Magento : Overriding Config Controller? - magento

Question

Can any one please tell me how to override config controller in magento. I have attatched my config code below :
<config>
<modules>
<Adodis_Themechooser>
<version>0.1.0</version>
</Adodis_Themechooser>
</modules>
<adminhtml>
<acl>
<resources>
<all>
<title>Allow Everything</title>
</all>
<admin>
<children>
<Adodis_Themechooser>
<title>Themechooser Module</title>
<sort_order>10</sort_order>
</Adodis_Themechooser>
<system>
<children>
<config>
<children>
<themechooser>
<title>Themechooser</title>
</themechooser>
</children>
</config>
</children>
</system>
</children>
</admin>
</resources>
</acl>
</adminhtml>
<global>
<adminhtml>
<rewrite>
<themechooser_config>
<from><![CDATA[#^/admin/system_config/#]]></from>
<to>/themechooser/config/</to>
</themechooser_config>
</rewrite>
</adminhtml>
<models>
<themechooser>
<class>Adodis_Themechooser_Model</class>
</themechooser>
</models>
<helpers>
<themechooser>
<class>Adodis_Themechooser_Helper</class>
</themechooser>
</helpers>
</global>
</config>

Answer 1

An override of the config controller means you will be dealing with all presses of the Save Config button, not just your own themechooser page. That method of override means that no other module could ever make a compatible override of their own, and the "from/to" syntax is outdated anyway. Also an override is not needed at all, you're only interested in the saving of one field and that can be found through a backend_model.
Your module probably has an etc/system.xml file,
<config>
<sections>
<themechooser>
<groups>
<themechooser>
<fields>
<example translate="label">
<label>This is a text field</label>
<frontend_type>text</frontend_type>
<backend_model>themechooser/config_example</backend_model>
<show_in_default>1</show_in_default>
</example>
</fields>
</themechooser>
</groups>
</themechooser>
</sections>
</config>
Note the backend_model. Now make the class that fits themechooser/config_example,
class Adodis_Themechooser_Model_Config_Example extends Mage_Core_Model_Config_Data {
protected function _afterSave() {
$value = $this->getValue();
// $value is the text in the text field
}
}
All that remains is to use $value to set the frontend theme. The field can be any type, it does not have to be text.