I'm trying to create a section within an Item where it will list all other items in the same category. I understand the Related Items By Tag function, but can't figure out how to get all items from the current category instead.

Can anyone help?

Thanks!

Hello you will either need to publish a K2 content module inside the item.php file, or you need to search the JED or getk2.org/extend/extensions for a K2 plugin that extends the functionality of the related items.

Thanks.

I've managed to answer the problem by adding the following code to my item.php file:

<?php
// This code will display all items from current item category

$Id = JRequest::getInt('id');

$db = &JFactory::getDBO();
$queryItem = "SELECT catid FROM #__k2_items WHERE id = ".$Id;
$db->setQuery( $queryItem );
$result = $db->loadResult();

$query = "SELECT i.id, i.catid, i.alias, i.title, c.alias AS categoryalias".$fields;

$query .= "\n FROM #__k2_items AS i"
."\n INNER JOIN #__k2_categories c ON c.id = i.catid"
."\n WHERE i.published = 1 AND c.published = 1"
."\n AND (i.catid = $result)";

$db->setQuery( $query );
$items = $db->loadObjectList();

// Display items in Masonry object
if (count($items)) {
$catName = $this->item->category->name;
echo "<div class=\"col-12\">";
echo "<h3>More products from $catName</h3>";
echo "<div id=\"container\">";
foreach ($items as $item) {
$item->link = urldecode(JRoute::_(K2HelperRoute::getItemRoute($item->id.':'.urlencode($item->alias), $item->catid.':'.urlencode($item->categoryalias))));
echo "<div class=\"item col-3 related\">";
echo "<div class=\"item-inner\" >";
echo "<div class=\"item-image-wrapper\">";
echo "<img src=\"media/k2/items/cache/".md5("Image".$item->id)."_XL.jpg\" alt=\"$item->title\" />";
echo "</div>";
echo "<div class=\"item-details\">";
echo "<h2>$item->title</h2>";
echo "<a class=\"item-link\" href=\"$item->link\" title=\"$item->title\"></a>";
echo "</div></div></div>";
}
echo "</div></div>";
}

?>

Nice :)
Remember to override the file so you won't lose any changes when you update K2.