Trying to add a custom field to the Magento page CMS

Question

I am attempting to add a custom field to the Magento CMS page editor using this guide, but I am not able to get the additional field to display in the backend.

Here are the files I have created:

ddog_customcms.xml in /app/etc/modules

<config>
    <modules>
        <ddog_customcms>
            <active>true</active>
            <codePool>local</codePool>
            <depends/>
        </ddog_customcms>
    </modules>
</config>

config.xml in /app/code/local/ddog/customcms/etc

<?xml version="1.0"?>
<config>
    <modules>
        <ddog_customcms>
            <version>1.0.0</version>
        </ddog_customcms>
    </modules>
    <global>
        <models>
            <ddog_customcms>
                <class>ddog_customcms_Model</class>
            </ddog_customcms>
        </models>
        <events>
            <adminhtml_cms_page_edit_tab_content_prepare_form>
                <observers>
                    <ddog_customcms_page_edit_tab_content>
                        <type>singleton</type>
                        <class>ddog_customcms_Model_Observer</class>
                        <method>cmsField</method>
                    </ddog_customcms_page_edit_tab_content>
                </observers>
            </adminhtml_cms_page_edit_tab_content_prepare_form>
        </events>
        <resources>
            <ddog_customcms_setup>
                <setup>
                    <module>ddog_customcms</module>
                </setup>
            </ddog_customcms_setup>
        </resources>
    </global>
</config>

content_custom column added to cms_page database table

observer.php in /app/code/local/ddog/customcms/Model/

<?php

class ddog_customcms_observer
{
    public function addNewCmsField($observer)
    {
        //get CMS model with data
        $model = Mage::registry('cms_page');
        //get form instance
        $form = $observer->getForm();
        //create new custom fieldset 'ddog_customcms_content_fieldset'
        $fieldset = $form->addFieldset('ddog_customcms_content_fieldset', array('legend'=>Mage::helper('cms')->__('Custom'),'class'=>'fieldset-wide'));
        //add new field
        $fieldset->addField('content_custom', 'text', array(
            'name'      => 'content_custom',
            'label'     => Mage::helper('cms')->__('Content Custom'),
            'title'     => Mage::helper('cms')->__('Content Custom'),
            'disabled'  => false,
            //set field value
            'value'     => $model->getContentCustom()
        ));

    }
}

I have cleared the cache but I can't get the field to appear anywhere in the page editor. Can anybody help?

Answer 1

here in declaration

<events>
     <adminhtml_cms_page_edit_tab_content_prepare_form>
         <observers>
             <ddog_customcms_page_edit_tab_content>
                 <type>singleton</type>
                 <class>ddog_customcms_Model_Observer</class>
                 <method>cmsField</method>
             </ddog_customcms_page_edit_tab_content>
         </observers>
     </adminhtml_cms_page_edit_tab_content_prepare_form>
</events>

you set method name cmsField but in observer you write method name addNewCmsField change it to cmsField and it will work