Problem Creating and Using Session Variable in Different Module

event-observeronepage-checkoutsession

I set a session variable through ajax request like in checkout page

Mage::getSingleton('customer/session')->setMyValue($value_from_post_data);

The above is set in a controller of a One Page Checkout module.

I have an event observer which observes checkout_onepage_controller_success_action here, when I access the session, I don't find my_value the session variable I created.

Note: The session ids are same. No change in them. After the session value is set, I printed the whole session data to confirm, the setMyValue created my_value in the session.

So the ajax request has done its job. It has set the variable But the observer picks up old session data. Why is this happening, give me a work around

Best Answer

As you have said that your form is exit in Checkout step then we can set field value at Quote Object and then you can get this quote variable value from order at success page which fill you requirement.

Step1: Create new field at Sale Quote table and Order table using installer 

$installer->startSetup();

$installer->addAttribute("quote", "customfield", array("type"=>"text"));
$installer->addAttribute("order", "customfield", array("type"=>"text"));
$installer->endSetup();

Step2: On your Custom controller save this field to new quote field

    if(Mage::getSingleton('checkout/session')->getQuote()->getId()){
Mage::getSingleton('checkout/session')->getQuote()->setCustomfield($yourFieldValue)->save();
    }

Step3: We have used copy field logic for copy Quote field value to Order field value.

<global>
        <fieldsets>
            <sales_convert_quote>                          
                <customfield><to_order>*</to_order></customfield>
            </sales_convert_quote>

            <sales_convert_order>                                             
                <customfield><to_quote>*</to_quote></customfield>
            </sales_convert_order>
        </fieldsets>
    </global>

Please Study:about this

Step4: Then you can easy get this field value from Order object

$OrderObejct->getCustomfield();

Full Module:

Step1: Create Module at app/code/local/Stackexchange/Magento51524/etc/config.xml

code is 

<?xml version="1.0"?>
<config>
  <modules>
    <Stackexchange_Magento51524>
      <version>0.1.0</version>
    </Stackexchange_Magento51524>
  </modules>
  <global>
    <helpers>
      <magento51524>
        <class>Stackexchange_Magento51524_Helper</class>
      </magento51524>
    </helpers>
    <models>
      <magento51524>
        <class>Stackexchange_Magento51524_Model</class>
        <resourceModel>magento51524_mysql4</resourceModel>
      </magento51524>
    </models>
    <resources>
      <salesattribute1420712691_setup>
        <setup>
          <module>Stackexchange_Magento51524</module>
          <class>Mage_Sales_Model_Mysql4_Setup</class>
        </setup>
        <connection>
          <use>core_setup</use>
        </connection>
      </salesattribute1420712691_setup>
      <salesattribute1420712691_write>
        <connection>
          <use>core_write</use>
        </connection>
      </salesattribute1420712691_write>
      <salesattribute1420712691_read>
        <connection>
          <use>core_read</use>
        </connection>
      </salesattribute1420712691_read>
    </resources>
    <events>
      <checkout_submit_all_afte> <!-- identifier of the event we want to catch -->
        <observers>
          <checkout_submit_all_afte_handler> <!-- identifier of the event handler -->
            <type>singleton</type> <!-- class method call type; valid are model, object and singleton -->
            <class>magento51524/observer</class> <!-- observers class alias -->
            <method>ownfieldValueset</method>  <!-- observer's method to be called -->
            <args></args> <!-- additional arguments passed to observer -->
          </checkout_submit_all_afte_handler>
        </observers>
      </checkout_submit_all_afte>
    </events>
  </global>
    <global>
        <fieldsets>
            <sales_convert_quote>                          
                <customfield><to_order>*</to_order></customfield>
            </sales_convert_quote>
            <sales_convert_order>                                             
                <customfield><to_quote>*</to_quote></customfield>
            </sales_convert_order>
        </fieldsets>
    </global>
</config>

Step2: Create Installer file at app/code/local/Stackexchange/Magento51524/sql/salesattribute1420712691_setup/mysql4-install-0.1.0.php

And code is:

<?php
$installer = $this;
$installer->startSetup();

$installer->addAttribute("quote", "customfield", array("type"=>"text"));
$installer->addAttribute("order", "customfield", array("type"=>"text"));
$installer->endSetup();

Step3: Create Helper class at app/code/local/Stackexchange/Magento51524/Helper/Data.php

Code is 

<?php
class Stackexchange_Magento51524_Helper_Data extends Mage_Core_Helper_Abstract
{
}

Step4: Observe file : at app/code/local/Stackexchange/Magento51524/Model/Observer.php

A nd code 

<?php
class Stackexchange_Magento51524_Model_Observer
{

    public function ownfieldValueset(Varien_Event_Observer $observer)
    {
        //Mage::dispatchEvent('admin_session_user_login_success', array('user'=>$user));
        //$user = $observer->getEvent()->getUser();
        //$user->doSomething();
    }

}

Step5: Create Stackexchange_Magento51524.xml which used for Module config at app\etc\modules\

Code is 

<?xml version="1.0"?>
<config>
  <modules>
    <Stackexchange_Magento51524>
      <active>true</active>
      <codePool>local</codePool>
      <version>0.1.0</version>
    </Stackexchange_Magento51524>
  </modules>
</config>

Step:On your submit controller add this code for set the field to new quote fields

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