user role parsing fix.

lib/models/user.dart

@@ -157,8 +157,11 @@ class User {
     password = json['password'];
     token = json['token'];
     roles = json['roles'];
-    if (userRoles != null) {
+    if (json['userRoles'] != null) {
-      json['userRoles'] = userRoles.map((v) => v.toJson()).toList();
+      userRoles = [];
+      json['userRoles'].forEach((v) {
+        userRoles.add(UserRoles.fromJson(v));
+      });
     }
     tokenlife = json['tokenlife'];
     isAuthenticated = json['isAuthenticated'];