Support Multi-Keys

README-CN.md

@@ -306,6 +306,29 @@ func mapping(map: Map) {
 }
 ```
 
+# 支持多个Key
+有些JSON相同意义的Value对应了多个不同的Key。例如：
+第一个JSON:
+```json
+{
+    "code" : 200,
+    "message" : "success"
+}
+```
+第二个JSON:
+```json
+{
+    "code" : 200,
+    "msg" : "success"
+}
+```
+对于'success'的值, 你可以像这样来访问它:
+```swift
+func mapping(map: Map) {
+    identifier <- map["message|msg", nested: false, delimiter: "|"]
+}
+```
+
 # 自定义转换规则
 ObjectMapper 也支持在映射时自定义转换规则。如果要使用自定义转换，创建一个 tuple（元祖）包含 ```map["field_name"]``` 和你要使用的变换放在 ```<-``` 的右边：
 

README.md

@@ -296,6 +296,29 @@ func mapping(map: Map) {
 }
 ```
 
+# Support Multi-Keys
+Different JSON use different keys to identify the values that mean same thing. Likes,
+First JSON:
+```json
+{
+    "code" : 200,
+    "message" : "success"
+}
+```
+Second JSON:
+```json
+{
+    "code" : 200,
+    "msg" : "success"
+}
+```
+For the 'success' value, you can access the multi-keys object as follows:
+```swift
+func mapping(map: Map) {
+    identifier <- map["message|msg", nested: false, delimiter: "|"]
+}
+```
+
 # Custom Transforms
 ObjectMapper also supports custom transforms that convert values during the mapping process. To use a transform, simply create a tuple with `map["field_name"]` and the transform of your choice on the right side of the `<-` operator:
 ```swift

Sources/Map.swift

@@ -106,7 +106,16 @@ public final class Map {
 				// break down the components of the key that are separated by delimiter
 				(isKeyPresent, currentValue) = valueFor(ArraySlice(key.components(separatedBy: delimiter)), dictionary: JSON)
 			} else {
-				let object = JSON[key]
+				var object = JSON[key]
+                if object == nil && key.contains(delimiter) {
+                    let components = key.components(separatedBy: delimiter)
+                    for item in components {
+                        object = JSON[item]
+                        if object != nil {
+                            break
+                        }
+                    }
+                }
 				let isNSNull = object is NSNull
 				isKeyPresent = isNSNull ? true : object != nil
 				currentValue = isNSNull ? nil : object