diff --git a/README.md b/README.md
index 1fbe989..daba53c 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperation
   NSError *err;
   
   //Using categories doesn't require additional setups
-  User *user = [User insertWithDictionary:JSON error:&err];
+  User *user = [User insertWithDictionary:JSON error:&err commit:YES];];
   
   //you are good to go with `user`
   
diff --git a/Sample/Address.h b/Sample/Address.h
new file mode 100644
index 0000000..4921764
--- /dev/null
+++ b/Sample/Address.h
@@ -0,0 +1,20 @@
+//
+//  Address.h
+//  Sample
+//
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <CoreData/CoreData.h>
+
+@class Contact;
+
+@interface Address : NSManagedObject
+
+@property (nonatomic, retain) NSString * city;
+@property (nonatomic, retain) NSString * state;
+@property (nonatomic, retain) Contact *contact;
+
+@end
diff --git a/Sample/Address.m b/Sample/Address.m
new file mode 100644
index 0000000..603ee3f
--- /dev/null
+++ b/Sample/Address.m
@@ -0,0 +1,19 @@
+//
+//  Address.m
+//  Sample
+//
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
+//
+
+#import "Address.h"
+#import "Contact.h"
+
+
+@implementation Address
+
+@dynamic city;
+@dynamic state;
+@dynamic contact;
+
+@end
diff --git a/Sample/Contact.h b/Sample/Contact.h
new file mode 100644
index 0000000..69697c1
--- /dev/null
+++ b/Sample/Contact.h
@@ -0,0 +1,29 @@
+//
+//  Contact.h
+//  Sample
+//
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <CoreData/CoreData.h>
+
+@class Address, PhoneNumber;
+
+@interface Contact : NSManagedObject
+
+@property (nonatomic, retain) NSNumber * age;
+@property (nonatomic, retain) NSString * name;
+@property (nonatomic, retain) Address *address;
+@property (nonatomic, retain) NSSet *phoneNumbers;
+@end
+
+@interface Contact (CoreDataGeneratedAccessors)
+
+- (void)addPhoneNumbersObject:(PhoneNumber *)value;
+- (void)removePhoneNumbersObject:(PhoneNumber *)value;
+- (void)addPhoneNumbers:(NSSet *)values;
+- (void)removePhoneNumbers:(NSSet *)values;
+
+@end
diff --git a/Sample/Contact.m b/Sample/Contact.m
new file mode 100644
index 0000000..b32ada0
--- /dev/null
+++ b/Sample/Contact.m
@@ -0,0 +1,21 @@
+//
+//  Contact.m
+//  Sample
+//
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
+//
+
+#import "Contact.h"
+#import "Address.h"
+#import "PhoneNumber.h"
+
+
+@implementation Contact
+
+@dynamic age;
+@dynamic name;
+@dynamic address;
+@dynamic phoneNumbers;
+
+@end
diff --git a/Sample/Sample/DataVersion.h b/Sample/DataVersion.h
similarity index 73%
rename from Sample/Sample/DataVersion.h
rename to Sample/DataVersion.h
index b407781..1f5a307 100644
--- a/Sample/Sample/DataVersion.h
+++ b/Sample/DataVersion.h
@@ -2,8 +2,8 @@
 //  DataVersion.h
 //  Sample
 //
-//  Created by Jaehwa Han on 12/4/12.
-//  Copyright (c) 2012 Jaehwa Han. All rights reserved.
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
 //
 
 #import <Foundation/Foundation.h>
diff --git a/Sample/Sample/DataVersion.m b/Sample/DataVersion.m
similarity index 59%
rename from Sample/Sample/DataVersion.m
rename to Sample/DataVersion.m
index 64641a3..387362b 100644
--- a/Sample/Sample/DataVersion.m
+++ b/Sample/DataVersion.m
@@ -2,8 +2,8 @@
 //  DataVersion.m
 //  Sample
 //
-//  Created by Jaehwa Han on 12/4/12.
-//  Copyright (c) 2012 Jaehwa Han. All rights reserved.
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
 //
 
 #import "DataVersion.h"
diff --git a/Sample/Sample/Group.h b/Sample/Group.h
similarity index 75%
rename from Sample/Sample/Group.h
rename to Sample/Group.h
index d7dee79..106bc30 100644
--- a/Sample/Sample/Group.h
+++ b/Sample/Group.h
@@ -2,8 +2,8 @@
 //  Group.h
 //  Sample
 //
-//  Created by Jaehwa Han on 12/4/12.
-//  Copyright (c) 2012 Jaehwa Han. All rights reserved.
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
 //
 
 #import <Foundation/Foundation.h>
@@ -12,8 +12,8 @@
 
 @interface Group : NSManagedObject
 
-@property (nonatomic, retain) NSString * title;
 @property (nonatomic, retain) NSDate * createdAt;
 @property (nonatomic, retain) NSNumber * id;
+@property (nonatomic, retain) NSString * title;
 
 @end
diff --git a/Sample/Sample/Group.m b/Sample/Group.m
similarity index 58%
rename from Sample/Sample/Group.m
rename to Sample/Group.m
index 01a4100..4be316c 100644
--- a/Sample/Sample/Group.m
+++ b/Sample/Group.m
@@ -2,8 +2,8 @@
 //  Group.m
 //  Sample
 //
-//  Created by Jaehwa Han on 12/4/12.
-//  Copyright (c) 2012 Jaehwa Han. All rights reserved.
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
 //
 
 #import "Group.h"
@@ -11,8 +11,8 @@
 
 @implementation Group
 
-@dynamic title;
 @dynamic createdAt;
 @dynamic id;
+@dynamic title;
 
 @end
diff --git a/Sample/NSManagedObject Goodies Test/NSManagedObject_Goodies_Test.m b/Sample/NSManagedObject Goodies Test/NSManagedObject_Goodies_Test.m
index f1ee50c..04b490e 100644
--- a/Sample/NSManagedObject Goodies Test/NSManagedObject_Goodies_Test.m	
+++ b/Sample/NSManagedObject Goodies Test/NSManagedObject_Goodies_Test.m	
@@ -51,7 +51,7 @@ - (void)testExample
     ////
     NSDictionary *user = @{@"name": @"John Doe", @"emails":@[@"john@doe.com", @"john.doe@gmail.com"]};
     NSError *err;
-    User *u = [User insertWithDictionary:user error:&err];
+    User *u = [User newWithDictionary:user error:&err commit:YES];
     STAssertNil(err, @"There should be no error");
     STAssertTrue(u != nil, @"User must be persisted");
     
@@ -74,7 +74,7 @@ - (void)testExample
     //// Key format conversion (under_score and camelCase) & Data conversion (NSDate)
     ////
     NSDictionary *group = @{@"title":@"My best friends", @"created_at":@(1354652336)};
-    Group *g = [Group insertWithDictionary:group error:&err];
+    Group *g = [Group newWithDictionary:group error:&err commit:YES];
     STAssertNil(err, @"There should be no error");
     STAssertNotNil(g, @"New group should  not be nil");
     STAssertTrue([[Group findWithPredicate:nil] count] == 1, @"");
@@ -89,7 +89,7 @@ - (void)testExample
     ////
     
     NSDictionary *group2 = @{@"title":group[@"title"], @"created_at":@(1354653107)};
-    Group *g2 = [Group insertWithDictionary:group2 uniqueKey:@"title" error:&err];
+    Group *g2 = [Group newWithDictionary:group2 uniqueKey:@"title" error:&err commit:YES];
     STAssertNil(g2, @"Duplicate key records can't be exist simultaneously");
     
     NSArray *groups = [Group findWithPredicate:nil];
@@ -99,10 +99,10 @@ - (void)testExample
     //// Default unique key test (`id` or `_id`)
     ////
     NSDictionary *group3 = @{@"title":@"Group 3", @"id":@(42), @"created_at":@(1354653107)};
-    Group *g3 = [Group updateWithDictionary:group3];
+    Group *g3 = [Group updateWithDictionary:group3 commit:YES];
     
     NSDictionary *group4 = @{@"title":@"Group 4", @"id":@(42), @"created_at":@(1354653108)};
-    Group *g4 = [Group updateWithDictionary:group4];
+    Group *g4 = [Group updateWithDictionary:group4 commit:YES];
     
     STAssertTrue([g4.title isEqualToString:group4[@"title"]], @"updated comparing id");
     
@@ -113,10 +113,10 @@ - (void)testExample
     //// Multi key test (these conditions are concatenated by `AND`)
     ////
     NSDictionary *group5 = @{@"title":@"Group 5", @"id":@(43), @"created_at":@(1354653107)};
-    Group *g5 = [Group updateWithDictionary:group5 uniqueKeys:@[@"id", @"title"] upsert:YES error:nil];
+    Group *g5 = [Group updateWithDictionary:group5 uniqueKeys:@[@"id", @"title"] upsert:YES error:nil commit:YES];
     
     NSDictionary *group6 = @{@"title":@"Group 6", @"id":@(43), @"created_at":@(1354653108)};
-    Group *g6 = [Group updateWithDictionary:group6 uniqueKeys:@[@"id", @"title"] upsert:YES error:nil];
+    Group *g6 = [Group updateWithDictionary:group6 uniqueKeys:@[@"id", @"title"] upsert:YES error:nil commit:YES];
     
     STAssertTrue([[Group findWithPredicate:@"SELF.id == 43"] count] == 2, @"Multikey should be concatenated with AND");
     
@@ -131,4 +131,30 @@ - (void)testExample
     STAssertEqualObjects(g2.title, @"friends", @"group must be updated");
 }
 
+-(void)testContact
+{
+    NSDictionary* contactDict = @{@"name": @"John Smith",
+                              @"age": @25 ,
+                              @"address":@{
+                                      @"city": @"New York",
+                                      @"state": @"NY"},
+                              @"phoneNumbers":@[
+                                      @{@"type": @"home",
+                                        @"number": @3454353},
+                                      @{@"type": @"fax",
+                                        @"number": @1235},
+                                      ]
+                              };
+    
+    NSError *err;
+    Contact* contact = [Contact newWithDictionary:contactDict error:&err commit:YES];
+    STAssertNil(err, @"There should be no error");
+    STAssertTrue(contact != nil, @"User must be persisted");
+    
+    STAssertTrue([contact.address.city isEqualToString:@"New York"], @"Wrong address");
+    STAssertTrue(contact.phoneNumbers.count == 2, @"A phone number missing");
+}
+
+
+
 @end
diff --git a/Sources/NSString+CamelCaseConversion.h b/Sample/NSString+StringTools.h
similarity index 57%
rename from Sources/NSString+CamelCaseConversion.h
rename to Sample/NSString+StringTools.h
index 60c8476..28c19d9 100644
--- a/Sources/NSString+CamelCaseConversion.h
+++ b/Sample/NSString+StringTools.h
@@ -8,8 +8,14 @@
 
 #import <Foundation/Foundation.h>
 
-@interface NSString (CamelCaseConversion)
+@interface NSString (StringTools)
+
 - (NSString *)toCamelCase;
 - (NSString *)toUnderscore;
+- (NSString *) capitalizeFirstLetter;
+- (NSString *) lowercaseFirstLetter;
+- (NSString *) humanize;
+- (NSString*)pluralToSingle;
+- (BOOL)isVowel;
 
 @end
diff --git a/Sample/NSString+StringTools.m b/Sample/NSString+StringTools.m
new file mode 100644
index 0000000..3c2a861
--- /dev/null
+++ b/Sample/NSString+StringTools.m
@@ -0,0 +1,113 @@
+//
+//  NSString+CamelCaseConversion.m
+//  Sample
+//
+//  Created by Jaehwa Han on 12/4/12.
+//  Copyright (c) 2012 Jaehwa Han. All rights reserved.
+//
+
+#import "NSString+StringTools.h"
+#import "RegexKitLite.h"
+
+@implementation NSString (StringTools)
+- (NSString *)toCamelCase
+{
+    return [self stringByReplacingOccurrencesOfRegex:@"_([a-zA-Z0-9]+)" usingBlock:^NSString *(NSInteger captureCount, NSString * const capturedStrings[captureCount], const NSRange capturedRanges[captureCount], volatile BOOL * const stop) {
+        return [capturedStrings[1] capitalizedString];
+    }];
+}
+
+- (NSString *)toUnderscore
+{
+    return [self stringByReplacingOccurrencesOfRegex:@"[A-Z]" usingBlock:^NSString *(NSInteger captureCount, NSString * const capturedStrings[captureCount], const NSRange capturedRanges[captureCount], volatile BOOL * const stop) {
+        unichar cs[2] = {(unichar)'_', [capturedStrings[0] characterAtIndex:0] + 32};
+        return [NSString stringWithCharacters:cs length:2];
+    }];
+}
+
+
+- (NSString *) capitalizeFirstLetter
+{
+    return [NSString stringWithFormat:@"%@%@",
+            [[self substringWithRange:NSMakeRange(0, 1)] uppercaseString],
+            [self substringWithRange:NSMakeRange(1, [self length]-1)]
+            ];
+}
+
+
+- (NSString *) capitalizeLastLetter
+{
+    return [NSString stringWithFormat:@"%@%@",
+            [self substringWithRange:NSMakeRange(0, [self length]-1)],
+            [[self substringWithRange:NSMakeRange([self length]-1, 1)] uppercaseString]
+            ];
+}
+
+- (NSString *) humanize
+{
+    return [self stringByReplacingOccurrencesOfRegex:@"([a-z])([A-Z])" withString:@"$1 $2"];
+}
+
+- (NSString *) lowercaseFirstLetter
+{
+    return [NSString stringWithFormat:@"%@%@",
+            [[self substringWithRange:NSMakeRange(0, 1)] lowercaseString],
+            [self substringWithRange:NSMakeRange(1, [self length]-1)]
+            ];
+}
+
+-(NSString*)pluralToSingle
+{
+    if ([self pluralToSingleExceptions]){
+        return [self pluralToSingleExceptions];
+    }
+    
+    if ([[self substringFromIndex:self.length-3] isEqualToString:@"ies"]) { //e.g. countries
+        return [NSString stringWithFormat:@"%@y",[self substringWithRange:NSMakeRange(0, self.length-3)]];
+    }
+    if ([[self substringFromIndex:self.length-2] isEqualToString:@"es"]) {
+        if (
+            [[self substringWithRange:NSMakeRange(self.length-3, 1)] isEqualToString:@"x"] || //e.g. boxes
+            [[self substringWithRange:NSMakeRange(self.length-3, 1)] isEqualToString:@"s"] || //e.g. kisses
+            [[self substringWithRange:NSMakeRange(self.length-4, 2)] isEqualToString:@"ch"] || //e.g. churches
+            [[self substringWithRange:NSMakeRange(self.length-4, 2)] isEqualToString:@"sh"] //e.g. dishes
+            )
+        {
+            return [self substringWithRange:NSMakeRange(0, [self length]-2)];
+        }
+    }
+    
+    if ([[self substringFromIndex:self.length-1] isEqualToString:@"s"]) //e.g. dogs, books, towns
+    {
+        return [self substringWithRange:NSMakeRange(0, [self length]-1)];
+    }
+    
+    return self;
+}
+
+-(NSString*)pluralToSingleExceptions
+{
+    if ([self isEqualToString:@"taxies"]) {
+        return @"taxi";
+    }
+    
+    return nil;
+}
+
+-(BOOL)isVowel
+{
+    if ([self isEqualToString:@"a"] ||
+        [self isEqualToString:@"e"] ||
+        [self isEqualToString:@"i"] ||
+        [self isEqualToString:@"o"] ||
+        [self isEqualToString:@"u"] )
+    {
+        return YES;
+    }
+    
+    return NO;
+}
+
+
+
+@end
diff --git a/Sample/PhoneNumber.h b/Sample/PhoneNumber.h
new file mode 100644
index 0000000..0d85c30
--- /dev/null
+++ b/Sample/PhoneNumber.h
@@ -0,0 +1,20 @@
+//
+//  PhoneNumber.h
+//  Sample
+//
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <CoreData/CoreData.h>
+
+@class Contact;
+
+@interface PhoneNumber : NSManagedObject
+
+@property (nonatomic, retain) NSNumber * number;
+@property (nonatomic, retain) NSString * type;
+@property (nonatomic, retain) Contact *contact;
+
+@end
diff --git a/Sample/PhoneNumber.m b/Sample/PhoneNumber.m
new file mode 100644
index 0000000..511748c
--- /dev/null
+++ b/Sample/PhoneNumber.m
@@ -0,0 +1,19 @@
+//
+//  PhoneNumber.m
+//  Sample
+//
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
+//
+
+#import "PhoneNumber.h"
+#import "Contact.h"
+
+
+@implementation PhoneNumber
+
+@dynamic number;
+@dynamic type;
+@dynamic contact;
+
+@end
diff --git a/Sample/Sample.xcodeproj/project.pbxproj b/Sample/Sample.xcodeproj/project.pbxproj
index c1e967e..e9fbb60 100644
--- a/Sample/Sample.xcodeproj/project.pbxproj
+++ b/Sample/Sample.xcodeproj/project.pbxproj
@@ -19,7 +19,6 @@
 		37D93C80166E5B9B00026ED5 /* Default-568h@2x.png in Resources */ = {isa = PBXBuildFile; fileRef = 37D93C7F166E5B9B00026ED5 /* Default-568h@2x.png */; };
 		37D93C83166E5B9B00026ED5 /* Sample.xcdatamodeld in Sources */ = {isa = PBXBuildFile; fileRef = 37D93C81166E5B9B00026ED5 /* Sample.xcdatamodeld */; };
 		37D93C8B166E5BE200026ED5 /* NSManagedObject+TemporaryObject.m in Sources */ = {isa = PBXBuildFile; fileRef = 37D93C8A166E5BE200026ED5 /* NSManagedObject+TemporaryObject.m */; };
-		37D93C90166E6DBA00026ED5 /* NSString+CamelCaseConversion.m in Sources */ = {isa = PBXBuildFile; fileRef = 37D93C8F166E6DBA00026ED5 /* NSString+CamelCaseConversion.m */; };
 		37D93C94166E6E6100026ED5 /* RegexKitLite.m in Sources */ = {isa = PBXBuildFile; fileRef = 37D93C93166E6E6100026ED5 /* RegexKitLite.m */; settings = {COMPILER_FLAGS = "-fno-objc-arc"; }; };
 		37D93C97166E6EA400026ED5 /* NSManagedObject+FromDictionary.m in Sources */ = {isa = PBXBuildFile; fileRef = 37D93C96166E6EA400026ED5 /* NSManagedObject+FromDictionary.m */; };
 		37D93C99166E7B7300026ED5 /* libicucore.A.dylib in Frameworks */ = {isa = PBXBuildFile; fileRef = 37D93C98166E7B7300026ED5 /* libicucore.A.dylib */; };
@@ -32,10 +31,14 @@
 		37D93CB3166E895A00026ED5 /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 37D93C69166E5B9B00026ED5 /* Foundation.framework */; };
 		37D93CB9166E895A00026ED5 /* InfoPlist.strings in Resources */ = {isa = PBXBuildFile; fileRef = 37D93CB7166E895A00026ED5 /* InfoPlist.strings */; };
 		37D93CBC166E895A00026ED5 /* NSManagedObject_Goodies_Test.m in Sources */ = {isa = PBXBuildFile; fileRef = 37D93CBB166E895A00026ED5 /* NSManagedObject_Goodies_Test.m */; };
-		37D93CC6166E8C4000026ED5 /* Group.m in Sources */ = {isa = PBXBuildFile; fileRef = 37D93CC5166E8C4000026ED5 /* Group.m */; };
-		37D93CC9166E8C4000026ED5 /* DataVersion.m in Sources */ = {isa = PBXBuildFile; fileRef = 37D93CC8166E8C4000026ED5 /* DataVersion.m */; };
-		37D93CCC166E8C4000026ED5 /* User.m in Sources */ = {isa = PBXBuildFile; fileRef = 37D93CCB166E8C4000026ED5 /* User.m */; };
 		37D93CD0166E98FB00026ED5 /* NSManagedObject+Delete.m in Sources */ = {isa = PBXBuildFile; fileRef = 37D93CCF166E98FB00026ED5 /* NSManagedObject+Delete.m */; };
+		75DB5C301896BF9600F481A8 /* PhoneNumber.m in Sources */ = {isa = PBXBuildFile; fileRef = 75DB5C2F1896BF9600F481A8 /* PhoneNumber.m */; };
+		75DB5C331896BF9600F481A8 /* Contact.m in Sources */ = {isa = PBXBuildFile; fileRef = 75DB5C321896BF9600F481A8 /* Contact.m */; };
+		75DB5C361896BF9600F481A8 /* Group.m in Sources */ = {isa = PBXBuildFile; fileRef = 75DB5C351896BF9600F481A8 /* Group.m */; };
+		75DB5C391896BF9600F481A8 /* User.m in Sources */ = {isa = PBXBuildFile; fileRef = 75DB5C381896BF9600F481A8 /* User.m */; };
+		75DB5C3C1896BF9600F481A8 /* Address.m in Sources */ = {isa = PBXBuildFile; fileRef = 75DB5C3B1896BF9600F481A8 /* Address.m */; };
+		75DB5C3F1896BF9600F481A8 /* DataVersion.m in Sources */ = {isa = PBXBuildFile; fileRef = 75DB5C3E1896BF9600F481A8 /* DataVersion.m */; };
+		75FD44A01896B7CA0009B95D /* NSString+StringTools.m in Sources */ = {isa = PBXBuildFile; fileRef = 75FD449F1896B7CA0009B95D /* NSString+StringTools.m */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -67,8 +70,6 @@
 		37D93C89166E5BE200026ED5 /* NSManagedObject+TemporaryObject.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = "NSManagedObject+TemporaryObject.h"; path = "../Sources/NSManagedObject+TemporaryObject.h"; sourceTree = "<group>"; };
 		37D93C8A166E5BE200026ED5 /* NSManagedObject+TemporaryObject.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = "NSManagedObject+TemporaryObject.m"; path = "../Sources/NSManagedObject+TemporaryObject.m"; sourceTree = "<group>"; };
 		37D93C8C166E5C9500026ED5 /* NSManagedObject+Convenients.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "NSManagedObject+Convenients.h"; path = "../Sources/NSManagedObject+Convenients.h"; sourceTree = "<group>"; };
-		37D93C8E166E6DBA00026ED5 /* NSString+CamelCaseConversion.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = "NSString+CamelCaseConversion.h"; path = "../Sources/NSString+CamelCaseConversion.h"; sourceTree = "<group>"; };
-		37D93C8F166E6DBA00026ED5 /* NSString+CamelCaseConversion.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = "NSString+CamelCaseConversion.m"; path = "../Sources/NSString+CamelCaseConversion.m"; sourceTree = "<group>"; };
 		37D93C92166E6E6100026ED5 /* RegexKitLite.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RegexKitLite.h; sourceTree = "<group>"; };
 		37D93C93166E6E6100026ED5 /* RegexKitLite.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RegexKitLite.m; sourceTree = "<group>"; };
 		37D93C95166E6EA400026ED5 /* NSManagedObject+FromDictionary.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = "NSManagedObject+FromDictionary.h"; path = "../Sources/NSManagedObject+FromDictionary.h"; sourceTree = "<group>"; };
@@ -90,15 +91,23 @@
 		37D93CBA166E895A00026ED5 /* NSManagedObject_Goodies_Test.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = NSManagedObject_Goodies_Test.h; sourceTree = "<group>"; };
 		37D93CBB166E895A00026ED5 /* NSManagedObject_Goodies_Test.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = NSManagedObject_Goodies_Test.m; sourceTree = "<group>"; };
 		37D93CBD166E895A00026ED5 /* NSManagedObject Goodies Test-Prefix.pch */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "NSManagedObject Goodies Test-Prefix.pch"; sourceTree = "<group>"; };
-		37D93CC4166E8C4000026ED5 /* Group.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = Group.h; sourceTree = "<group>"; };
-		37D93CC5166E8C4000026ED5 /* Group.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = Group.m; sourceTree = "<group>"; };
-		37D93CC7166E8C4000026ED5 /* DataVersion.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DataVersion.h; sourceTree = "<group>"; };
-		37D93CC8166E8C4000026ED5 /* DataVersion.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = DataVersion.m; sourceTree = "<group>"; };
-		37D93CCA166E8C4000026ED5 /* User.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = User.h; sourceTree = "<group>"; };
-		37D93CCB166E8C4000026ED5 /* User.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = User.m; sourceTree = "<group>"; };
 		37D93CCD166E8CA000026ED5 /* Models.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = Models.h; sourceTree = "<group>"; };
 		37D93CCE166E98FB00026ED5 /* NSManagedObject+Delete.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = "NSManagedObject+Delete.h"; path = "../Sources/NSManagedObject+Delete.h"; sourceTree = "<group>"; };
 		37D93CCF166E98FB00026ED5 /* NSManagedObject+Delete.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = "NSManagedObject+Delete.m"; path = "../Sources/NSManagedObject+Delete.m"; sourceTree = "<group>"; };
+		75DB5C2E1896BF9600F481A8 /* PhoneNumber.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = PhoneNumber.h; path = ../PhoneNumber.h; sourceTree = "<group>"; };
+		75DB5C2F1896BF9600F481A8 /* PhoneNumber.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = PhoneNumber.m; path = ../PhoneNumber.m; sourceTree = "<group>"; };
+		75DB5C311896BF9600F481A8 /* Contact.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Contact.h; path = ../Contact.h; sourceTree = "<group>"; };
+		75DB5C321896BF9600F481A8 /* Contact.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = Contact.m; path = ../Contact.m; sourceTree = "<group>"; };
+		75DB5C341896BF9600F481A8 /* Group.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Group.h; path = ../Group.h; sourceTree = "<group>"; };
+		75DB5C351896BF9600F481A8 /* Group.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = Group.m; path = ../Group.m; sourceTree = "<group>"; };
+		75DB5C371896BF9600F481A8 /* User.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = User.h; path = ../User.h; sourceTree = "<group>"; };
+		75DB5C381896BF9600F481A8 /* User.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = User.m; path = ../User.m; sourceTree = "<group>"; };
+		75DB5C3A1896BF9600F481A8 /* Address.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Address.h; path = ../Address.h; sourceTree = "<group>"; };
+		75DB5C3B1896BF9600F481A8 /* Address.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = Address.m; path = ../Address.m; sourceTree = "<group>"; };
+		75DB5C3D1896BF9600F481A8 /* DataVersion.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = DataVersion.h; path = ../DataVersion.h; sourceTree = "<group>"; };
+		75DB5C3E1896BF9600F481A8 /* DataVersion.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = DataVersion.m; path = ../DataVersion.m; sourceTree = "<group>"; };
+		75FD449E1896B7CA0009B95D /* NSString+StringTools.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "NSString+StringTools.h"; sourceTree = "<group>"; };
+		75FD449F1896B7CA0009B95D /* NSString+StringTools.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "NSString+StringTools.m"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -137,13 +146,13 @@
 				37D93CA7166E801700026ED5 /* NSManagedObject+FindMethods.h */,
 				37D93CA8166E801700026ED5 /* NSManagedObject+FindMethods.m */,
 				37D93CA0166E7D8500026ED5 /* NSManagedObjectContextHolder.h */,
-				37D93C95166E6EA400026ED5 /* NSManagedObject+FromDictionary.h */,
 				37D93CA1166E7D8E00026ED5 /* NSManagedObject+SyncTimestamp.h */,
 				37D93CA2166E7D8E00026ED5 /* NSManagedObject+SyncTimestamp.m */,
+				37D93C95166E6EA400026ED5 /* NSManagedObject+FromDictionary.h */,
 				37D93C96166E6EA400026ED5 /* NSManagedObject+FromDictionary.m */,
 				37D93C91166E6E6100026ED5 /* RegexKitLite */,
-				37D93C8E166E6DBA00026ED5 /* NSString+CamelCaseConversion.h */,
-				37D93C8F166E6DBA00026ED5 /* NSString+CamelCaseConversion.m */,
+				75FD449E1896B7CA0009B95D /* NSString+StringTools.h */,
+				75FD449F1896B7CA0009B95D /* NSString+StringTools.m */,
 				37D93C8C166E5C9500026ED5 /* NSManagedObject+Convenients.h */,
 				37D93C89166E5BE200026ED5 /* NSManagedObject+TemporaryObject.h */,
 				37D93C8A166E5BE200026ED5 /* NSManagedObject+TemporaryObject.m */,
@@ -237,13 +246,19 @@
 		37D93CC3166E8C3500026ED5 /* Models */ = {
 			isa = PBXGroup;
 			children = (
-				37D93CCA166E8C4000026ED5 /* User.h */,
-				37D93CCB166E8C4000026ED5 /* User.m */,
-				37D93CC7166E8C4000026ED5 /* DataVersion.h */,
-				37D93CC8166E8C4000026ED5 /* DataVersion.m */,
-				37D93CC4166E8C4000026ED5 /* Group.h */,
-				37D93CC5166E8C4000026ED5 /* Group.m */,
 				37D93CCD166E8CA000026ED5 /* Models.h */,
+				75DB5C3D1896BF9600F481A8 /* DataVersion.h */,
+				75DB5C3E1896BF9600F481A8 /* DataVersion.m */,
+				75DB5C3A1896BF9600F481A8 /* Address.h */,
+				75DB5C3B1896BF9600F481A8 /* Address.m */,
+				75DB5C371896BF9600F481A8 /* User.h */,
+				75DB5C381896BF9600F481A8 /* User.m */,
+				75DB5C341896BF9600F481A8 /* Group.h */,
+				75DB5C351896BF9600F481A8 /* Group.m */,
+				75DB5C311896BF9600F481A8 /* Contact.h */,
+				75DB5C321896BF9600F481A8 /* Contact.m */,
+				75DB5C2E1896BF9600F481A8 /* PhoneNumber.h */,
+				75DB5C2F1896BF9600F481A8 /* PhoneNumber.m */,
 			);
 			name = Models;
 			sourceTree = "<group>";
@@ -357,20 +372,23 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				75DB5C391896BF9600F481A8 /* User.m in Sources */,
 				37D93C76166E5B9B00026ED5 /* main.m in Sources */,
+				75DB5C3C1896BF9600F481A8 /* Address.m in Sources */,
 				37D93C7A166E5B9B00026ED5 /* AppDelegate.m in Sources */,
+				75DB5C301896BF9600F481A8 /* PhoneNumber.m in Sources */,
 				37D93C83166E5B9B00026ED5 /* Sample.xcdatamodeld in Sources */,
+				75DB5C331896BF9600F481A8 /* Contact.m in Sources */,
 				37D93C8B166E5BE200026ED5 /* NSManagedObject+TemporaryObject.m in Sources */,
-				37D93C90166E6DBA00026ED5 /* NSString+CamelCaseConversion.m in Sources */,
 				37D93C94166E6E6100026ED5 /* RegexKitLite.m in Sources */,
 				37D93C97166E6EA400026ED5 /* NSManagedObject+FromDictionary.m in Sources */,
 				37D93C9C166E7C1100026ED5 /* NSManagedObjectContext+OnelineFetch.m in Sources */,
 				37D93CA3166E7DBB00026ED5 /* NSManagedObject+SyncTimestamp.m in Sources */,
 				37D93CA6166E7F7100026ED5 /* NSManagedObject+Save.m in Sources */,
 				37D93CA9166E801700026ED5 /* NSManagedObject+FindMethods.m in Sources */,
-				37D93CC6166E8C4000026ED5 /* Group.m in Sources */,
-				37D93CC9166E8C4000026ED5 /* DataVersion.m in Sources */,
-				37D93CCC166E8C4000026ED5 /* User.m in Sources */,
+				75DB5C361896BF9600F481A8 /* Group.m in Sources */,
+				75FD44A01896B7CA0009B95D /* NSString+StringTools.m in Sources */,
+				75DB5C3F1896BF9600F481A8 /* DataVersion.m in Sources */,
 				37D93CD0166E98FB00026ED5 /* NSManagedObject+Delete.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -542,6 +560,7 @@
 				37D93C88166E5B9B00026ED5 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 		37D93CBE166E895A00026ED5 /* Build configuration list for PBXNativeTarget "NSManagedObject Goodies Test" */ = {
 			isa = XCConfigurationList;
@@ -550,6 +569,7 @@
 				37D93CC0166E895A00026ED5 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 
diff --git a/Sample/Sample/Models.h b/Sample/Sample/Models.h
index 82ecfe2..6ed5f6c 100644
--- a/Sample/Sample/Models.h
+++ b/Sample/Sample/Models.h
@@ -12,5 +12,8 @@
 #import "Group.h"
 #import "User.h"
 #import "DataVersion.h"
+#import "Contact.h"
+#import "PhoneNumber.h"
+#import "Address.h"
 
 #endif
diff --git a/Sample/Sample/Sample.xcdatamodeld/Sample.xcdatamodel/contents b/Sample/Sample/Sample.xcdatamodeld/Sample.xcdatamodel/contents
index f02ac89..31158bd 100644
--- a/Sample/Sample/Sample.xcdatamodeld/Sample.xcdatamodel/contents
+++ b/Sample/Sample/Sample.xcdatamodeld/Sample.xcdatamodel/contents
@@ -1,5 +1,16 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<model name="" userDefinedModelVersionIdentifier="" type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="1811" systemVersion="12C60" minimumToolsVersion="Automatic" macOSVersion="Automatic" iOSVersion="Automatic">
+<model userDefinedModelVersionIdentifier="" type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="3401" systemVersion="13B3116" minimumToolsVersion="Automatic" macOSVersion="Automatic" iOSVersion="Automatic">
+    <entity name="Address" representedClassName="Address" syncable="YES">
+        <attribute name="city" optional="YES" attributeType="String" syncable="YES"/>
+        <attribute name="state" optional="YES" attributeType="String" syncable="YES"/>
+        <relationship name="contact" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Contact" inverseName="address" inverseEntity="Contact" syncable="YES"/>
+    </entity>
+    <entity name="Contact" representedClassName="Contact" syncable="YES">
+        <attribute name="age" optional="YES" attributeType="Double" defaultValueString="0.0" syncable="YES"/>
+        <attribute name="name" optional="YES" attributeType="String" syncable="YES"/>
+        <relationship name="address" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Address" inverseName="contact" inverseEntity="Address" syncable="YES"/>
+        <relationship name="phoneNumbers" optional="YES" toMany="YES" deletionRule="Nullify" destinationEntity="PhoneNumber" inverseName="contact" inverseEntity="PhoneNumber" syncable="YES"/>
+    </entity>
     <entity name="DataVersion" representedClassName="DataVersion" syncable="YES">
         <attribute name="modelName" optional="YES" attributeType="String" syncable="YES"/>
         <attribute name="timestamp" optional="YES" attributeType="Integer 64" defaultValueString="0" syncable="YES"/>
@@ -9,13 +20,21 @@
         <attribute name="id" optional="YES" attributeType="Integer 64" defaultValueString="0" syncable="YES"/>
         <attribute name="title" optional="YES" attributeType="String" syncable="YES"/>
     </entity>
+    <entity name="PhoneNumber" representedClassName="PhoneNumber" syncable="YES">
+        <attribute name="number" optional="YES" attributeType="Double" minValueString="0" defaultValueString="0.0" syncable="YES"/>
+        <attribute name="type" optional="YES" attributeType="String" syncable="YES"/>
+        <relationship name="contact" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Contact" inverseName="phoneNumbers" inverseEntity="Contact" syncable="YES"/>
+    </entity>
     <entity name="User" representedClassName="User" syncable="YES">
         <attribute name="emails" optional="YES" attributeType="Binary" syncable="YES"/>
         <attribute name="name" optional="YES" attributeType="String" syncable="YES"/>
     </entity>
     <elements>
-        <element name="DataVersion" positionX="160" positionY="192" width="128" height="75"/>
-        <element name="Group" positionX="160" positionY="192" width="128" height="90"/>
-        <element name="User" positionX="160" positionY="192" width="128" height="75"/>
+        <element name="Address" positionX="-191" positionY="288" width="128" height="88"/>
+        <element name="Contact" positionX="16" positionY="323" width="128" height="103"/>
+        <element name="DataVersion" positionX="160" positionY="192" width="128" height="73"/>
+        <element name="Group" positionX="9" positionY="144" width="128" height="88"/>
+        <element name="PhoneNumber" positionX="-189" positionY="423" width="128" height="88"/>
+        <element name="User" positionX="-63" positionY="36" width="128" height="75"/>
     </elements>
 </model>
\ No newline at end of file
diff --git a/Sample/Sample/User.h b/Sample/User.h
similarity index 71%
rename from Sample/Sample/User.h
rename to Sample/User.h
index 252290f..b76ac6b 100644
--- a/Sample/Sample/User.h
+++ b/Sample/User.h
@@ -2,8 +2,8 @@
 //  User.h
 //  Sample
 //
-//  Created by Jaehwa Han on 12/4/12.
-//  Copyright (c) 2012 Jaehwa Han. All rights reserved.
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
 //
 
 #import <Foundation/Foundation.h>
@@ -12,7 +12,7 @@
 
 @interface User : NSManagedObject
 
-@property (nonatomic, retain) NSString * name;
 @property (nonatomic, retain) NSData * emails;
+@property (nonatomic, retain) NSString * name;
 
 @end
diff --git a/Sample/Sample/User.m b/Sample/User.m
similarity index 54%
rename from Sample/Sample/User.m
rename to Sample/User.m
index 949fa95..fd551a8 100644
--- a/Sample/Sample/User.m
+++ b/Sample/User.m
@@ -2,8 +2,8 @@
 //  User.m
 //  Sample
 //
-//  Created by Jaehwa Han on 12/4/12.
-//  Copyright (c) 2012 Jaehwa Han. All rights reserved.
+//  Created by amir hayek on 1/27/14.
+//  Copyright (c) 2014 Jaehwa Han. All rights reserved.
 //
 
 #import "User.h"
@@ -11,7 +11,7 @@
 
 @implementation User
 
-@dynamic name;
 @dynamic emails;
+@dynamic name;
 
 @end
diff --git a/Sources/NSManagedObject+Convenients.h b/Sources/NSManagedObject+Convenients.h
index 189682a..3273c2a 100644
--- a/Sources/NSManagedObject+Convenients.h
+++ b/Sources/NSManagedObject+Convenients.h
@@ -16,7 +16,7 @@
 #import "NSManagedObject+Delete.h"
 #import "NSManagedObject+FromDictionary.h"
 #import "NSManagedObject+SyncTimestamp.h"
-#import "NSString+CamelCaseConversion.h"
+#import "NSString+StringTools.h"
 #import "NSManagedObjectContext+OnelineFetch.h"
 
 #endif
diff --git a/Sources/NSManagedObject+FromDictionary.h b/Sources/NSManagedObject+FromDictionary.h
index ab8b72b..ddc18e5 100644
--- a/Sources/NSManagedObject+FromDictionary.h
+++ b/Sources/NSManagedObject+FromDictionary.h
@@ -9,8 +9,13 @@
 #import <CoreData/CoreData.h>
 
 @interface NSManagedObject (FromDictionary)
-+ (id)insertWithDictionary:(NSDictionary *)dict error:(NSError **)error commit:(BOOL)commit;
-+ (id)insertWithDictionary:(NSDictionary *)dict uniqueKey:(NSString *)key error:(NSError **)error commit:(BOOL)commit;
+
++ (id)newWithJsonData:(NSData*)jsonData error:(NSError**)error commit:(BOOL)commit;
++ (id)newWithJsonString:(NSString*)json error:(NSError**)error commit:(BOOL)commit;
++ (id)newWithId:(id)object error:(NSError**)error commit:(BOOL)commit;
++ (id)newWithArray:(NSArray *)array error:(NSError **)error commit:(BOOL)commit;
++ (id)newWithDictionary:(NSDictionary *)dict error:(NSError **)error commit:(BOOL)commit;
++ (id)newWithDictionary:(NSDictionary *)dict uniqueKey:(NSString *)key error:(NSError **)error commit:(BOOL)commit;
 
 + (id)updateWithDictionary:(NSDictionary *)dict commit:(BOOL)commit;
 + (id)updateWithDictionary:(NSDictionary *)dict error:(NSError **)error commit:(BOOL)commit;
diff --git a/Sources/NSManagedObject+FromDictionary.m b/Sources/NSManagedObject+FromDictionary.m
index 2534968..e1b5d0d 100644
--- a/Sources/NSManagedObject+FromDictionary.m
+++ b/Sources/NSManagedObject+FromDictionary.m
@@ -7,7 +7,7 @@
 //
 
 #import "NSManagedObject+FromDictionary.h"
-#import "NSString+CamelCaseConversion.h"
+#import "NSString+StringTools.h"
 #import <objc/runtime.h>
 #import "RegexKitLite.h"
 #import "NSManagedObjectContextHolder.h"
@@ -73,16 +73,85 @@ - (void)updateWithDictionary:(NSDictionary *)dict
                 }
             }
             
-            //// 2) NSArray convert
+            //// 2) NSArray to NSData convert
             else if ([propertyAttributes hasPrefix:@"T@\"NSData\""] && [val isKindOfClass:[NSArray class]]) {
                 val = [NSKeyedArchiver archivedDataWithRootObject:val];
             }
+
+            //// 3) NSArray to Custom Class convert
+            else if ([propertyAttributes hasPrefix:@"T@\""] && [val isKindOfClass:[NSArray class]]) {
+                NSMutableArray* valArray = [NSMutableArray arrayWithCapacity:[(NSArray*)val count]];
+                for (id object in val) {
+                    if ([object isKindOfClass:[NSDictionary class]]) {
+                        NSString* fixedKey = [[key pluralToSingle] capitalizeFirstLetter];
+                        id newObject = [NSClassFromString(fixedKey) newWithDictionary:object error:nil commit:YES];
+                        [valArray addObject:newObject];
+                        
+                        [newObject setValue:self forKey:[NSStringFromClass(self.class) lowercaseString]];
+                    }else{
+                        [valArray addObject:object];
+                    }
+                }
+                val = [NSSet setWithArray:valArray];
+                
+            }
+
+            //// 2) NSDictionary to Custom Class convert
+            else if ([propertyAttributes hasPrefix:@"T@\""] && [val isKindOfClass:[NSDictionary class]]) {
+                NSString* fixedKey = [key capitalizeFirstLetter];
+                val = [NSClassFromString(fixedKey) newWithDictionary:val error:nil commit:YES];
+                [val setValue:self forKey:[NSStringFromClass(self.class) lowercaseString]];
+            }
+            
             [self setValue:val forKey:key];
         }
     }
 }
 
-+ (id)insertWithDictionary:(NSDictionary *)dict error:(NSError **)error commit:(BOOL)commit
++ (id)newWithJsonString:(NSString*)jsonString error:(NSError**)error commit:(BOOL)commit
+{
+    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
+    
+    return [self newWithJsonData:jsonData error:error commit:commit];
+}
+
++ (id)newWithJsonData:(NSData*)jsonData error:(NSError**)error commit:(BOOL)commit;
+{
+    if ([NSJSONSerialization isValidJSONObject:jsonData]) {
+        id jsonObject = [NSJSONSerialization JSONObjectWithData: jsonData options: NSJSONReadingMutableContainers error: error];
+        
+        return [self newWithId:jsonObject error:error commit:commit];
+    }
+    
+    *error = [NSError errorWithDomain:@"NSManagedObject+FromDictionary" code:406 userInfo:[NSDictionary dictionaryWithObject:@"Invalid JSON object" forKey:@"error"]];
+    
+    return nil;
+}
+
++ (id)newWithId:(id)object error:(NSError**)error commit:(BOOL)commit
+{
+    if ([object isKindOfClass:[NSDictionary class]]) {
+        return [self newWithDictionary:object error:error commit:commit];
+    }
+
+    if ([object isKindOfClass:[NSArray class]]) {
+        return [self newWithArray:object error:error commit:commit];
+    }
+    
+    *error = [NSError errorWithDomain:@"NSManagedObject+FromDictionary" code:406 userInfo:[NSDictionary dictionaryWithObject:@"Object type not supported" forKey:@"error"]];
+    
+    return nil;
+}
+
+
++ (id)newWithArray:(NSArray *)array error:(NSError **)error commit:(BOOL)commit
+{
+    NSDictionary* dict = [NSDictionary dictionaryWithObject:array forKey:NSStringFromClass([self class])];
+   
+    return [self newWithDictionary:dict error:error commit:commit];
+}
+
++ (id)newWithDictionary:(NSDictionary *)dict error:(NSError **)error commit:(BOOL)commit
 {
     NSManagedObjectContext *context = [(id<NSManagedObjectContextHolder>)[[UIApplication sharedApplication] delegate] managedObjectContext];
     NSManagedObject *instance = [NSEntityDescription insertNewObjectForEntityForName:NSStringFromClass([self class]) inManagedObjectContext:context];
@@ -97,12 +166,12 @@ + (id)insertWithDictionary:(NSDictionary *)dict error:(NSError **)error commit:(
     return [NSPredicate predicateWithFormat:@"SELF.%K == %@", key, value];
 }
 
-+ (id)insertWithDictionary:(NSDictionary *)dict uniqueKey:(NSString *)key error:(NSError **)error commit:(BOOL)commit
++ (id)newWithDictionary:(NSDictionary *)dict uniqueKey:(NSString *)key error:(NSError **)error commit:(BOOL)commit
 {
     NSArray *arr = [self findWithPredicate:equalPredicate(key, dict[key])];
     if (arr.count == 0) {
         //insert new one
-        return [self insertWithDictionary:dict error:error commit:commit];
+        return [self newWithDictionary:dict error:error commit:commit];
     } else {
         *error = nil;
         return nil;
@@ -159,7 +228,7 @@ + (id)updateWithDictionary:(NSDictionary *)dict uniqueKeys:(NSArray *)keys upser
 
     if (arr.count == 0) {
         if (upsert) //insert new one
-            return [self insertWithDictionary:dict error:error commit:commit];
+            return [self newWithDictionary:dict error:error commit:commit];
         else {
             *error = nil;
             return nil;
@@ -181,7 +250,7 @@ + (id)updateWithDictionary:(NSDictionary *)dict uniqueKey:(NSString *)key upsert
     
     if (arr.count == 0) {
         if (upsert) //insert new one
-            return [self insertWithDictionary:dict error:error commit:commit];
+            return [self newWithDictionary:dict error:error commit:commit];
         else {
             *error = nil;
             return nil;
diff --git a/Sources/NSString+CamelCaseConversion.m b/Sources/NSString+CamelCaseConversion.m
deleted file mode 100644
index 4d9aff4..0000000
--- a/Sources/NSString+CamelCaseConversion.m
+++ /dev/null
@@ -1,28 +0,0 @@
-//
-//  NSString+CamelCaseConversion.m
-//  Sample
-//
-//  Created by Jaehwa Han on 12/4/12.
-//  Copyright (c) 2012 Jaehwa Han. All rights reserved.
-//
-
-#import "NSString+CamelCaseConversion.h"
-#import "RegexKitLite.h"
-
-@implementation NSString (CamelCaseConversion)
-- (NSString *)toCamelCase
-{
-    return [self stringByReplacingOccurrencesOfRegex:@"_([a-zA-Z0-9]+)" usingBlock:^NSString *(NSInteger captureCount, NSString * const capturedStrings[captureCount], const NSRange capturedRanges[captureCount], volatile BOOL * const stop) {
-        return [capturedStrings[1] capitalizedString];
-    }];
-}
-
-- (NSString *)toUnderscore
-{
-    return [self stringByReplacingOccurrencesOfRegex:@"[A-Z]" usingBlock:^NSString *(NSInteger captureCount, NSString * const capturedStrings[captureCount], const NSRange capturedRanges[captureCount], volatile BOOL * const stop) {
-        unichar cs[2] = {(unichar)'_', [capturedStrings[0] characterAtIndex:0] + 32};
-        return [NSString stringWithCharacters:cs length:2];
-    }];
-}
-
-@end