My app has the option to create several unique events whose values are saved in core data. When the table cell is pressed it loads the values of that event. What I need is to be able to export only that event information to NSData which can be exported then imported through a custom UTI. The code below works except it loads ALL events and exports the data. How can I make it so only the index path selected, with it's saved values, is exported and not all events in the entity?
-(void)exportclick:(UIButton *)sender
{
mainview.hidden = YES;
NSInteger index = exportevent.tag;
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];
NSManagedObject *rawRecord = [self.fetchedResultsController objectAtIndexPath:indexPath];
TSPItem *record = [TSPItem castObject:rawRecord];
CDSurveyItem *surveyItem = [CDSurveyItem castObject:rawRecord];
[self setSelection:indexPath];
NSString *eventName = nil;
if (record.eventname) {
eventName = record.eventname;
}
else if (surveyItem.eventname) {
eventName = surveyItem.eventname;
}
[self setSelection:indexPath];
if (self.selection)
{
[self exportContext:self.managedObjectContext objectmodel:record];
}
}
- (void)exportContext:(NSManagedObjectContext *)context objectmodel:(NSManagedObject *)object {
NSPersistentStoreCoordinator *coordinator = context.persistentStoreCoordinator;
NSManagedObjectModel *model = coordinator.managedObjectModel;
NSArray *entitites = [model entities];
NSMutableDictionary *data = [NSMutableDictionary dictionaryWithCapacity:[entitites count]];
for(NSEntityDescription *entity in entitites) {
@autoreleasepool {
NSArray *properties = [entity properties];
NSArray *allObjects = ({
NSFetchRequest *fetchReq = [NSFetchRequest fetchRequestWithEntityName:[entity name]];
fetchReq.includesSubentities = NO; // important
[context executeFetchRequest:fetchReq error:nil];
});
NSMutableArray *items = [NSMutableArray arrayWithCapacity:[allObjects count]];
for(object in allObjects) {
NSMutableDictionary *attrs = [NSMutableDictionary dictionaryWithCapacity:[entity.attributesByName count]];
NSMutableDictionary *relations = [NSMutableDictionary dictionaryWithCapacity:[entity.relationshipsByName count]];
for(NSPropertyDescription *property in properties) {
// attributes
if([property isKindOfClass:[NSAttributeDescription class]]) {
// types that can be directly represented in JSON
NSAttributeType attrType = [(NSAttributeDescription *)property attributeType];
id val = [object valueForKey:[property name]];
if(val == nil)
[attrs setValue:[NSNull null] forKey:[property name]];
else if(attrType < NSDateAttributeType) {
[attrs setValue:val forKey:[property name]];
}
else {
if(attrType == NSDateAttributeType) {
NSDate *dateVal = (NSDate *)val;
[attrs setValue:@{kValueKey: [NSNumber numberWithInt:[dateVal timeIntervalSinceReferenceDate]],
kClassKey:[(NSAttributeDescription *)property attributeValueClassName]}
forKey:[property name]];
}
else if(attrType == NSBinaryDataAttributeType) {
NSData *dat = (NSData *)val;
NSString *klassName = [(NSAttributeDescription *)property attributeValueClassName];
if(klassName == nil) klassName = @"NSData"; // TODO: not tested whether this is needed.
[attrs setValue:@{kValueKey:[dat base64EncodedString],
kClassKey:klassName}
forKey:[property name]];
}
else if(attrType == NSTransformableAttributeType) {
NSValueTransformer *transformer = ({
NSString *transformerName = [(NSAttributeDescription *)property valueTransformerName];
(transformerName == nil ?
[[CodingValueTransformer alloc] init] :
[NSValueTransformer valueTransformerForName:transformerName]);
});
NSData *transformed = [transformer transformedValue:val];
[attrs setValue:@{kValueKey:[transformed base64EncodedString]} // a dictionary as value without a value for kClassKey implies a transformed val
forKey:[property name]];
}
else {
NSLog(@"WARNING: Can't serialize %@ value to JSON.", [(NSAttributeDescription *)property attributeValueClassName]);
}
}
}
// relantionships
else if([property isKindOfClass:[NSRelationshipDescription class]]) {
NSRelationshipDescription *relationship = (NSRelationshipDescription *)property;
if(! [relationship isToMany]) { // to-one
NSManagedObject *targetObject = [object valueForKey:[property name]];
if(targetObject == nil) {
[relations setValue:[NSNull null] forKey:[property name]];
}
else {
NSManagedObjectID *objID = [targetObject objectID];
if([objID isTemporaryID]) {
[context obtainPermanentIDsForObjects:@[targetObject] error:nil];
objID = [object objectID];
}
NSString *objIDString = [[objID URIRepresentation] path];
[relations setValue:@{kItemKey:objIDString,
kEntityKey:[[relationship destinationEntity] name]}
forKey:[property name]];
}
}
else { // to-many
id<NSFastEnumeration> targetObjects = [object valueForKey:[property name]];
{
NSMutableArray *tempObjects = [NSMutableArray array];
for(NSManagedObject *targetObject in targetObjects) {
if([targetObject.objectID isTemporaryID])
[tempObjects addObject:targetObject];
}
if([tempObjects count] > 0)
[context obtainPermanentIDsForObjects:tempObjects error:nil];
}
NSMutableArray *targetItems = [NSMutableArray array];
for(NSManagedObject *targetObject in targetObjects) {
NSManagedObjectID *objID = [targetObject objectID];
NSString *objIDString = [[objID URIRepresentation] path];
[targetItems addObject:objIDString];
}
[relations setValue:@{kItemsKey:targetItems,
kEntityKey:[[relationship destinationEntity] name]}
forKey:[property name]];
}
}
}
NSString *objIDString = ({
NSManagedObjectID *objID = [object objectID];
if([objID isTemporaryID]) {
[context obtainPermanentIDsForObjects:@[object] error:nil];
objID = [object objectID];
}
[[objID URIRepresentation] path];
});
[items addObject:@{kObjectIDKey: objIDString,
kAttrsKey: attrs,
kRelationshipsKey: relations}];
[data setObject:items forKey:[entity name]];
[context reset]; // save memory!
}
}
}
NSData *export = [NSJSONSerialization dataWithJSONObject:data options:0 error:nil];
MFMailComposeViewController *composeVC1 = [[MFMailComposeViewController alloc] init];
composeVC1 = [[MFMailComposeViewController alloc] init];
composeVC1.mailComposeDelegate = self;
[composeVC1 setSubject:[NSString stringWithFormat:@"Settings From %@ Event", [NSString stringWithFormat:@"tester_Export"]]];
[composeVC1 setMessageBody:[NSString stringWithFormat:@"Here are the event settings. Simply press on the attachment and then choose Open in my app"] isHTML:NO];
[composeVC1 addAttachmentData:export mimeType:@"application/octet-stream" fileName:[NSString stringWithFormat:@"tester_Export.myapp"]];
[self presentViewController:composeVC1 animated:NO completion:^(void){}];
