Flat Rate Based on Product Type

Finally, after some time working with Drupal, I can make a small contribution. I had the same problem described in this issue. To solve it I edited the file commerce_order.rules.inc, adding a new condition in function commerce_order_rules_condition_info():

  $conditions['commerce_order_contains_product_of_type'] = array(
    'label' => t('Order contains a product of a particular type'),
    'parameter' => array(
      'commerce_order' => array(
        'type' => 'commerce_order',
        'label' => t('Order'),
        'description' => t('The order whose line items should be checked for the specified product type. If the specified order does not exist, the comparison will act as if it is against a quantity of 0.'),
      ),
      'product_id' => array(
        'type' => 'text',
        'label' => t('Product type'),
        'description' => t('The type of the product to look for on the order.'),
      ),
      'operator' => array(
        'type' => 'text',
        'label' => t('Operator'),
        'description' => t('The operator used with the quantity value below to compare the quantity of the specified product on the order.'),
        'default value' => '>=',
        'options list' => 'commerce_numeric_comparison_operator_options_list',
        'restriction' => 'input',
      ),
      'value' => array(
        'type' => 'text',
        'label' => t('Quantity'),
        'default value' => '1',
        'description' => t('The value to compare against the quantity of the specified product type on the order.'),
      ),
    ),
    'group' => t('Commerce Order'),
    'callbacks' => array(
      'execute' => 'commerce_order_rules_contains_product_of_type',
    ),
  );

Also I added the callback function commerce_order_rules_contains_product_of_type($order, $ptype, $operator, $value):

/**
 * Condition callback: checks to see if there are products of a particular type on an order
 * in the specified quantity.
 */
function commerce_order_rules_contains_product_of_type($order, $ptype, $operator, $value) {
  $products = array($ptype => 0);

  // If we actually received a valid order...
  if (!empty($order)) {
    $order_wrapper = entity_metadata_wrapper('commerce_order', $order);

    // Populate the array of the quantities of the products on the order.
    foreach ($order_wrapper->commerce_line_items as $delta => $line_item_wrapper) {
      if (in_array($line_item_wrapper->type->value(), commerce_product_line_item_types())) {
        // Extract a product ID and quantity from the line item.
        $line_item_ptype = $line_item_wrapper->commerce_product->type->value();
        $quantity = $line_item_wrapper->quantity->value();

        // Update the product's quantity value.
        if (empty($products[$line_item_ptype])) {
          $products[$line_item_ptype] = $quantity;
        }
        else {
          $products[$line_item_ptype] += $quantity;
        }
      }
    }
  }

  // Make a quantity comparison based on the operator.
  switch ($operator) {
    case '<':
      return $products[$ptype] < $value;
    case '<=':
      return $products[$ptype] <= $value;
    case '=':
      return $products[$ptype] == $value;
    case '>=':
      return $products[$ptype] >= $value;
    case '>':
      return $products[$ptype] > $value;
  }

  return FALSE;
}

Everything works when creating a new Flat Rate Service with the condition to meet a specific product type. I hope it helps. Regards,

I found there is another module for this as pointed out in http://drupal.org/node/1370770 but I haven't tried it.

@rphillipsfeynman Sounds like you should take a stab on making a patch either for commerce or for the other contrib module.

Perhaps you should do it @lsolesen.