PonderAnswerHistoryController.php
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	<?php

	final class PonderAnswerHistoryController extends PonderController {

	private $id;

	public function willProcessRequest(array $data) {
	$this->id = $data['id'];
	}

	public function processRequest() {
	$request = $this->getRequest();
	$viewer = $request->getUser();

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


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

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

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

	return $this->buildApplicationPage(
	array(
	$crumbs,
	$timeline,
	),
	array(
	'title' => pht('Answer History'),
	));
	}

	}