PonderAnswerHistoryController.php
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	<?php

	final class PonderAnswerHistoryController extends PonderController {

	public function shouldAllowPublic() {
	return true;
	}

	public function handleRequest(AphrontRequest $request) {
	$viewer = $request->getViewer();
	$id = $request->getURIData('id');

	$answer = id(new PonderAnswerQuery())
	->setViewer($viewer)
	->withIDs(array($id))
	->executeOne();
	if (!$answer) {
	return new Aphront404Response();
	}

	$timeline = $this->buildTransactionTimeline(
	$answer,
	new PonderAnswerTransactionQuery());
	$timeline->setShouldTerminate(true);

	$qid = $answer->getQuestion()->getID();
	$aid = $answer->getID();

	$crumbs = $this->buildApplicationCrumbs();
	$crumbs->setBorder(true);
	$crumbs->addTextCrumb("Q{$qid}", "/Q{$qid}");
	$crumbs->addTextCrumb("A{$aid}", "/Q{$qid}#{$aid}");
	$crumbs->addTextCrumb(pht('History'));
	$crumbs->setBorder(true);

	$header = id(new PHUIHeaderView())
	->setHeader(pht('Answer History'))
	->setHeaderIcon('fa-history');

	$view = id(new PHUITwoColumnView())
	->setHeader($header)
	->setFooter($timeline);

	return $this->newPage()
	->setTitle(pht('Answer History'))
	->setCrumbs($crumbs)
	->appendChild($view);
	}

	}