Joomla throwing error for custom validation rule - php

Question

I'm a beginner to the Joomla and trying to develop a component, but when I try to add rules to my backend panel, I keep getting this error. If anybody can tell me what I'm doing wrong, will be appreciated.
Here's the code for the rule which I've written.
com_mycomponent/models/rules/segment_name.php
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
/**
* Form Rule class for the Joomla Framework.
*/
class JFormRuleSegmentName extends JFormRule
{
/**
* The regular expression.
*
* #access protected
* #var string
* #since 2.5
*/
protected $regex = '^[^0-9]+$';
}
And this is my form code:
com_mycomponent/models/forms/segment.xml
<?xml version="1.0" encoding="utf-8"?>
<form addrulepath="/administrator/components/com_mycomponent/models/rules">
<fieldset>
<field
name="id"
type="hidden"
/>
<field
name="segment_name"
type="text"
label="COM_MYCOMPONENT_SEGMENT_NAME_LABEL"
description="COM_MYCOMPONENT_SEGMENT_NAME_DESC"
size="40"
class="inputbox"
validate="segment_name"
required="true"
default=""
/>
</fieldset>
</form>
It is not working for me, this is what I get when I try to add or edit a new segment:
Error:
An error has occurred.
0 JForm::validateField() rule segment_name missing.

Answer 1

There are some rules that are not followed
You have used segment_name as file name but you have given SegmentName as class name. Both should match.
Not mandatory but you can use in the rules file
jimport('joomla.form.formrule');
defined('_JEXEC') or die('Restricted access');
// import Joomla formrule library
jimport('joomla.form.formrule');
/**
Form Rule class for the Joomla Framework.
*/
class JFormRuleSegment_rule extends JFormRule
{
In your form the addrule path should be given like this
<form>
<fieldset name="form_name" addrulepath="components/com_mycomponent/models/rules">
----------------fields
</fieldset>
</form>
form_name should be your form name
The suffix of the classname (JFormRule[SUFFIX]) must be the same as the rule file name. https://docs.joomla.org/Server-side_form_validation