Magento - Force Display Full Breadcrumb Path

UPDATE: This was previous method that I used to force display full breadcrumbs for all product pages. Scroll to the bottom of the article to find new method which you can download from github as well.

Today's another issue with magento: not displaying full breadcrumb i.e. categories not included in path. I'm not overriding this time as very little time was assigned to fix this.

copy core file to local: app\code\local\Mage\Catalog\Block\Breadcrumbs.php

On "protected function _prepareLayout()" add below code just before "$title = array();"

$current_category   = Mage::registry('current_category');
$current_product    = Mage::registry('current_product');
if(!$current_category && $current_product){
	$categories = $current_product->getCategoryCollection()->addAttributeToSelect('name')->setPageSize(1);
	foreach($categories as $category) {
		Mage::unregister('current_category');
		Mage::register('current_category', $category);
	}
}

After this addition of code, you will always get full magento breadcrumb.

Full code looks like this:

/**
 * Preparing layout
 *
 * @return Mage_Catalog_Block_Breadcrumbs
 */
protected function _prepareLayout()
{
	if ($breadcrumbsBlock = $this->getLayout()->getBlock('breadcrumbs')) {
		$breadcrumbsBlock->addCrumb('home', array(
			'label'=>Mage::helper('catalog')->__('Home'),
			'title'=>Mage::helper('catalog')->__('Go to Home Page'),
			'link'=>Mage::getBaseUrl()
		));
		// sometimes magento can't get category associated with a product
		// so the full breadcrumb is not shown
		// this is a hack to fix the issue.
		$current_category   = Mage::registry('current_category');
		$current_product    = Mage::registry('current_product');
		// let's check if magento knows what current category is
		// if it doesn't know, let's feed this info to it's brain :)
		if(!$current_category && $current_product){
			$categories = $current_product->getCategoryCollection()->addAttributeToSelect('name')->setPageSize(1);
			foreach($categories as $category) {
				Mage::unregister('current_category');
				Mage::register('current_category', $category);
			}
		}
		$title = array();
		$path  = Mage::helper('catalog')->getBreadcrumbPath();
		foreach ($path as $name => $breadcrumb) {
			$breadcrumbsBlock->addCrumb($name, $breadcrumb);
			$title[] = $breadcrumb['label'];
		}
		if ($headBlock = $this->getLayout()->getBlock('head')) {
			$headBlock->setTitle(join($this->getTitleSeparator(), array_reverse($title)));
		}
	}
	return parent::_prepareLayout();
}

I have now created new module based on Chris's suggestion here

- https://github.com/dbashyal/Magento_Breadcrumbs

Now you can request any update pull request directly in github :)