Shipping module setting weight independent of number of items ordered

[Arunachala]

I use 0 or zero weight for magazine subscriptions which are always free shipping. Our volume of sale is usually limited to a max of 3 or 4 copies of the same size. The tube weight is set to say .9 pounds. If a person orders 1 or 3 or 12 identical photogrphs I want the net weight to be 0.9 pounds not .9 times the number purchased. The category ID of one such photo is 5015. There four other items which are shipped this way with different IDs. I am using version 1.3.9f planning to upgrade soon.

[Ajeh]

You could customize the FREE SHIPPING freeshipper and Flat Rate flat shipping modules ...

Let's assume the Tube Products are products_id 193, 194, 195 and 196 ...

Edit the file:
/includes/modules/shipping/flat.php

and add the code in red:

      // disable only when entire cart is free shipping
      if (zen_get_shipping_enabled($this->code)) {
        $this->enabled = ((MODULE_SHIPPING_FLAT_STATUS == 'True') ? true : false);
      }

// bof: show if products_id 193, 194, 195 or 196 are in the cart
      if (!IS_ADMIN_FLAG) {
        global $cart;

        $chk_products_in_cart = 0;
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '192');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '193');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '194');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '195');

        $full_count = $_SESSION['cart']->count_contents();

        if ($chk_products_in_cart > 0 && $full_count == $chk_products_in_cart) {
          $this->enabled = true;
        } else {
          $this->enabled = false;
        }
      }
// eof: show if products_id 193, 194, 195 or 196 are in the cart

      if ( ($this->enabled == true) && ((int)MODULE_SHIPPING_FLAT_ZONE > 0) ) {

Then, customize the file:
/includes/modules/shipping/freeshipper.php

      // enable only when entire cart is free shipping
      if (zen_get_shipping_enabled($this->code)) {
        $this->enabled = ((MODULE_SHIPPING_FREESHIPPER_STATUS == 'True') ? true : false);
      }

// bof: do not show if products_id 193, 194, 195 or 196 are in the cart
      if (!IS_ADMIN_FLAG) {
        global $cart;

        $chk_products_in_cart = 0;
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '192');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '193');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '194');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '195');

        if ($chk_products_in_cart > 0) {
          $this->enabled = false;
        }
      }
// eof: do not show if products_id 12, 22, 27 or 122 are in the cart

      if ( ($this->enabled == true) && ((int)MODULE_SHIPPING_FREESHIPPER_ZONE > 0) ) {

Now set the Flat Rate shipping rate to the cost for the Tube Products ...

If you want to use USPS so that you have the USPS shipping rate for 0.9 to obtain all of the methods, you could customize that for the file:
/includes/modules/shipping/usps.php

    // disable only when entire cart is free shipping
    if (zen_get_shipping_enabled($this->code)) {
      $this->enabled = ((MODULE_SHIPPING_USPS_STATUS == 'True') ? true : false);
    }

// bof: show if products_id 193, 194, 195 or 196 are in the cart
      if (!IS_ADMIN_FLAG) {
        global $cart;

        $chk_products_in_cart = 0;
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '192');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '193');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '194');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '195');

        if ($chk_products_in_cart > 0) {
          $this->enabled = true;
        }
      }
// eof: adjust weight if products_id 193, 194, 195 or 196 are in the cart

    if ($this->enabled) {

Then change the code:

    // usps doesnt accept zero weight send 1 ounce (0.0625) minimum
    $usps_shipping_weight = ($shipping_weight <= 0.0 ? 0.0625 : $shipping_weight);

// bof: show if products_id 193, 194, 195 or 196 are in the cart
      if (!IS_ADMIN_FLAG) {
        global $cart;

        $chk_products_in_cart = 0;
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '192');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '193');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '194');
        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '195');

        if ($chk_products_in_cart > 0) {
          if ($shipping_weight <= 0.0) {
            $usps_shipping_weight = 0.9;
          } else {
            $usps_shipping_weight += 0.9;
          }
        }
      }
// eof: adjust weight if products_id 193, 194, 195 or 196 are in the cart

    $shipping_pounds = floor ($usps_shipping_weight);

[Arunachala]

Vow I am amazed at the bounty. It will take me time to digest all this. Will report to you after testing it. Thanks a million. Donuts on their way.

[Ajeh]

NOTE: I have a goober in the Flat Rate flat.php ... I am not taking into account the mixed cart with Tube Products and non-Tube Products ...

NOTE: if you do not need it, then just ignore the code until I have to to review it again ...

The USPS and FREE SHIPPING! code seems to be working ...

[Ajeh]

I fixed the flat.php to show only when the number of Products is the same as the Tube Products ...

[Arunachala]

Thank you for your response. Is it sufficient to apply the mods to USPS module alone? Does the logic require that I set the weight of the tube items zero or negative?

[Ajeh]

Set the weight on the Tube Products to 0 ...

The code for the FREE SHIPPING! freeshipper and USPS has the customizations for these ...

You just need to set the right products_id values in the code ...

If you need more products_id values you can add them by adding another:

        $chk_products_in_cart += $_SESSION['cart']->in_cart_check('products_id', '195');

below the other ones, where you can change the 195 to the next products_id ...