I'm trying to create a minimum total checkout module that will prevent someone from checking out with a total less than a configurable amount.
I'm using the event sales_quote_save_before
to display an error on the checkout/cart page when it's opened.
<?xml version="1.0"?>
<config>
<frontend>
<events>
<sales_quote_save_before>
<observers>
<b2b>
<class>b2b/observer</class>
<method>checkTotalsCart</method>
</b2b>
</observers>
</sales_quote_save_before>
</events>
</frontend>
</config>
And in the observer
public function checkTotalsCart()
{
if ($this->_hasCartError()) { /* does some checks, returns bool */
$this->_setErrorMessage();
}
}
protected function _setErrorMessage()
{
$session = Mage::getSingleton("b2b/session"); /* extends Mage_Core_Model_Session */
$session->addError($this->helper->getErrorMessage());
}
The problem is that when you update the cart from the cart page, the error message is showing up twice. I guess that event is happening multiple times.
I've tried to check if the message was previously set with a custom session variable
protected function _setErrorMessage()
{
$session = Mage::getSingleton("b2b/session");
if ($session->hasErrorMessage()) {
return;
}
$session->addError($this->helper->getErrorMessage());
$session->hasErrorMessage(true);
}
But that didn't work either. How can I make sure an error message is only showing up once per page request?