Module Hook Problem

[swpierce]

I'm teaching myself Prestashop. I've written a module that works great except for one problem I cannot figure out.

 

The hook function never sets any data in the hook variable.

 

Here's the code:

 

class hkBlockDisplayCategories extends Module {
    public function __construct() {
        $this->name = 'hkBlockDisplayCategories';
        $this->tab = 'front_office_features';
        $this->version = 0.1;
        $this->author = 'Me';
        $this->need_instance = 0;
        
        parent::__construct();
        
        $this->displayName = $this->l('Category Dsp Module');
        $this->description = $this->l('Displays a list of categories available');
    }
    
    public function install() {
        if (!parent::install()) {
            return false;
        }
        if (!$this->registerHook('home')) {
            return false;
        }
        return true;
    }
    
    public function hookHome($params) {
        global $smarty, $cookie, $link;
        
        $id_customer = (int)$params['cookie']->id_customer;
        $id_group = $id_customer ? Customer::getDefaultGroupId($id_customer) : _PS_DEFAULT_CUSTOMER_GROUP_;
        $id_lang = (int)$params['cookie']->id_lang;
        $result = DB::getInstance(_PS_USE_SQL_SLAVE_)->ExecuteS('
            SELECT c.*, cl.* 
            FROM `'._DB_PREFIX_.'category` c
            LEFT JOIN '._DB_PREFIX_.'category_lang cl ON (c.`id_category` = cl.`id_category` AND `id_lang` = '.$id_lang.')
            LEFT JOIN `'._DB_PREFIX_.'category_group` cg ON (cg.`id_category` = c.`id_category`)
            WHERE level_depth > 1 AND level_depth < 3
            AND c.`active` = 1
            AND cg.`id_group` = '.$id_group.'
            ORDER BY `level_depth` ASC, c.`position` ASC');
        $category = new Category(1);
        global $link;
        
        $this->context->smarty->assign(array('categories' => $result, Category::getRootCategories(intval($params['cookie']->id_lang), true), 'link' => $link));
        $this->context->smarty->assign(array('category' => $category,'lang' => Language::getIsoById(intval($params['cookie']->id_lang)),));
        
        //return $this->display(__FILE__, 'hkBlockDisplayCategories.tpl');
        return "Hello, world!";
    }
}

I initially thought the template file might be the problem so I changed it to just return some text. Regardless of what I put in the return, $HOOK_HOME always gets set to the value 1.

 

I added Logger statements (taken out for this post) so I know that everything works down to setting the data in the $HOOK_HOME variable.

 

Please help?

 

Thanks!

 

 

[Rolige]

Maybe you will never see anything with: return "Hello, world!";
You need comment or delete: return "Hello, world!";
And uncomment: return $this->display(__FILE__, 'hkBlockDisplayCategories.tpl');

For test purposes, create the file "hkBlockDisplayCategories.tpl" in root of the module, and add some test lines inside.

 

 

regards

[vekia]

to check if hook works, you can use there 

print_r("hello world");

 

then if hook (module hook) is executed properly you will see hello world text at the header section of your website.

[swpierce]

Thanks Vekia!

 

print_r("hello world");   <= worked great

 

Turns out I was missing a $

 

{HOOK_HOME} doesn't work as well as {$HOOK_HOME}

 

Thanks again!