fixed autogenerated go collection update migration template

CHANGELOG.md

@@ -1,10 +1,55 @@
-## v0.23.0-rc4 (WIP)
+## v0.23.0-rc4
 
 > [!CAUTION]
 > **This is a prerelease intended for test and experimental purposes only!**
 
 - Added more user friendly view collection truncate error message.
 
+- Added `FieldsList.AddMarshaledJSON(json)` helper method to load a serialized json array of objects or a single json object into an existing collection fields list.
+
+- Added an extra suffix character to the name of autogenerated template migration file for `*test` suffixed collections to prevent acidentally resulting in `_test.go` migration files.
+
+- Fixed the autogenerated Go migration template when updating a collection ([#5631](https://github.com/pocketbase/pocketbase/discussions/5631)).
+
+    ⚠️ If you have already used a previous prerelease and have autogenerated Go migration files, please check the migration files **`{timestamp}_updated_{collection}.go`** and change manually:
+
+    <table width="100%">
+        <tr>
+            <th width="50%">Old (broken)</th>
+            <th width="50%">New</th>
+        </tr>
+        <tr>
+    <td width="50%">
+
+    ```go
+    // add field / update field
+    if err := json.Unmarshal([]byte(`[{
+        ...
+    }]`), &collection.Fields); err != nil {
+        return err
+    }
+    ```
+
+    </td>
+    <td width="50%">
+
+    ```go
+    // add field / update field
+    if err := collection.Fields.AddMarshaledJSON([]byte(`{
+        ...
+    }`)); err != nil {
+        return err
+    }
+    ```
+
+    </td>
+        </tr>
+    </table>
+    To test that your Go migration files works correctly you can try to start PocketBase with a new temp pb_data, e.g.:
+
+    ```go
+    go run . serve --dir="pb_data_temp"
+    ```
 
 ## v0.23.0-rc3