How to include tax in minimum order amount magento - magento

Question

on a french ecommerce, we always display prices including taxes.
I have enabled the minimum order amount.
I've test it, it works but the system is based on subtotal excluding taxes.
I need the system based for the this case on global amount (including taxes)
Is it possible ?
Of course I tried to work with a minimum amount excluding taxes, but I manage two tax rates. So It can't be good.
Thanks for your help.

Answer 1

It's possible:
Copy file app/code/core/Mage/Sales/Model/Quote.php to app/code/local/Mage/Sales/Model/Quote.php
Open copied file and find validateMinimumAmount() function:
public function validateMinimumAmount($multishipping = false) {
$storeId = $this->getStoreId();
$minOrderActive = Mage::getStoreConfigFlag('sales/minimum_order/active', $storeId);
$minOrderMulti = Mage::getStoreConfigFlag('sales/minimum_order/multi_address', $storeId);
$minAmount = Mage::getStoreConfig('sales/minimum_order/amount', $storeId);
if (!$minOrderActive) {
return true;
}
$addresses = $this->getAllAddresses();
if ($multishipping) {
if ($minOrderMulti) {
foreach ($addresses as $address) {
foreach ($address->getQuote()->getItemsCollection() as $item) {
$amount = $item->getBaseRowTotal() - $item->getBaseDiscountAmount();
if ($amount < $minAmount) {
return false;
}
}
}
} else {
$baseTotal = 0;
foreach ($addresses as $address) {
/* #var $address Mage_Sales_Model_Quote_Address */
$baseTotal += $address->getBaseSubtotalWithDiscount();
}
if ($baseTotal < $minAmount) {
return false;
}
}
} else {
foreach ($addresses as $address) {
/* #var $address Mage_Sales_Model_Quote_Address */
if (!$address->validateMinimumAmount()) {
return false;
}
}
}
return true;
}
Replace this function with next:
public function validateMinimumAmount($multishipping = false)
{
$storeId = $this->getStoreId();
$minOrderActive = Mage::getStoreConfigFlag('sales/minimum_order/active', $storeId);
$minOrderMulti = Mage::getStoreConfigFlag('sales/minimum_order/multi_address', $storeId);
$minAmount = Mage::getStoreConfig('sales/minimum_order/amount', $storeId);
if (!$minOrderActive) {
return true;
}
$addresses = $this->getAllAddresses();
if ($multishipping) {
if ($minOrderMulti) {
foreach ($addresses as $address) {
$grandTotal = $address->getQuote()->collectTotals()->getGrandTotal();
if ($grandTotal < $minAmount) {
return false;
}
}
} else {
$grandTotal = 0;
foreach ($addresses as $address) {
/* #var $address Mage_Sales_Model_Quote_Address */
$grandTotal += $address->getQuote()->collectTotals()->getGrandTotal();
}
if ($grandTotal < $minAmount) {
return false;
}
}
} else {
foreach ($addresses as $address) {
/* #var $address Mage_Sales_Model_Quote_Address */
$grandTotal = $address->getQuote()->collectTotals()->getGrandTotal();
if ($grandTotal < $minAmount) {
return false;
}
}
}
return true;
}
Clear Magento Cache (System->Configuration->Cache Management).
In new function we use many collectTotals() calls for be sure what Grand Total already calculated but don't worry about calculations overhead because collectTotals() function contains protect from double totals calculation:
if ($this->getTotalsCollectedFlag()) {
return $this;
}

Answer 2

Rewrite the model Mage_Sales_Model_Quote_Address and override the method validateMinimumAmount:
<?php
class StackExchange_MinimumOrderValue_Model_Quote_Address extends Mage_Sales_Model_Quote_Address
{
/**
* Validate minimum amount
*
* #return bool
*/
public function validateMinimumAmount()
{
$storeId = $this->getQuote()->getStoreId();
if (!Mage::getStoreConfigFlag('sales/minimum_order/active', $storeId)) {
return true;
}
if ($this->getQuote()->getIsVirtual() && $this->getAddressType() == self::TYPE_SHIPPING) {
return true;
} elseif (!$this->getQuote()->getIsVirtual() && $this->getAddressType() != self::TYPE_SHIPPING) {
return true;
}
$amount = Mage::getStoreConfig('sales/minimum_order/amount', $storeId);
// $this->getBaseSubtotalInclTax() is sometimes null, so that we calculate it ourselves
$referenceAmount = $this->getBaseSubtotal() + $this->getBaseTaxAmount() + $this->getBaseHiddenTaxAmount() - $this->getBaseShippingTaxAmount() - abs($this->getBaseDiscountAmount());
if ($referenceAmount < $amount) {
return false;
}
return true;
}
}
The interesting thing is that $this->getBaseSubtotalInclTax() does not work. It is sometimes null - specifically, if you proceed from the cart to the checkout page. Hence, we calculate the subtotal inclusive tax ourselves. I hope my formula is correct, but it seems to work:
$referenceAmount = $this->getBaseSubtotal() + $this->getBaseTaxAmount() + $this->getBaseHiddenTaxAmount() - $this->getBaseShippingTaxAmount() - abs($this->getBaseDiscountAmount());