Exclude keys form being mapped into a dictionary

OCMapper.podspec

@@ -1,15 +1,15 @@
 Pod::Spec.new do |s|
     s.platform = :ios, '5.0'
     s.name = 'OCMapper'
-    s.version = '1.5'
+    s.version = '1.6'
     s.summary = 'NSDictionary to NSObject Mapper'
     s.homepage = 'https://github.com/aryaxt/OCMapper'
     s.license = {
       :type => 'MIT',
       :file => 'License.txt'
     }
     s.author = {'Aryan Ghassemi' => 'https://github.com/aryaxt/OCMapper'}
-    s.source = {:git => 'https://github.com/aryaxt/OCMapper.git', :tag => '1.5'}
+    s.source = {:git => 'https://github.com/aryaxt/OCMapper.git', :tag => '1.6'}
     s.source_files = 'OCMapper/Source/*.{h,m}','OCMapper/Source/Categories/*.{h,m}','OCMapper/Source/Logging Provider/*.{h,m}','OCMapper/Source/Instance Provider/*.{h,m}','OCMapper/Source/Mapping Provider/*.{h,m}','OCMapper/Source/Mapping Provider/In Code Mapping/*.{h,m}','OCMapper/Source/Mapping Provider/PLIST Mapping/*.{h,m}','OCMapper/Source/Mapping Provider/XML Mapping/*.{h,m}' 
     s.framework = 'Foundation'
     s.requires_arc = true

OCMapper/Source/Mapping Provider/In Code Mapping/InCodeMappingProvider.h

@@ -88,6 +88,14 @@
  */
 - (void)mapFromPropertyKey:(NSString *)propertyKey toDictionaryKey:(NSString *)dictionaryKey forClass:(Class)class withTransformer:(MappingTransformer)transformer;
 
+/**
+ *  Set keys to be excluded when mapping model to a dictionary
+ *
+ *  @param class        Class to be assign mapping to
+ *  @param keys         NSArray of NSStrings, include properties to be excluded when mapping
+ */
+- (void)excludeMappingForClass:(Class)class withKeys:(NSArray *)keys;
+
 /**
  *  Set dateformatter to be used for converting a dictionary to a model object
  *

OCMapper/Source/Mapping Provider/In Code Mapping/InCodeMappingProvider.m

@@ -34,6 +34,7 @@ @interface InCodeMappingProvider()
 @property (nonatomic, strong) NSMutableDictionary *inverseMappingDictionary;
 @property (nonatomic, strong) NSMutableDictionary *dateFormatterDictionary;
 @property (nonatomic, strong) NSMutableDictionary *inverseDateFormatterDictionary;
+@property (nonatomic, strong) NSMutableDictionary *excludeKeysDictionary;
 @end
 
 @implementation InCodeMappingProvider
@@ -51,6 +52,7 @@ - (id)init
 		self.inverseMappingDictionary = [NSMutableDictionary dictionary];
 		self.dateFormatterDictionary = [NSMutableDictionary dictionary];
 		self.inverseDateFormatterDictionary = [NSMutableDictionary dictionary];
+        self.excludeKeysDictionary = [NSMutableDictionary dictionary];
 	}
 
 	return self;
@@ -94,6 +96,11 @@ - (void)mapFromPropertyKey:(NSString *)propertyKey toDictionaryKey:(NSString *)d
 	[self.inverseMappingDictionary setObject:info forKey:key];
 }
 
+- (void)excludeMappingForClass:(Class)class withKeys:(NSArray *)keys
+{
+    [self.excludeKeysDictionary setObject:keys forKey:NSStringFromClass(class)];
+}
+
 - (void)setDateFormatter:(NSDateFormatter *)dateFormatter forPropertyKey:(NSString *)property andClass:(Class)class
 {
 	NSString *key = [self uniqueKeyForClass:class andKey:property];
@@ -143,4 +150,9 @@ - (NSDateFormatter *)dateFormatterForClass:(Class)class andDictionaryKey:(NSStri
 	return [self.dateFormatterDictionary objectForKey:key];
 }
 
+- (NSArray *)excludedKeysForClass:(Class)class
+{
+    return [self.excludeKeysDictionary objectForKey:NSStringFromClass(class)];
+}
+
 @end

OCMapper/Source/Mapping Provider/MappingProvider.h

@@ -34,5 +34,6 @@
 - (ObjectMappingInfo *)mappingInfoForClass:(Class)class andPropertyKey:(NSString *)key;
 - (NSDateFormatter *)dateFormatterForClass:(Class)class andPropertyKey:(NSString *)key;
 - (NSDateFormatter *)dateFormatterForClass:(Class)class andDictionaryKey:(NSString *)key;
+- (NSArray *)excludedKeysForClass:(Class)class;
 
 @end

OCMapper/Source/ObjectMapper.m

@@ -182,11 +182,17 @@ - (id)processDictionaryFromObject:(NSObject *)object
 	{
 		unsigned int outCount, i;
 		objc_property_t *properties = class_copyPropertyList(currentClass, &outCount);
+        NSArray *excludedKeys = [self.mappingProvider excludedKeysForClass:currentClass];
 
 		for (i = 0; i < outCount; i++)
 		{
 			objc_property_t property = properties[i];
 			NSString *originalPropertyName = [NSString stringWithUTF8String:property_getName(property)];
+
+            if (excludedKeys && [excludedKeys containsObject:originalPropertyName]) {
+                continue;
+            }
+
 			Class class = NSClassFromString([self typeForProperty:originalPropertyName andClass:[object class]]);
 			id propertyValue = [object valueForKey:(NSString *)originalPropertyName];
 

OCMapperTests/ObjectMapperTests.m

@@ -454,6 +454,46 @@ - (void)testShouldNotAutomaticallyGenerateInverseMapping
 	XCTAssertNil(info);
 }
 
+- (void)testShouldMapArrayOfStringFromDictionaryToObject
+{
+	NSMutableDictionary *userDictionary = [NSMutableDictionary dictionary];
+	[userDictionary setObject:@[@"keyword1", @2] forKey:@"randomKeywords"];
+
+	User *user = [self.mapper objectFromSource:userDictionary toInstanceOfClass:[User class]];
+	XCTAssertTrue(user.randomKeywords.count == 2);
+	XCTAssertTrue([user.randomKeywords[0] isEqualToString:@"keyword1"]);
+	XCTAssertTrue([user.randomKeywords[1] isEqualToNumber:@2]);
+}
+
+- (void)testShouldMapArrayOfStringFromObjectToDictionary
+{
+	User *user = [[User alloc] init];
+	user.randomKeywords = @[@"keyword1", @2].mutableCopy;
+
+	NSDictionary *dictionary = [self.mapper dictionaryFromObject:user];
+	NSArray *array = [dictionary objectForKey:@"randomKeywords"];
+
+	XCTAssertTrue(array.count == 2);
+	XCTAssertTrue([array[0] isEqualToString:@"keyword1"]);
+	XCTAssertTrue([array[1] isEqualToNumber:@2]);
+}
+
+- (void)testShouldNotMapExcludedKeys {
+    User *user = [[User alloc] init];
+    user.firstName = @"f";
+    user.lastName = @"l";
+    user.age = @28;
+    user.dateOfBirth = [NSDate date];
+
+    [self.mappingProvider excludeMappingForClass:User.class withKeys:@[@"age", @"lastName"]];
+
+    NSDictionary *dictionary = [self.mapper dictionaryFromObject:user];
+    XCTAssertNotNil(dictionary[@"firstName"]);
+    XCTAssertNotNil(dictionary[@"dateOfBirth"]);
+    XCTAssertNil(dictionary[@"age"]);
+    XCTAssertNil(dictionary[@"lastName"]);
+}
+
 - (void)testObjectInstanceProviderShouldReturnTrueForNSObjectSubclasses
 {
 	XCTAssertTrue([self.instanceProvider canHandleClass:User.class]);