diff --git a/Source/SwiftRestModel.swift b/Source/SwiftRestModel.swift
index 62c5afe..9123bdf 100644
--- a/Source/SwiftRestModel.swift
+++ b/Source/SwiftRestModel.swift
@@ -41,7 +41,7 @@ public class SwiftRestModel: NSObject
     - returns: Bool
     */
     public func isNew() -> Bool {
-        if (self.data["id"].isExists()) {
+        if (self.data["id"].exists()) {
             return false
         }
         
@@ -145,4 +145,4 @@ public class SwiftRestModel: NSObject
                 }
         }
     }
-}
\ No newline at end of file
+}