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# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.configure(2) do |config|
  # OS to install on VM
  config.vm.box = "ubuntu/trusty64"

  # IP to access VM
  config.vm.network "private_network", ip: "192.168.33.10"

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# Update repository
config.vm.provision "shell", inline: "sudo apt-get update"

# Install apache
config.vm.provision "shell", inline: "sudo apt-get install -qq apache2"

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<?xml version="1.0"?>
<config>
    <sections>
        <cataloginventory>
            <groups>
                <options>
                    <fields>
                        <min_total_qty translate="label">
                            <label>Minimum Qty Allowed in Shopping Cart</label>
                            <frontend_model>cataloginventory/adminhtml_form_field_minsaleqty</frontend_model>

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<?xml version="1.0"?>
<config>
    <modules>
        <Jvs_MinTotalQty>
            <version>1.0.0</version>
        </Jvs_MinTotalQty>
    </modules>
    <global>
        <models>
            <jvs_mintotalqty>

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<?php
class Jvs_MinTotalQty_Model_Observer
{
    public function checkTotalQtyBeforeCheckout(Varien_Event_Observer $observer)
    {
        $quote    = $observer->getDataObject();
        $customer = Mage::helper('customer')->getCustomer();

        // If the minimun total quantity is not met
        // redirect to cart page with error message

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<?php
class Jvs_MinTotalQty_Helper_Data extends Mage_CatalogInventory_Helper_Minsaleqty
{
    const XML_PATH_MIN_TOTAL_QTY = 'cataloginventory/options/min_total_qty';

    /**
     * Retrieve min_total_qty value from config
     *
     * @param  int   $customerGroupId
     * @param  mixed $store

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<?xml version="1.0"?>
<config>
    <modules>
        <Jvs_MinTotalQty>
            <active>true</active>
            <codePool>community</codePool>
        </Jvs_MinTotalQty>
        <depends>
            <Mage_CatalogInventory/>
        </depends>

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<admin>
    <routers>
        <custom_module>
            <use>admin</use>
            <args>
                <module>custom_module</module>
                <frontName>custom_module</frontName>
            </args>
        </custom_module>
    </routers>

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<admin>
    <routers>
        <adminhtml>
            <args>
                <modules>
                    <custom_module after="Mage_Adminhtml">CustomModule_Adminhtml</custom_module>
                </modules>
            </args>
        </adminhtml>
    </routers>

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<?php
$expression = '(field1 - field2)';
$condition = $this->_getConditionSql($expression, array('eq' =>3 ));
$this->_select->where($condition);
// or..
$collection->addFieldToFilter('field', array('eq' => 3));