docs: add docs

Author: kenjis

user_guide_src/source/changelogs/v4.4.0.rst

@@ -58,8 +58,11 @@ Helpers and Functions
 
 Others
 ======
-- **View:** Added optional 2nd parameter ``$saveData`` on ``renderSection()`` to prevent from auto cleans the data after displaying. See :ref:`View Layouts <creating-a-layout>` for details.
 
+- **View:** Added optional 2nd parameter ``$saveData`` on ``renderSection()`` to prevent from auto cleans the data after displaying. See :ref:`View Layouts <creating-a-layout>` for details.
+- **Auto Routing (Improved)**: Now you can use URI without a method name like
+  ``product/15`` where ``15`` is an arbitrary number.
+  See :ref:`controller-default-method-fallback` for details.
 
 Message Changes
 ***************

user_guide_src/source/incoming/controllers.rst

@@ -263,6 +263,29 @@ Your method will be passed URI segments 3 and 4 (``'sandals'`` and ``'123'``):
 
 .. literalinclude:: controllers/022.php
 
+.. _controller-default-method-fallback:
+
+Default Method Fallback
+=======================
+
+.. versionadded:: 4.4.0
+
+If the controller method corresponding to the URI segment of the method name
+does not exist, and if the default method is defined, the URI segments are
+passed to the default method for execution.
+
+.. literalinclude:: controllers/024.php
+
+Load the following URL::
+
+    example.com/index.php/product/15/edit
+
+The method will be passed URI segments 2 and 3 (``'15'`` and ``'edit'``):
+
+.. note:: If there are more parameters in the URI than the method parameters,
+    Auto Routing (Improved) does not execute the method, and it results in 404
+    Not Found.
+
 Defining a Default Controller
 =============================
 

user_guide_src/source/incoming/controllers/024.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Controllers;
+
+class Product extends BaseController
+{
+    public function getIndex($id = null, $action = '')
+    {
+        // ...
+    }
+}