diff --git a/src/components/FormModel.vue b/src/components/FormModel.vue
index 663764ee6..c4d9a4149 100644
--- a/src/components/FormModel.vue
+++ b/src/components/FormModel.vue
@@ -69,12 +69,7 @@ const $props = defineProps({
     },
     mapper: {
         type: Function,
-        default: (formData, originalData) => {
-            return getUpdatedValues(
-                Object.keys(getDifferences(formData, originalData)),
-                formData,
-            );
-        },
+        default: null,
     },
     clearStoreOnUnmount: {
         type: Boolean,
@@ -226,7 +221,9 @@ async function save() {
     isLoading.value = true;
     try {
         formData.value = trimData(formData.value);
-        const body = $props.mapper(formData.value, originalData.value);
+        const body = $props.mapper
+            ? $props.mapper(formData.value, originalData.value)
+            : formData.value;
         const method = $props.urlCreate ? 'post' : 'patch';
         const url =
             $props.urlCreate || $props.urlUpdate || $props.url || arrayData.store.url;
@@ -292,7 +289,12 @@ function trimData(data) {
     }
     return data;
 }
-
+function onBeforeSave(formData, originalData) {
+    return getUpdatedValues(
+        Object.keys(getDifferences(formData, originalData)),
+        formData,
+    );
+}
 async function onKeyup(evt) {
     if (evt.key === 'Enter' && !('prevent-submit' in attrs)) {
         const input = evt.target;
@@ -329,7 +331,7 @@ defineExpose({
             class="q-pa-md"
             :style="maxWidth ? 'max-width: ' + maxWidth : ''"
             id="formModel"
-            :mapper="mapper"
+            :mapper="onBeforeSave"
         >
             <QCard>
                 <slot