/**
        Combines all models in the specified list of bundles and returns
        a consolidated model.

        If nil is supplied, then only the main bundled is searched.
     */
    NSManagedObjectModel *managedObjectModel =
        [NSManagedObjectModel mergedModelFromBundles:nil];

    // Create the persistent store coordinator.
    NSPersistentStoreCoordinator *storeCoordinator =
        [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel];

    /**
     Create the managed object context for use on the Main Queue.
     */
    NSManagedObjectContext *objectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
    objectContext.persistentStoreCoordinator = storeCoordinator;

    /**
        NSFileManager provides an abstraction layer on top of UNIX and finder
        commands that allows for CRUD operations on files.
     */
    NSFileManager *fileManager = [NSFileManager defaultManager];

    /**
        Returns a list of URLs for the user's document directory within the
        current app's sandbox.
     */
    NSArray<NSURL *> *documentsUrls = [fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask];

    // documentUrls will return an array of 1, so use that as the URL.
    NSURL *documentsUrl = [documentsUrls firstObject];

    // Append the desired file name and extension.
    NSURL *storeUrl = [documentsUrl URLByAppendingPathComponent:@"ExerciseOne.sqlite"];

    // Clears any existing data in the database if necessary if uncommented.
    // [[NSFileManager defaultManager] removeItemAtURL:storeUrl error:nil];

    NSError *error = nil;

    /**
        Include this to disable Write-Ahead Logging (WAL), which is the default
        for SQLite in iOS.

        Disabling WAL saves all changes to the *.sqlite file, which can then
        be read by a SQLite viewer.

        If viewing the SQLite DB via a viewer is not necessary, then comment
        out the line below.
     */
    NSDictionary *options = @{NSSQLitePragmasOption: @{@"journal_mode": @"DELETE"}};

    /**
     Adds a new store to the persistent store coordinator.
     */
    NSPersistentStore *store =
        [
            storeCoordinator
            // Possible types: in memory DB, SQLite, XML
            addPersistentStoreWithType:NSSQLiteStoreType
            configuration:nil
            URL:storeUrl // Store file location
            // Dictionary specifying options.  E.g., read-only.
            options:options
            error : &error
        ];

    NSAssert(
             store != nil,
             @"Error initializing persistent store coordinator: %@\n%@",
             [error localizedDescription], [error userInfo]
             );