Switch out structs with __unsafe_unretained NSString * objects for at…

…tribute/relationship/etc keys in favor of full on NSObject subclasses. ARC, baby!

templates/machine.h.motemplate

@@ -11,27 +11,27 @@
 <$endif$>
 
 <$if noninheritedAttributes.@count > 0$>
-extern const struct <$managedObjectClassName$>Attributes {<$foreach Attribute noninheritedAttributes do$>
-	__unsafe_unretained NSString *<$Attribute.name$>;<$endforeach do$>
-} <$managedObjectClassName$>Attributes;
+@interface <$managedObjectClassName$>Attributes: NSObject <$foreach Attribute noninheritedAttributes do$>
++ (NSString *)<$Attribute.name$>;<$endforeach do$>
+@end
 <$endif$>
 
 <$if noninheritedRelationships.@count > 0$>
-extern const struct <$managedObjectClassName$>Relationships {<$foreach Relationship noninheritedRelationships do$>
-	__unsafe_unretained NSString *<$Relationship.name$>;<$endforeach do$>
-} <$managedObjectClassName$>Relationships;
+@interface <$managedObjectClassName$>Relationships: NSObject<$foreach Relationship noninheritedRelationships do$>
++ (NSString *)<$Relationship.name$>;<$endforeach do$>
+@end
 <$endif$>
 
 <$if noninheritedFetchedProperties.@count > 0$>
-extern const struct <$managedObjectClassName$>FetchedProperties {<$foreach FetchedProperty noninheritedFetchedProperties do$>
-	__unsafe_unretained NSString *<$FetchedProperty.name$>;<$endforeach do$>
-} <$managedObjectClassName$>FetchedProperties;
+@interface <$managedObjectClassName$>FetchedProperties: NSObject<$foreach FetchedProperty noninheritedFetchedProperties do$>
++ (NSString *)<$FetchedProperty.name$>;<$endforeach do$>
+@end
 <$endif$>
 
 <$if hasUserInfoKeys$>
-extern const struct <$managedObjectClassName$>UserInfo {<$foreach UserInfo userInfoKeyValues do$>
-	__unsafe_unretained NSString *<$UserInfo.key$>;<$endforeach do$>
-} <$managedObjectClassName$>UserInfo;
+@interface <$managedObjectClassName$>UserInfo: NSObject <$foreach UserInfo userInfoKeyValues do$>
++ (NSString *)<$UserInfo.key$>;<$endforeach do$>
+@end
 <$endif$>
 
 <$foreach Relationship noninheritedRelationships do$>@class <$Relationship.destinationEntity.managedObjectClassName$>;

templates/machine.m.motemplate

@@ -4,27 +4,35 @@
 #import "_<$managedObjectClassName$>.h"
 
 <$if noninheritedAttributes.@count > 0$>
-const struct <$managedObjectClassName$>Attributes <$managedObjectClassName$>Attributes = {<$foreach Attribute noninheritedAttributes do$>
-	.<$Attribute.name$> = @"<$Attribute.name$>",<$endforeach do$>
-};
+@implementation <$managedObjectClassName$>Attributes <$foreach Attribute noninheritedAttributes do$>
++ (NSString *)<$Attribute.name$> {
+	return @"<$Attribute.name$>";
+}<$endforeach do$>
+@end
 <$endif$>
 
 <$if noninheritedRelationships.@count > 0$>
-const struct <$managedObjectClassName$>Relationships <$managedObjectClassName$>Relationships = {<$foreach Relationship noninheritedRelationships do$>
-	.<$Relationship.name$> = @"<$Relationship.name$>",<$endforeach do$>
-};
+@implementation <$managedObjectClassName$>Relationships <$foreach Relationship noninheritedRelationships do$>
++ (NSString *)<$Relationship.name$> {
+	return @"<$Relationship.name$>";
+}<$endforeach do$>
+@end
 <$endif$>
 
 <$if noninheritedFetchedProperties.@count > 0$>
-const struct <$managedObjectClassName$>FetchedProperties <$managedObjectClassName$>FetchedProperties = {<$foreach FetchedProperty noninheritedFetchedProperties do$>
-	.<$FetchedProperty.name$> = @"<$FetchedProperty.name$>",<$endforeach do$>
-};
+@implementation <$managedObjectClassName$>FetchedProperties <$foreach FetchedProperty noninheritedFetchedProperties do$>
++ (NSString *)<$FetchedProperty.name$> {
+	return @"<$FetchedProperty.name$>";
+}<$endforeach do$>
+@end
 <$endif$>
 
 <$if hasUserInfoKeys$>
-const struct <$managedObjectClassName$>UserInfo <$managedObjectClassName$>UserInfo = {<$foreach UserInfo userInfoKeyValues do$>
-	.<$UserInfo.key$> = @"<$UserInfo.value$>",<$endforeach do$>
-};
+@implementation <$managedObjectClassName$>UserInfo <$foreach UserInfo userInfoKeyValues do$>
++ (NSString *)<$UserInfo.key$> {
+	return @"<$UserInfo.value$>";
+}<$endforeach do$>
+@end
 <$endif$>
 
 @implementation <$managedObjectClassName$>ID