Deleting Objects from Coredata - objective-c

Question

In my app I have a Place entity that contains reviews and featured objects at the minute my app is constantly refreshing these everytime i parse my xml data which is fine however I need to delete the review and featued objects before they are re parsed. My code is as follows and I believe I need to delete the objects in the parseXML method at the top:
-(void)parseXML:(NSString*)xml{
TBXML * tbxml = [TBXML tbxmlWithXMLString:xml];
if(tbxml.rootXMLElement){
[self traverseElement:tbxml.rootXMLElement];
if(self.tempItem){
NSLog(#"Ending Application");
[self configurePlaceChildrenAndSave];
[self startGeoCodingQueue];
}
}
}
-(void)fireGeocoder:(BSForwardGeocoder*)g{
NSLog(#"Begining FGC for %# (%#)",g.searchQuery,g.metaData);
[g findLocation];
}
-(void)startGeoCodingQueue{
[[NSUserDefaults standardUserDefaults] setValue:[NSNumber numberWithBool:YES] forKey:kGeoCoderInProgress];
int i = 0;
BSForwardGeocoder * fgc;
NSArray * a = [CoreDataBasicService fetchResultsForEnity:#"Place" andSortDiscriptor:#"name" Ascending:YES];
for (Place * p in a) {
if(p.latitude && p.longitude)continue;//skip geocoding if location data exists
fgc = [[BSForwardGeocoder alloc] initWithDelegate:self];
fgc.metaData = p.name;
fgc.searchQuery = p.postcode;
NSLog(#"gc:%i-%i",i,[a count]);
if([a count] == i+1){
fgc.last = YES;
}
float delay = (float)i*kGeoCoderDelay;
[self performSelector:#selector(fireGeocoder:) withObject:[fgc autorelease] afterDelay:delay];
fgc = nil;
i++;
}
[[NSUserDefaults standardUserDefaults] setValue:[NSNumber numberWithInt:i] forKey:kGeoCoderCompletedKey];
}
-(void)finishedGeocoding{
[[NSUserDefaults standardUserDefaults] setValue:[NSDate date] forKey:kGeoCoderlastRanKey];
[[NSUserDefaults standardUserDefaults] setValue:[NSNumber numberWithBool:NO] forKey:kGeoCoderInProgress];
[[NSNotificationCenter defaultCenter] postNotificationName:kGeoCoderNotificationName object:nil];
}
-(void)forwardGeocoderError:(BSForwardGeocoder *)geocoder errorMessage:(NSString *)errorMessage{
NSLog(#"EX ERROR: GEOCODER FAILED - %#",errorMessage);
if(geocoder.last)[self finishedGeocoding];
}
- (void)forwardGeocoderFoundLocation:(BSForwardGeocoder*)geocoder
{
if(geocoder.status == G_GEO_SUCCESS)
{
BSKmlResult *result = [geocoder.results lastObject];
if(!result)return;
//[self.fowardGeocodingQueue setObject:[NSString stringWithString:value] forKey:self.tempItem.name];
Place * p = [CoreDataBasicService fetchPlaceNamed:geocoder.metaData];
p.latitude = [NSNumber numberWithFloat:result.latitude];
p.longitude = [NSNumber numberWithFloat:result.longitude];
[CoreDataBasicService saveChanges];
//NSLog(#"%# - %f,%f",p2.name,p2.latitude,p2.longitude);
NSLog(#"completed Foward geocoding for '%#' (%#) [%f,%f]",geocoder.metaData,geocoder.searchQuery,[p.latitude floatValue],[p.longitude floatValue]);
if(geocoder.last)[self finishedGeocoding];
}
else {
NSString *message = #"";
switch (geocoder.status) {
case G_GEO_BAD_KEY:
message = #"The API key is invalid.";
break;
case G_GEO_UNKNOWN_ADDRESS:
message = [NSString stringWithFormat:#"Could not find %#", geocoder.searchQuery];
break;
case G_GEO_TOO_MANY_QUERIES:
message = #"Too many queries has been made for this API key.";
break;
case G_GEO_SERVER_ERROR:
message = #"Server error, please try again.";
break;
default:
break;
}
NSLog(#"ERROR: GEOCODER FAILED - %#",message);
// UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Information"
// message:message
// delegate:nil
// cancelButtonTitle:#"OK"
// otherButtonTitles: nil];
// [alert show];
// [alert release];
}
}
-(void)configurePlaceChildrenAndSave{
if(self.tempReviewArray.count==0 && self.tempReview)[self.tempReviewArray addObject:self.tempReview];
if(self.tempFeatureArray.count==0 && self.tempFeature)[self.tempFeatureArray addObject:self.tempFeature];
[self.tempItem setReviews:self.tempReviewArray];
[self.tempItem setFeatured:self.tempFeatureArray];
self.tempReviewArray = nil;
self.tempReview = nil;
self.tempFeatureArray = nil;
self.tempFeature = nil;
[CoreDataBasicService saveChanges];
self.tempItem = nil;
}
-(NSString*)formatKeyForCoreData:(NSString*)elementKey{
return [elementKey stringByReplacingOccurrencesOfString:#"-" withString:#""];
}
-(NSDate*)convertStringDateToDate:(NSString*)stringDate{
NSDateFormatter * df = [[NSDateFormatter alloc] init];
NSLog(#"DATE:%#",stringDate);
[df setDateFormat:#"y-M-d'T'H:m:s'Z'"];
NSDate * d = [df dateFromString:stringDate];
[df release];
return d;
}
-(Place*)getPlaceForName:(NSString*)name{
NSPredicate * pred = [NSPredicate predicateWithFormat:#"name = %#",name];
NSArray * results = [CoreDataBasicService fetchResultsForEnity:#"Place" WithPredicate:pred andSortDiscriptor:#"identifier" Ascending:YES];
return [results lastObject];
}
-(void)traverseElement:(TBXMLElement *)element {
do {
// Display the name of the element
NSString * value = [TBXML textForElement:element];
NSLog(#"%#-'%#'",[TBXML elementName:element],value);
// Obtain first attribute from element
NSString * ele = [TBXML elementName:element];
if([ele isEqualToString:#"place"]){
if(self.tempItem){
//GEOCODER HERE
[self configurePlaceChildrenAndSave];
}
//CREATE NEW CD ITEM HER
if(dataBaseExits){
TBXMLElement * idElement = [TBXML childElementNamed:#"name" parentElement:element];
Place * p = [self getPlaceForName:[NSString stringWithFormat:#"%#",[TBXML textForElement:idElement]]];
if(p){
[self setTempItem:p];
TBXMLElement * reviewsElement = [TBXML childElementNamed:#"reviews" parentElement:element];
if(reviewsElement){
self.tempItem.reviews = nil;
[CoreDataBasicService saveChanges];
[self traverseElement:reviewsElement];
}
TBXMLElement * promosElement = [TBXML childElementNamed:#"featured-places" parentElement:element];
if(promosElement){
self.tempItem.featured = nil;
[CoreDataBasicService saveChanges];
[self traverseElement:promosElement];
}
[CoreDataBasicService saveChanges];
continue;
}