ModelAdminFilteredViewExtension.php

<?php


class ModelAdminFilteredViewExtension extends DataExtension
{

	public function updateList(SS_List &$list)
	{
		$list = $list->filter($this->getFilters());
	}

	
	public function updateEditForm(Form &$form)
	{				
		$filters = $this->getFilters();
		$grid = null;

		foreach($form->Fields() as $f) {
			if($f instanceof GridField) {
				$grid = $f;
				break;
			}
		}

		if(!$grid) return $form;

		$grid->getConfig()->getComponentByType('GridFieldDetailForm')
			->setItemEditFormCallback(function ($detailForm) use ($filters) {
				foreach($filters as $name => $val) {				
					$detailForm->Fields()->push(
						HiddenField::create($name, null, $val)
					);					
				}
			});
	}

	
	protected function getFilters()
	{
		if($this->owner->hasMethod('getModelAdminFilters')) {
			return $this->owner->getModelAdminFilters();
		}

		return $this->owner->config()->filters;
	}
}