SIlverstripe 3.5 filters page

FiltersPage.php

<?php

class FiltersPage extends Page {

	private static $has_many = array (
		
		'Types' 		=> 'Type',
		'Services' 		=> 'Service',
		'Industries'	=> 'Industry',
		'Approaches'    => 'Approach',
		'Projects'      => 'Project'
	);

	static $defaults = array (

    	'ShowInMenus' 		=> false,
	 	'ShowInSearch' 		=> false
    );

	public function getCMSFields() {
		
		$fields = parent::getCMSFields();
		
		$fields->addFieldToTab('Root.Filters', GridField::create(
			'Types',
			'Types on this page',
			$this->Types(),
			GridFieldConfig_RecordEditor::create()
		));

		$fields->addFieldToTab('Root.Filters', GridField::create(
			'Services',
			'Services on this page',
			$this->Services(),
			GridFieldConfig_RecordEditor::create()
		));

		$fields->addFieldToTab('Root.Filters', GridField::create(
			'Industries',
			'Industries on this page',
			$this->Industries(),
			GridFieldConfig_RecordEditor::create()
		));

		$fields->addFieldToTab('Root.Filters', GridField::create(
			'Approaches',
			'Approaches on this page',
			$this->Approaches(),
			GridFieldConfig_RecordEditor::create()
		));

		$fields->addFieldToTab('Root.Filters', GridField::create(
			'Projects',
			'Projects on this page',
			$this->Projects(),
			GridFieldConfig_RecordEditor::create()
		));

		return $fields;
	}
}

class FiltersPage_Controller extends Page_Controller {

	private static $allowed_actions = array (
		'showtypes',
		'showindustry',
		'showapproach',
		'showservice'
		
	);

    public function ListTypes($tcount = 6) {
        return Type::get()
            ->sort('Created', 'ASC')
            ->limit($tcount);
    }

	public function ListIndustries($icount = 6) {
        return Industry::get()
            ->sort('Created', 'ASC')
            ->limit($icount);
    }

	public function ListApproaches($acount = 6) {
        return Approach::get()
            ->sort('Created', 'ASC')
            ->limit($acount);
    }

	public function ListServices($scount = 20) {
        return Service::get()
            ->sort('Created', 'ASC')
            ->limit($scount);
    }
	public function ListProjects($pcount = 20) {
        return Project::get()
            ->sort('Created', 'ASC')
            ->limit($pcount);
    }

	public function showservice(SS_HTTPRequest $request) {
		$service = Service::get()->byID($request->param('ID'));

		if(!$service) {
			return $this->httpError(404, 'That service could not be found');
		}

		return array (
			'Service' => $service,
			'Title' => $service->Title
		);
	}

	public function showapproach(SS_HTTPRequest $request) {
		$approach = Approach::get()->byID($request->param('ID'));

		if(!$approach) {
			return $this->httpError(404, 'That approach could not be found');
		}

		return array (
			'Approach' => $approach,
			'Title' => $approach->Title
		);
	}

	public function showindustry(SS_HTTPRequest $request) {
		$industry = Industry::get()->byID($request->param('ID'));

		if(!$industry) {
			return $this->httpError(404, 'That industry could not be found');
		}

		return array (
			'Industry' => $industry,
			'Title' => $industry->Title
		);
	}

	public function showtypes(SS_HTTPRequest $request) {
		$type = Type::get()->byID($request->param('ID'));

		if(!$type) {
			return $this->httpError(404, 'That type could not be found');
		}

		return array (
			'Type' => $type,
			'Title' => $type->Title
		);
	}
}