public static function shift_field(Resource_Model $resource, $direction = 'up')
	{
		// Make sure we have a valid resource (and only one!)
		if(count($resource) === 1)
		{
			// What direction are we moving it?
			list($direction, $sort) = (strtolower($direction) === 'up') ? array('<','DESC') : array('>','ASC');
			
			// Get resource information
			$resource->current();
			
			// Get the field we are going to swap with
			$field_for_swap = Resource_Model::factory()
									->where('sort_order '.$direction.$field->sort_order)
									->where('resource_id', $field->resource_id)
									->orderby('sort_order', $sort)
									->limit(1)
									->get()
									->current();
			
			// If we found a field to swap with, then let's update them
			if (count($field_for_swap === 1))
			{
				// Swap the values
				list($resource->sort_order, $field_for_swap->sort_order) = array($field_for_swap->sort_order, $resource->sort_order);
				
				// Save the changes!
				$resource->save();
				$field_for_swap->save();
			}
		}
	}