How to set the NSManagedObjectContext for MR_findFirst?

Question

I use MagicalRecord for my CoreData store. I have a statement that is generating multiple crashes by different users when this statement is executed:

PreferenceData *prefDataFound = [PreferenceData MR_findFirst];

The error is:

+entityForName: nil is not a legal NSManagedObjectContext parameter searching for entity name 'PreferenceData'

coming from this sequence of calls (from Crashlytics):

1   libobjc.A.dylib objc_exception_throw + 30
2   CoreData +[NSEntityDescription entityForName:inManagedObjectContext:] + 104
3   SalonBook NSManagedObject+MagicalRecord.m line 91
    +[NSManagedObject(MagicalRecord) MR_entityDescriptionInContext:]
4   SalonBook NSManagedObject+MagicalRequests.m line 19
    +[NSManagedObject(MagicalRequests) MR_createFetchRequestInContext:]
5   SalonBook NSManagedObject+MagicalFinders.m line 79
    +[NSManagedObject(MagicalFinders) MR_findFirstInContext:]
6   SalonBook NSManagedObject+MagicalFinders.m line 86
    +[NSManagedObject(MagicalFinders) MR_findFirst]
7   SalonBook SubViewGrid.m line 37
    -[SubViewGrid drawRect:]

All of this indicates to me that there is no valid context for the MR_findFirst call; oher than using *MR_findFirstWithPredicate:* (for which I have no predicate, I just want the first and only record), what can I do to fix this?

Answer 1

You can call

PreferenceData *prefDataFound = [PreferenceData MR_findFirstInContext:context];

with your current context, instead of relying on Magical Record to determine the current context magically.