add source's pointer, parameter

Classes/JSONAPIErrorResource.h

@@ -21,7 +21,11 @@
 @property (nonatomic, strong) NSString *detail;
 @property (nonatomic, strong) NSArray *links;
 @property (nonatomic, strong) NSArray *paths;
+@property (nonatomic, strong) NSDictionary *source;
 
 - (instancetype) initWithDictionary:(NSDictionary*)dictionary;
 
+- (NSString *)sourcePointer;
+- (NSString *)sourceParameter;
+
 @end

Classes/JSONAPIErrorResource.m

@@ -24,9 +24,36 @@ - (instancetype) initWithDictionary:(NSDictionary*)dictionary {
         _detail = dictionary[@"detail"];
         _links = dictionary[@"links"];
         _paths = dictionary[@"paths"];
+        _source = dictionary[@"source"];
     }
 
     return self;
 }
 
+- (NSString *)sourcePointer
+{
+    if (self.source) {
+        NSString *pointer = self.source[@"pointer"];
+
+        if (pointer) {
+            return pointer;
+        }
+    }
+
+    return nil;
+}
+
+- (NSString *)sourceParameter
+{
+    if (self.source) {
+        NSString *parameter = self.source[@"parameter"];
+
+        if (parameter) {
+            return parameter;
+        }
+    }
+
+    return nil;
+}
+
 @end

Project/JSONAPITests/error_example.json

@@ -9,13 +9,16 @@
     },
     "data": [],
     "errors": [{
-                 "id": "123456",
-                 "href": "/internet/is/fun",
-                 "status": "400",
-                 "code": "123abc",
-                 "title": "some title",
-                 "detail": "some detail",
-                 "links": ["a_link"],
-                 "source": ["a_path"]
-                 }]
-}
+               "id": "123456",
+               "href": "/internet/is/fun",
+               "status": "400",
+               "code": "123abc",
+               "title": "some title",
+               "detail": "some detail",
+               "links": ["a_link"],
+               "source": {
+                          "pointer": "/some/point",
+                          "parameter": "a_parameter"
+                          }
+               }]
+}