Core data executeFetchRequest fail with exc_bad_access - ios

Question

From my understanding, this is a memory issue, especially since I call the method from several places several times with different timers.
Code below that throw the exception:
- (NSMutableArray*)getAllTraps
{
#synchronized(self)
{
self.fetchRequest = [[NSFetchRequest alloc] initWithEntityName:#"Trap"];
NSError *error = nil;
NSArray *results = [self.managedObjectContext executeFetchRequest:self.fetchRequest error:&error];
if (!results)
{
NSLog(#"Error fetching traps: %#", error.localizedDescription);
NSLog(#"Reason: %#", error.localizedFailureReason);
NSLog(#"Suggestion: %#", error.localizedRecoverySuggestion);
abort();
}
if (error != nil)
{
// Handle error
NSLog(#"Error getting all traps");
}
else
{
// Handle success
NSLog(#"Success getting all traps");
}
NSMutableArray *arrayOfAllTraps = [[NSMutableArray alloc] init];
for (int i = 0; i < results.count; i++)
{
Trap *singleTrap = results[i];
NSMutableDictionary *singleDict = [[NSMutableDictionary alloc] init];
if (singleTrap.trapID.integerValue > 0)
{
singleDict[ID] = singleTrap.trapID;
singleDict[ALARMDISTANCE] = singleTrap.alarmDistance;
singleDict[ISACTIVE] = singleTrap.isActive;
singleDict[LAT] = singleTrap.lat;
singleDict[LON] = singleTrap.lon;
singleDict[POLYGONS] = singleTrap.polys;
// NSLog(#"Trap ID: %#, Trap Description: %#", singleTrap.trapID, singleTrap.trapDescription);
singleDict[DESCRIPTION] = singleTrap.trapDescription;
singleDict[ROADNUMBER] = singleTrap.roadNumber;
singleDict[TYPE] = singleTrap.type;
singleDict[DEGREES] = singleTrap.degrees;
singleDict[DIRECTION] = singleTrap.direction;
if (singleTrap.poly0 == nil)
{
singleDict[POLYGON_A] = #"";
}
else
{
singleDict[POLYGON_A] = singleTrap.poly0;
}
// Make sure not to set NULL value #1
if (singleTrap.poly1 == nil)
{
singleDict[POLYGON_B] = #"";
}
else
{
singleDict[POLYGON_B] = singleTrap.poly1;
}
if (singleTrap.poly2 == nil)
{
singleDict[POLYGON_C] = #"";
}
else
{
singleDict[POLYGON_C] = singleTrap.poly2;
}
// Make sure not to set NULL value #2
if (singleTrap.polygonAzimut1 == nil)
{
singleDict[POLYGON_A_AZIMUTH] = #"";
}
else
{
singleDict[POLYGON_A_AZIMUTH] = singleTrap.polygonAzimut1;
}
if (singleTrap.polygonAzimut2 == nil)
{
singleDict[POLYGON_B_AZIMUTH] = #"";
}
else
{
singleDict[POLYGON_B_AZIMUTH] = singleTrap.polygonAzimut2;
}
if (singleTrap.polygonAzimut3 == nil)
{
singleDict[POLYGON_C_AZIMUTH] = #"";
}
else
{
singleDict[POLYGON_C_AZIMUTH] = singleTrap.polygonAzimut3;
}
[arrayOfAllTraps addObject:singleDict];
}
}
return arrayOfAllTraps;
}
}
The fail come right after:
NSArray *results = [self.managedObjectContext executeFetchRequest:self.fetchRequest error:&error];
And not even go inside 'if'.

Answer 1

Try this,
NSFetchRequest *fetch = [[NSFetchRequest alloc] init];
NSEntityDescription *entityDescription = [NSEntityDescription
entityForName:#"Trap" inManagedObjectContext:self.managedObjectContext];
[fetch setEntity:entityDescription];
NSError * error = nil;
NSArray *results = [self.managedObjectContext executeFetchRequest:fetch error:&error];