IndexController: loadLayout() not working inside postAction() (Helper_Data not found)

Question

I always get following error when calling $this->loadLayout() inside postAction() of my IndexController:

Fatal error: Class 'Mage_Package_MyModule_Helper_Data' not found in C:\xampp\apps\magento\htdocs\app\Mage.php on line 547

$this->renderLayout() doesn't give me an error.

IndexController:

class Package_MyModule_IndexController extends Mage_Core_Controller_Front_Action {

    public function indexAction() {
        $this->loadLayout();
        $this->renderLayout();
    }

    public function testAction() {
        $this->loadLayout();
        $this->renderLayout();
    }


    public function postAction() {
        $this->loadLayout();
        $this->renderLayout();
        //Mage_Core_Controller_Front_Action::loadLayout();
    }
}

I also tried to call the method directly out of the class Mage_Core_Controller_Front_Action but it still gives me the same error. indexAction() and testAction() do work as expected.

config.xml:

<config>
    <modules>
        <Package_MyModule>
            <version>0.3</version>
        </Package_MyModule>
    </modules>


    <frontend>

        <layout>
            <updates>
                <package_mymodule>
                    <file>mymodule.xml</file>
                </package_mymodule>
            </updates>
        </layout>

        <routers>
             <mymodule>
                <use>standard</use>
                  <args>
                     <module>Package_MyModule</module>
                     <frontName>mymodule</frontName>
                  </args>
             </mymodule>
        </routers>

    </frontend>


    <global>

        <models>
            <mymodule>
                <class>Package_MyModule_Model</class>
            </mymodule>
        </models>

        <helpers>
            <mymodule>
                <class>Package_MyModule_Helper</class>
            </mymodule>
        </helpers>

    </global>
</config>

app/code/local/Package/MyModule/Helper/Data.php:

class Package_MyModule_Helper_Data extends Mage_Core_Helper_Abstract {

}

/layout/mymodule.xml

<layout version="0.1.0">

    <mymodule_index_index>
        <reference name="content">
            <block type="core/template" name="default_mymodule_view" template="mymodule/view.phtml" />
        </reference>
    </mymodule_index_index>

</layout>

I think I got everything necessary at the right place. I have no idea why it isn't working inside postAction().

Answer 1

I'm quite sure you are using $this->__() inside of mymodule/view.phtml. Therefore you need a Helper_Data in your module.

In the config you have node global/helpers/mymodule, this node has to contain the Prefix of your helper, in this case MP_Berater_Helper (the same for the models.

And the name of the class has to be the same as the path, so either you rename your class to Package_MyModule_Helper_Data or you change the path to MP/Berater/Helper/Data.php

Answer 2

Try to change your config.xml with the following:

<global>
    <models>
        <package_mymodule>
            <class>Package_MyModule_Model</class>
        </package_mymodule>
    </models>

    <helpers>
        <package_mymodule>
            <class>Package_MyModule_Helper</class>
        </package_mymodule>
    </helpers>

</global>

Answer 3

I fixed it though I dont know how. I had to reinstall magento. My installation must have been corrupted although it was pretty new. Same code is working on freshly installed magento.