Core Data Helper

CoreDataHelper.m

//
//  CoreDataHelper.m
//  Wired In
//
//  Created by Caleb Hicks on 6/20/14.
//
//  Readme: I use a version of this file in each Core Data project I create. It runs as a Shared Instance.
//  Simply, it returns the default Managed Object Context for the app. Sample methods also provided to save, create sample
//  data, and log all data within the app. Adjust the Imports and related methods for your model objects.
//
//  Enjoy! Any questions? Comment below or @calebhicks on Twitter.

#import "CoreDataHelper.h"
#import "WIAppDelegate.h"
#import "WIRoundController.h"
#import "Tag.h"
#import "Task.h"
#import "Round.h"

@implementation CoreDataHelper

+ (CoreDataHelper *)sharedInstance {
    static CoreDataHelper *sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [CoreDataHelper new];
    });
    return sharedInstance;
}

- (NSManagedObjectContext *)managedObjectContext{

    WIAppDelegate *appDelegate = [UIApplication sharedApplication].delegate;

    NSManagedObjectContext *managedObjectContext = appDelegate.managedObjectContext;
    
    return managedObjectContext;
}

- (void) save{
    [self.managedObjectContext save:nil];
}

-(void)setUpSampleData: (NSInteger)withIdentifier{
    
    Tag *tag = [NSEntityDescription insertNewObjectForEntityForName:@"Tag" inManagedObjectContext:[[CoreDataHelper sharedInstance] managedObjectContext]];
    
    tag.tagName = [NSString stringWithFormat: @"awesomeTag %ld", (long)withIdentifier];
    
    Round *round = [NSEntityDescription insertNewObjectForEntityForName:@"Round" inManagedObjectContext:[[CoreDataHelper sharedInstance] managedObjectContext]];
    
    round.duration = @1200;
    round.startTime = [NSDate dateWithTimeInterval:0 sinceDate:[NSDate date]];
    round.endTime = [NSDate dateWithTimeInterval:1200 sinceDate:[NSDate date]];
    round.roundDescription = [NSString stringWithFormat: @"Round Description %ld", (long)withIdentifier];
                       
    
    Task *task = [NSEntityDescription insertNewObjectForEntityForName:@"Task" inManagedObjectContext:[[CoreDataHelper sharedInstance] managedObjectContext]];
    
    task.duration = @1200;
    task.startTime = [NSDate dateWithTimeInterval:0 sinceDate:[NSDate date]];
    task.finishTime = [NSDate dateWithTimeInterval:1200 sinceDate:[NSDate date]];
    task.taskName = [NSString stringWithFormat:@"task name %ld", (long)withIdentifier];
    task.complete = @1;
    
    round.tasks = [NSSet setWithArray: @[task]];
    task.tags = [NSSet setWithArray: @[tag]];
    
}

- (void)logCurrentData{
    
    NSFetchRequest* roundRequest = [NSFetchRequest fetchRequestWithEntityName:@"Round"];
    NSArray *rounds = [[[CoreDataHelper sharedInstance]managedObjectContext] executeFetchRequest:roundRequest error:NULL];
    
    for (Round *round in rounds) {
        NSLog(@"Round Description: %@", round.roundDescription);
        
        for (Task *task in round.tasks) {
            NSLog(@"Task Named: %@", task.taskName);
            
            for (Tag *tag in task.tags) {
                NSLog(@"Tag Named: %@", tag.tagName);
            }
        }
    }
}

@end