Converting A Quote Attribute To An Order

$attributes = Mage::getSingleton('catalog/config')->getProductAttributes();
$collection->addAttributeToSelect($attributes);

Handy to add attributes to sales_flat_order:

$installer->getConnection()->addColumn(
    $this->getTable('sales/order'),
    'some_attribute',
    [
        'type' => Varien_Db_Ddl_Table::TYPE_INTEGER,
        'length' => ...

Magento has a Datetime backend model but formats a Zend_Date object without the time. So if you want to store datetime (actually with time) you will need to setup your own backend model.

Here is how i've done it:

class Namespace_Module_Mod...

Only a core set of attributes are added to the product collection (for the list page) by default. This bit of XML will allow you to add additional attributes to that collection:

<config>
    <frontend>
        <product>
          ...

In order to serve a different package, or any element of a theme (translations, templates, skin or layout) you can use design exceptions, which allow you to specify different values for each of the design-related settings by using user-agent strin...

$entityTypeId = Mage::getModel('catalog/product')
                  ->getResource()
                  ->getEntityType()
                  ->getId();

$attributeSet = Mage::getModel('eav/entity_attribute_set')
              ...

Declare an admin layout XML file for your module in your config.xml:

<config>
    <adminhtml>
        <layout>
            <updates>
                <your_module>
                    <file>your-module.xml</file>
    ...

To add a class via layout XML:

<reference name="root">
    <action method="addBodyClass"><classname>whatever</classname></action>
</reference>

Or to add via code, from a controller or block

if ($root = $this->getLayout()->getBlo...

Adding A Tab To The Product Screen

1. Declare an admin layout XML file for your module in your config.xml:

   ...

Don't do it!! I did the below:

public function getDefaultEntities()
{
    return array(
        'catalog_product' => array(
            'attributes' => array(
                'size_guide_id' => array(
                 ...