How to pass entity in saveWithBlock to completion block

Question

I do know that MagicalRecord will execute saveWithBlock on backend thread and execute completion on main thread, but just get confused about how to pass entity in saveWithBlock to completion block, specifically:

Event *wantToCreateEvent = nil;
Event *wantToUpdateEvent = toBeUpdatedEvent;

[MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext){
    wantToCreateEvent = [Event MR_createEntityInContext:localContext];

    Event *localContextEvent = [wantToUpdateEvent MR_inContext:localContext];
    localContextEvent.attri = @"newValue"
} completion:^(BOOL success, NSError *error) {

    // Can I use wantToCreateEvent directly here?

    // Is wantToUpdateEvent updated here?
}

Answer 1

For Entity Creation you can use 2 functions of Megical Record

+ (id) MR_createEntityInContext:(NSManagedObjectContext *)context;
+ (id) MR_createEntity;

Note: For Saving the Entities You just have to Save the Context in which these entities are created

Save In Background

+ (void) saveWithBlock:(void(^)(NSManagedObjectContext *localContext))block;
+ (void) saveWithBlock:(void(^)(NSManagedObjectContext *localContext))block completion:(MRSaveCompletionHandler)completion;

Save in Main Thread

+ (void) saveWithBlockAndWait:(void(^)(NSManagedObjectContext *localContext))block;

For More Understanding about CoreData With MegicalRecord I would recommend you to go through this tutorial

Understanding CoreData With Magical Record