Overriding controller in Magento 1.9

Your controller rewrite XML part should look like this:

<frontend>
    <routers>
        <contacts>
            <args>
                <modules>
                    <Namespace_Modulename before="Mage_Contacts">Namespace_Modulename</Namespace_Modulename>
                </modules>
            </args>
        </contacts>
    </routers>
</frontend>

<args>

<Namespace_Modulename before="Mage_Contacts">Namespace_Modulename</Namespace_Modulename>

</modules>

</args>

</contacts>

</routers>

</frontend>

As you can see instead of using <contactsmodule> node we are here using <contacts> node. <contacts> is the router node which is used by Mage_Contacts module.

After this change is done, do not forget to flush the cache again.

It is a good practice to keep dependency in your module as shown below.

File : Namespace_Modulename.xml

<?xml version="1.0"?>
<config>
    <modules>
        <Namespace_Modulename>
            <active>true</active>
            <codePool>local</codePool>
            <depends>
                <Mage_Contacts />
            </depends>
        </Namespace_Modulename>
    </modules>
</config>

<?xml version="1.0"?>

<Namespace_Modulename>

<codePool>local</codePool>

<Mage_Contacts />

</depends>

</Namespace_Modulename>

</modules>

</config>

This clearly indicates that your module has a dependency on Mage_Contacts module and thus Magento will load your module only after Mage_Contacts is loaded.

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