RestKit/Examples/RKTwitterCoreData/Classes/RKTwitterAppDelegate.m

//
//  RKTwitterAppDelegate.m
//  RKTwitter
//
//  Created by Blake Watters on 9/5/10.
//  Copyright (c) 2009-2012 RestKit. All rights reserved.
//

#import <RestKit/RestKit.h>
#import <RestKit/CoreData.h>
#import "RKTwitterAppDelegate.h"
#import "RKTwitterViewController.h"
#import "RKTStatus.h"

@implementation RKTwitterAppDelegate

#pragma mark -
#pragma mark Application lifecycle

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Initialize RestKit
    NSURL *baseURL = [NSURL URLWithString:@"http://twitter.com"];
    RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];

    // Enable automatic network activity indicator management
    objectManager.client.requestQueue.showsNetworkActivityIndicatorWhenBusy = YES;

    // Initialize managed object store
    NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
    RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
    objectManager.managedObjectStore = managedObjectStore;
    [managedObjectStore release];

    // Setup our object mappings
    /*!
     Mapping by entity. Here we are configuring a mapping by targetting a Core Data entity with a specific
     name. This allows us to map back Twitter user objects directly onto NSManagedObject instances --
     there is no backing model class!
     */
    RKEntityMapping *userMapping = [RKEntityMapping mappingForEntityForName:@"RKTUser" inManagedObjectStore:managedObjectStore];
    userMapping.primaryKeyAttribute = @"userID";
    [userMapping mapKeyPath:@"id" toAttribute:@"userID"];
    [userMapping mapKeyPath:@"screen_name" toAttribute:@"screenName"];
    [userMapping mapAttributes:@"name", nil];

    RKEntityMapping *statusMapping = [RKEntityMapping mappingForEntityForName:@"RKTStatus" inManagedObjectStore:managedObjectStore];
    statusMapping.primaryKeyAttribute = @"statusID";
    [statusMapping mapKeyPathsToAttributes:@"id", @"statusID",
     @"created_at", @"createdAt",
     @"text", @"text",
     @"url", @"urlString",
     @"in_reply_to_screen_name", @"inReplyToScreenName",
     @"favorited", @"isFavorited",
     nil];
    [statusMapping mapRelationship:@"user" withMapping:userMapping];        

    // Update date format so that we can parse Twitter dates properly
    // Wed Sep 29 15:31:08 +0000 2010
    [RKObjectMapping addDefaultDateFormatterForString:@"E MMM d HH:mm:ss Z y" inTimeZone:nil];

    // Register our mappings with the provider
    [objectManager.mappingProvider setObjectMapping:statusMapping forResourcePathPattern:@"/status/user_timeline/:username"];

    // Uncomment this to use XML, comment it to use JSON
    //  objectManager.acceptMIMEType = RKMIMETypeXML;
    //  [objectManager.mappingProvider setMapping:statusMapping forKeyPath:@"statuses.status"];
    
    // Database seeding is configured as a copied target of the main application. There are only two differences
    // between the main application target and the 'Generate Seed Database' target:
    //  1) RESTKIT_GENERATE_SEED_DB is defined in the 'Preprocessor Macros' section of the build setting for the target
    //      This is what triggers the conditional compilation to cause the seed database to be built
    //  2) Source JSON files are added to the 'Generate Seed Database' target to be copied into the bundle. This is required
    //      so that the object seeder can find the files when run in the simulator.    
#ifdef RESTKIT_GENERATE_SEED_DB
    RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelInfo);
    RKLogConfigureByName("RestKit/CoreData", RKLogLevelTrace);
    
    NSError *error;
    NSString *seedStorePath = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"RKSeedDatabase.sqlite"];
    RKManagedObjectImporter *importer = [[RKManagedObjectImporter alloc] initWithManagedObjectModel:managedObjectModel storePath:seedStorePath];
    [importer importObjectsFromItemAtPath:[[NSBundle mainBundle] pathForResource:@"restkit" ofType:@"json"]
                              withMapping:statusMapping
                                  keyPath:nil
                                    error:&error];
    [importer importObjectsFromItemAtPath:[[NSBundle mainBundle] pathForResource:@"users" ofType:@"json"]
                              withMapping:userMapping
                                  keyPath:@"user"
                                    error:&error];
    BOOL success = [importer finishImporting:&error];
    if (success) {
        [importer logSeedingInfo];
    } else {
        RKLogError(@"Failed to finish import and save seed database due to error: %@", error);
    }
#else
    /**
     Complete Core Data stack initialization
     */
    [managedObjectStore createPersistentStoreCoordinator];
    NSString *storePath = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"RKTwitter.sqlite"];
    NSString *seedPath = [[NSBundle mainBundle] pathForResource:@"RKSeedDatabase" ofType:@"sqlite"];
    NSError *error;
    NSPersistentStore *persistentStore = [managedObjectStore addSQLitePersistentStoreAtPath:storePath fromSeedDatabaseAtPath:seedPath error:&error];
    NSAssert(persistentStore, @"Failed to add persistent store with error: %@", error);
    
    // Create the managed object contexts
    [managedObjectStore createManagedObjectContexts];
    
    // Configure a managed object cache to ensure we do not create duplicate objects
    managedObjectStore.managedObjectCache = [[RKInMemoryManagedObjectCache alloc] initWithManagedObjectContext:managedObjectStore.primaryManagedObjectContext];
#endif

    // Create Window and View Controllers
    RKTwitterViewController *viewController = [[[RKTwitterViewController alloc] initWithNibName:nil bundle:nil] autorelease];
    UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:viewController];
    UIWindow *window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    [window addSubview:controller.view];
    [window makeKeyAndVisible];

    return YES;
}

@end