iOSアプリのデータ操作はMagical Recordでマジ簡単！：生産性ガチアゲなオープンソースiOSライブラリ（3）（2/2 ページ）

#import <Availability.h>
#ifndef __IPHONE_3_0
#warning "This project uses features only available in iOS SDK 3.0 and later."
#endif
#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
    // #import <CoreData/CoreData.h>を削除し、下記を追加
    #import "CoreData+MagicalRecord.h"
#endif

#import "AppDelegate.h"
#import "Cat.h"
@implementation AppDelegate
@synthesize managedObjectContext = _managedObjectContext;
@synthesize managedObjectModel = _managedObjectModel;
@synthesize persistentStoreCoordinator = _persistentStoreCoordinator;
- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // *** 設定 ***
    // 保存方法を指定
    [MagicalRecord setupCoreDataStack];
    
    NSError *error;
    
    [self allDeleteCoreData]; // 全データを消去
    
    // *** Default CoreData ***
    
    // insert
    NSManagedObjectContext *context = [self managedObjectContext];
    Cat *cat1 = [NSEntityDescription insertNewObjectForEntityForName:
                 @"Cat" inManagedObjectContext:context];
    cat1.name = @"mike";
    cat1.age  = [NSNumber numberWithInt: 2];
    Cat *cat2 = [NSEntityDescription insertNewObjectForEntityForName:
                 @"Cat" inManagedObjectContext:context];
    cat2.name = @"tama";
    cat2.age  = [NSNumber numberWithInt: 5];
    Cat* cat3 = [NSEntityDescription insertNewObjectForEntityForName:
                 @"Cat" inManagedObjectContext:context];
    cat3.name = @"tora";
    cat3.age  = [NSNumber numberWithInt: 1];
    
    // update
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:
                                   @"Cat" inManagedObjectContext:context];
    fetchRequest = [[NSFetchRequest alloc] init];
    [fetchRequest setEntity:entity];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name = 'tama'"];
    [fetchRequest setPredicate:predicate];
    NSArray *fetchArr = [context executeFetchRequest:fetchRequest error:&error];
    Cat *tama = [fetchArr objectAtIndex:0];
    NSLog(@"tama age : %@", [tama age]);
    tama.age = [NSNumber numberWithInt: 3];
    
    // delete
    [fetchRequest setEntity:entity];
    predicate = [NSPredicate predicateWithFormat:@"name = 'mike'"];
    [fetchRequest setPredicate:predicate];
    fetchArr = [context executeFetchRequest:fetchRequest error:&error];
    Cat *mike = [fetchArr objectAtIndex:0];
    [context deleteObject:mike];
    
    // save
    error = nil;
    if (![context save:&error]) {
        NSLog(@"error = %@", error);
    }
    
    // check
    
    fetchRequest = [[NSFetchRequest alloc]initWithEntityName:@"Cat"];
    error = nil;
    NSArray *all = [context executeFetchRequest:fetchRequest error:&error];
    NSLog(@"all count : %d", [all count]);
    NSLog(@"all : %@", all);
    
    [self allDelete]; // 全データを消去
    
    // *** MagicalRecord ***
    
    NSManagedObjectContext *magicalContext = [NSManagedObjectContext MR_defaultContext];
    
    // insert
    Cat* magicalCat1 = [Cat MR_createEntity];
    magicalCat1.name = @"mike";
    magicalCat1.age  = [NSNumber numberWithInt: 2];
    Cat* magicalCat2 = [Cat MR_createEntity];
    magicalCat2.name = @"tama";
    magicalCat2.age  = [NSNumber numberWithInt: 5];
    Cat* magicalCat3 = [Cat MR_createEntity];
    magicalCat3.name = @"tora";
    magicalCat3.age  = [NSNumber numberWithInt: 1];
    
    // update
    Cat *magicalTama = [Cat MR_findFirstWithPredicate:
                        [NSPredicate predicateWithFormat:@"name = 'tama'"]];
    NSLog(@"magicalTama age : %@", [magicalTama age]);
    magicalTama.age = [NSNumber numberWithInt: 3];
    
    // delete
    Cat *magicalMike = [Cat MR_findFirstWithPredicate:
                        [NSPredicate predicateWithFormat:@"name = 'mike'"]];
    [magicalMike MR_deleteEntity];
    
    // save
    [magicalContext MR_saveOnlySelfAndWait];
    
    // check
    
    NSArray *magicalAll = [Cat MR_findAll];
    
    NSLog(@"magicalAll count : %d", [magicalAll count]);
    NSLog(@"magicalAll : %@", magicalAll);
    return YES;
}
- (void) allDeleteCoreData
{
    NSManagedObjectContext *context = [self managedObjectContext];
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc]initWithEntityName:@"Cat"];
    NSError *error = nil;
    NSArray *all = [context executeFetchRequest:fetchRequest error:&error];
    int len = [all count];
    for ( int i = 0 ; i < len ; i++ ) {
        Cat *cat = [all objectAtIndex:i];
        [context deleteObject:cat];
    }
    error = nil;
    if (![context save:&error]) {
        NSLog(@"error = %@", error);
    }
}
- (void) allDelete
{
    NSArray *all = [Cat MR_findAll];
    int len = [all count];
    for ( int i = 0 ; i < len ; i++ ) {
        Cat *cat = [all objectAtIndex:i];
        [cat MR_deleteEntity];
    }
}
- (void)applicationWillResignActive:(UIApplication *)application
{
...