diff --git a/Swift/macroses/class.utils.twig b/Swift/macroses/class.utils.twig
index 83c88c0..623a8c2 100644
--- a/Swift/macroses/class.utils.twig
+++ b/Swift/macroses/class.utils.twig
@@ -27,3 +27,7 @@
 
     {{- self.typeParameters(parentTypeParameters, false) -}}
 {% endmacro %}
+
+{% macro codingKey(field) %}
+    case {{ field.name }}{% if field.name != field.jsonName %} = {{ "#{field.jsonName}" }}{% endif %}
+{% endmacro %}