NSManagedObjectContext performBlock() & performBlockAndWait() don't accept throwing closures

Originator:stephen.groom
Number:rdar://21745663 Date Originated:09-Jul-2015 04:11 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Swift 2b3
Classification:Other Bug Reproducible:Always
 
The methods performBlockAndWait(_:) and performBlock(_:) do not accept a closure which throws.  “Invalid conversion from throwing function of type '() throws -> _' to non-throwing function type '() -> Void’”.  I believe something like saving the context is a common use case for this:


    public func saveContexts() throws {
        do {
            backgroundContext.performBlockAndWait { [weak self] in
                try self?.backgroundContext.save()
            }
            mainContext.performBlockAndWait { [weak self] in
                try self?.mainContext.save()
            }
        }
        catch let error {
            throw error
        }
    }
       
Marking performBlockAndWait and performBlock as rethrows would allow them to take a throwing closure and propagate the error to the caller.

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