Delete all instances of an NSManagedObject from CoreData.

NSManagedObject+CALDeleteAll.h

@import CoreData;

#import <Foundation/Foundation.h>

@interface NSManagedObject (CALDeleteAll)

/**
* Deletes all instances of this object from CoreData (may take a while)
*/
+ (void)cal_deleteAll:(NSManagedObjectContext *)context;
@end

NSManagedObject+CALDeleteAll.m

#import "NSManagedObject+CALDeleteAll.h"

@implementation NSManagedObject (CALDeleteAll)


+ (void)cal_deleteAll:(NSManagedObjectContext *)context {
    NSFetchRequest *allRecords = [[NSFetchRequest alloc] init];
    [allRecords setEntity:[NSEntityDescription entityForName:NSStringFromClass(self.class)
                                      inManagedObjectContext:context]];
    [allRecords setIncludesPropertyValues:NO];
    NSError *error = nil;
    NSArray *result = [context executeFetchRequest:allRecords error:&error];
    for (NSManagedObject *profile in result) {
        [context deleteObject:profile];
    }
    NSError *saveError = nil;
    [context save:&saveError];
}

@end