Ubercart alter product price when product added to cart

Question

I need to alter Ubercart product price on Ubercart 3, Drupal 7, when product is added to cart. I need to check some conditions, and if met, change the price. I thought i can go with

function MYMODULE_uc_cart_item($op, &$item) {  
  switch ($op) {
    case 'load':
      drupal_set_message(t('It works!'), 'status');
      break;
  }
}

but not sure am i targeting right hook.

It seems that it does not work (it is not invoked).

Thanks for clues

Answer 1

Here is another hook you can play with hook_uc_add_to_cart

Parameters:
$nid - the node ID of the product
$qty - the quantity being added
$data - the data array, including attributes and model number adjustments

Here is how to work with hooks

Drupal's module system is based on the concept of "hooks". A hook is a PHP function that is named foo_bar(), where "foo" is the name of the module (whose filename is thus foo.module) and "bar" is the name of the hook. Each hook has a defined set of parameters and a specified result type.

function hook_uc_cart_item($op, &$item) { the work hook should be replaced with your modules name like

function YOURMODULENAME_uc_cart_item($op, &$item)

See Hooks

Answer 2

The problem was in clearing cache. For some reason, clearing cache from Drush does not completely work. (I need to clear it from interface). It might be also APC i implemented at some point. I have issues when clearing cache for modules/other code.

EDIT:

I can't get hook_uc_cart_item to work so far. (even as hook_cart_item) hook_add_to_cart works, and hook_uc_cart_alter also works (for me)

I think i might take hook_cart_alter approach, as it gets items every time cart is viewed, in fact, they say it gets loaded all the time, and they have warned of performance issue, but as i need to watch on cart all the time as i have some dynamic calculations depending what is in cart, i think, if devel and kcachegrind dont complain, i will not, too :)

I see uc_coupon module also uses hook_cart_alter without fear :)

Answer 3

This is how I solved it:

function mymodule_uc_cart_alter(&$items) 
{
    $items[45]->price = 29393;
}

In this example I'm just hardcoding the change to demonstrate how to change the value. Obviously you would apply your own logic here based on whatever your requirements are.