendation, renamingIdentifier PartRecommendation, isAbstract 0, superentity name PartOption, properties {
"_rkManagedObjectSyncStatus" = "(<NSAttributeDescription: 0x6d37550>), name _rkManagedObjectSyncStatus, isOptional 0, isTransient 0, entity PartRecommendation, renamingIdentifier _rkManagedObjectSyncStatus, validation predicates (\n), warnings (\n), versionHashModifier (null), attributeType 100 , attributeValueClassName NSNumber, defaultValue 0";
name = "(<NSAttributeDescription: 0x6d37c10>), name name, isOptional 1, isTransient 0, entity PartRecommendation, renamingIdentifier name, validation predicates (\n), warnings (\n), versionHashModifier (null), attributeType 700 , attributeValueClassName NSString, defaultValue (null)";
part = "(<NSRelationshipDescription: 0x6d2e660>), name part, isOptional 1, isTransient 0, entity PartRecommendation, renamingIdentifier part, validation predicates (\n), warnings (\n), versionHashModifier (null), destination entity Part, inverseRelationship recommendation, minCount 1, maxCount 1";
partRecommendationId = "(<NSAttributeDescription: 0x6d2e6d0>), name partRecommendationId, isOptional 1, isTransient 0, entity PartRecommendation, renamingIdentifier partRecommendationId, validation predicates (\n), warnings (\n), versionHashModifier (null), attributeType 100 , attributeValueClassName NSNumber, defaultValue 0";
partType = "(<NSRelationshipDescription: 0x6d2e720>), name partType, isOptional 1, isTransient 0, entity PartRecommendation, renamingIdentifier partType, validation predicates (\n), warnings (\n), versionHashModifier (null), destination entity PartType, inverseRelationship partRecommendations, minCount 1, maxCount 1";
}, subentities {
}, userInfo {
}, versionHashModifier (null)}
在我遇到这个错误之前,我向Core Data添加了大量数据,但我进行了两次保存(一次在中途,然后再次在最后)。第一次保存后一切正常,是第二次保存导致了问题,因此我将发布我在第一次保存之后但在第二次保存之前使用的代码。
Landscape *landscape = [Landscape object];
Type *type = [Type object];
type.name = @"tree";
MeasurementType *caliperType = [MeasurementType object];
MeasurementType *heightType = [MeasurementType object];
InventoryTree *inventoryTree = [InventoryTree object];
inventoryTree.landscape = landscape;
inventoryTree.type = type;
Assessment *assessmentTree = [Assessment object];
assessmentTree.inventoryItem = inventoryTree;
assessmentTree.type = type;
[[inventoryTree mutableSetValueForKeyPath:@"assessments"] addObject:assessmentTree];
Measurement *caliper = [Measurement object];
Measurement *height = [Measurement object];
caliper.type = caliperType;
height.type = heightType;
[[assessmentTree mutableSetValueForKey:@"measurements"] addObjectsFromArray:[NSArray arrayWithObjects:caliper, height, nil]];
for (PartType *pType in [PartType allObjects]) {
pType.type = type;
Part *treePart = [Part object];
treePart.partType = pType;
[[assessmentTree mutableSetValueForKey:@"parts"] addObject:treePart];
for (PartCondition *cond in pType.partConditions) {
cond.partType = pType;
}
for (PartRecommendation *rec in pType.partRecommendations) {
rec.partType = pType;
}
}
我正在调用NSManagedObject子类上的便捷方法,可以在这里找到。
我在应用程序的其他地方有一些方法(长时间运行后),可以添加/编辑/删除上述引用的所有实体。错误不会每次都发生在同一个实体上。
非常感谢您的帮助!这是一个棘手的问题。