Try to create entity from classes with class prefixes

Classes/NSManagedObject+ActiveRecord.h

@@ -60,5 +60,7 @@
 #pragma mark - Naming
 
 + (NSString *)entityName;
++ (NSEntityDescription *)entity;
++ (NSEntityDescription *)entityInContext:(NSManagedObjectContext *)context;
 
 @end

Classes/NSManagedObject+ActiveRecord.m

@@ -185,6 +185,24 @@ + (NSString *)entityName {
     return NSStringFromClass(self);
 }
 
++ (NSEntityDescription *)entity {
+    return [self entityInContext:[NSManagedObjectContext defaultContext]];
+}
+
++ (NSEntityDescription *)entityInContext:(NSManagedObjectContext *)context {
+    NSString *name = [self entityName];
+    NSEntityDescription *entity = [NSEntityDescription entityForName:name
+                                              inManagedObjectContext:context];
+    if (!entity) // two letter class prefix
+        entity = [NSEntityDescription entityForName:[name substringFromIndex:2]
+                             inManagedObjectContext:context];
+    if (!entity) // three letter class prefix
+        entity = [NSEntityDescription entityForName:[name substringFromIndex:3]
+                             inManagedObjectContext:context];
+
+    return entity;
+}
+
 #pragma mark - Private
 
 + (NSPredicate *)predicateFromDictionary:(NSDictionary *)dict {
@@ -240,8 +258,9 @@ + (NSArray *)sortDescriptorsFromObject:(id)order {
 
 + (NSFetchRequest *)createFetchRequestInContext:(NSManagedObjectContext *)context {
     NSFetchRequest *request = [NSFetchRequest new];
-    NSEntityDescription *entity = [NSEntityDescription entityForName:[self entityName]
-                                              inManagedObjectContext:context];
+    NSEntityDescription *entity = [self entityInContext:context];
+
+    NSParameterAssert(entity);
     [request setEntity:entity];
     return request;
 }