implement method for converting underscore properties to camel case. …

…Bump podspec.

EasyMapping.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "EasyMapping"
-  s.version      = "0.17.1"
+  s.version      = "0.18.0"
   s.summary      = "The easiest way to map data from your webservice."
   s.homepage     = "https://github.com/lucasmedeirosleite/EasyMapping"
   s.license      = { :type => 'MIT', :file => 'LICENSE' }

EasyMapping/EKObjectMapping.h

@@ -58,7 +58,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  Root JSON path. This is helpful, when all object data is inside another JSON dictionary.
  */
-@property (nonatomic, strong, readonly) NSString *rootPath;
+@property (nonatomic, strong, readonly, nullable) NSString *rootPath;
 
 /**
  Dictionary, containing property mappings for current object.
@@ -131,7 +131,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)mapKeyPath:(NSString *)keyPath toProperty:(NSString *)property;
 
 /**
- Map JSON keyPath to object property. This method assumes, that value contains NSString, that can be transformed into NSDate by NSDateFormatter. You can get current thread date formatter by using NSDateFormatter+EasyMappingAdditions category. Default timezone is GMT. Default date format ISO 8601.
+ Map JSON keyPath to object property. This method assumes, that value contains NSString, that can be transformed into NSDate by NSDateFormatter.
  
  @param keyPath JSON keypath, that will be used by valueForKeyPath: method
  
@@ -155,6 +155,13 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (void)mapPropertiesFromArrayToPascalCase:(NSArray *)propertyNamesArray;
 
+/**
+ Maps properties from array, making all keypaths that contain underscores - camel cased. For example, @"created_at" field in JSON will be mapped to @"createdAt" property on your model.
+ 
+ @param propertyNamesArray Array of property names.
+ */
+- (void)mapPropertiesFromUnderscoreToCamelCase:(NSArray *)propertyNamesArray;
+
 /**
  Maps properties from dictionary. Keys are keypaths in JSON, values are names of properties.
  

EasyMapping/EKObjectMapping.m

@@ -26,6 +26,7 @@
 #import "EKRelationshipMapping.h"
 #import "EKMappingProtocol.h"
 #import "NSDateFormatter+EasyMappingAdditions.h"
+#import "EKpropertyHelper.h"
 
 @implementation EKObjectMapping
 
@@ -119,6 +120,15 @@ -(void)mapPropertiesFromArrayToPascalCase:(NSArray *)propertyNamesArray
     }
 }
 
+- (void)mapPropertiesFromUnderscoreToCamelCase:(NSArray *)propertyNamesArray
+{
+    for (NSString *key in propertyNamesArray) {
+        NSString *convertedKey = [EKPropertyHelper convertStringFromUnderScoreToCamelCase: key];
+
+        [self mapKeyPath:key toProperty:convertedKey];
+    }
+}
+
 - (void)mapPropertiesFromDictionary:(NSDictionary *)propertyDictionary
 {
     NSParameterAssert([propertyDictionary isKindOfClass:[NSDictionary class]]);

EasyMapping/EKPropertyHelper.h

@@ -65,6 +65,8 @@ NS_ASSUME_NONNULL_BEGIN
 + (nullable NSDictionary *)extractRootPathFromExternalRepresentation:(NSDictionary *)externalRepresentation
                                                          withMapping:(EKObjectMapping *)mapping;
 
++ (NSString *)convertStringFromUnderScoreToCamelCase:(NSString *)string;
+
 @end
 
 NS_ASSUME_NONNULL_END

EasyMapping/EKPropertyHelper.m

@@ -217,4 +217,21 @@ + (NSDictionary *)extractRootPathFromExternalRepresentation:(NSDictionary *)exte
     }
     return externalRepresentation;
 }
+
++ (NSString *)convertStringFromUnderScoreToCamelCase:(NSString *)string {
+    NSMutableString *output = [NSMutableString string];
+    BOOL makeNextCharacterUpperCase = NO;
+    for (NSInteger idx = 0; idx < [string length]; idx += 1) {
+        unichar c = [string characterAtIndex:idx];
+        if (c == '_') {
+            makeNextCharacterUpperCase = YES;
+        } else if (makeNextCharacterUpperCase) {
+            [output appendString:[[NSString stringWithCharacters:&c length:1] uppercaseString]];
+            makeNextCharacterUpperCase = NO;
+        } else {
+            [output appendFormat:@"%C", c];
+        }
+    }
+    return output;
+}
 @end

EasyMapping/NSDateFormatter+EasyMappingAdditions.h

@@ -42,7 +42,7 @@ static NSString * const EKISO_8601DateTimeFormat = @"yyyy-MM-dd";
 /**
  NSDateFormatter instance for current NSThread. It is lazily constructed, default date format - ISO 8601.
  
- Thos property is deprecated and stated to be removed in release for Xcode 8, which drops support for iOS 7 and lower.
+ Thos property is deprecated and slated to be removed in release for Xcode 8, which drops support for iOS 7 and lower.
  */
 + (NSDateFormatter *)ek_formatterForCurrentThread DEPRECATED_ATTRIBUTE;
 

EasyMappingExample/Tests/Specs/EKObjectMappingSpec.m

@@ -359,6 +359,60 @@
 
     });
 
+    describe(@"#mapPropertiesFromUnderscoreToCamelCase", ^{
+
+        __block EKObjectMapping *mapping;
+
+        beforeEach(^{
+            mapping = [[EKObjectMapping alloc] initWithObjectClass:[Car class]];
+            [mapping mapPropertiesFromUnderscoreToCamelCase:@[@"model", @"year", @"created_at",@"car_id"]];
+        });
+
+        describe(@"createdAt field", ^{
+
+            __block EKPropertyMapping *propertyMapping;
+
+            beforeEach(^{
+                propertyMapping = [mapping.propertyMappings objectForKey:@"created_at"];
+            });
+
+            specify(^{
+                [[propertyMapping shouldNot] beNil];
+            });
+
+            specify(^{
+                [[propertyMapping.keyPath should] equal:@"created_at"];
+            });
+
+            specify(^{
+                [[propertyMapping.property should] equal:@"createdAt"];
+            });
+        });
+
+        describe(@"car_id field", ^{
+
+            __block EKPropertyMapping *propertyMapping;
+
+            beforeEach(^{
+                propertyMapping = [mapping.propertyMappings objectForKey:@"car_id"];
+            });
+
+            specify(^{
+                [[propertyMapping shouldNot] beNil];
+            });
+
+            specify(^{
+                [[propertyMapping.keyPath should] equal:@"car_id"];
+            });
+
+            specify(^{
+                [[propertyMapping.property should] equal:@"carId"];
+            });
+
+        });
+
+    });
+
 
     describe(@"#mapPropertiesFromDictionary", ^{