Module that is called when cart is modified

[danrimer]

Hi 

I'm a bit stuck. Actually, I don't know where to start!

I've made shipping modules in the past and they are fairly simple to iterate through the cart products and work out the weight/price of the order.

However, I now find myself with 8 shipping modules and I feel that the multiple iterations must be "costing" a lot in terms of server performance - particularly when there are a large number of products in the cart!

What I'm trying to do is create a module that is called each time the cart is updated so that the module can do the calculation once and pass this information to my shipping modules (via a table in the database).

 

Can someone show me the barebones of how to do this please?

 

Thanks

 

[endriu107]

Check this: https://devdocs.prestashop-project.org/8/modules/concepts/hooks/list-of-hooks/actioncartsave/

[danrimer]

@endriu107 Of course! Thank you 🙂

Thanks for pointing that out. I haven't had any need to investigate hooks so far, so this is the prompt I needed.

Once I've got a module that does *something*, I'll post it.

Cheers

[danrimer]

I've created a basic module that installs and uninstalls then I've added the hook part like this:

	public function install()
	{
        $file = dirname(__FILE__) . '/logging.log';
        if ($this->registerHook('actionCartSave')) {
            file_put_contents($file, "hook registered\n", FILE_TEXT | LOCK_EX);
        } else {
            file_put_contents($file, "hook NOT registered\n", FILE_APPEND | LOCK_EX);
        }
	   return parent::install(); 
	}

And also a function for the hook to call:

    public function hookActionCartSave()
    {
        $file = dirname(__FILE__) . '/logging.log';
        file_put_contents($file, 'hookActionCartSave triggered'."\n",FILE_APPEND | LOCK_EX );
        if (!isset($this->context->cart)) {
            file_put_contents($file, 'no cart!'."\n",FILE_APPEND | LOCK_EX );
            return;
        }
            file_put_contents($file, 'cart detected'."\n",FILE_APPEND | LOCK_EX );
            $cart = $this->context->cart;
    }

The logging.log file is created with "hook registered" but then it never changes, which makes me think that the hook isn't calling the function. Am I missing something?

 

Thanks

 

[endriu107]

At first you must register hook, do it like this:

 

public function install()
{
	return parent::install()
	&& $this->registerHook('actionCartSave');
}

public function hookActionCartSave()
{
	$file = dirname(__FILE__) . '/logging.log';
	file_put_contents($file, 'hookActionCartSave triggered'."\n",FILE_APPEND | LOCK_EX );
	if (!isset($this->context->cart)) {
		file_put_contents($file, 'no cart!'."\n",FILE_APPEND | LOCK_EX );
		return;
	}
	file_put_contents($file, 'cart detected'."\n",FILE_APPEND | LOCK_EX );
	$cart = $this->context->cart;
}

 

[danrimer]

Thanks for that!

I think it didn't work because I was trying to add the hook before installing the module.

It works perfectly now so I can get on with the rest of my module now.

 

Thank you so much for your help.