PonderHelpfulSaveController.php
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	<?php

	final class PonderHelpfulSaveController extends PonderController {

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

	$answer = id(new PonderAnswerQuery())
	->setViewer($viewer)
	->withIDs(array($id))
	->needViewerVotes(true)
	->executeOne();

	if (!$answer) {
	return new Aphront404Response();
	}

	$edit_uri = '/Q'.$answer->getQuestionID();

	switch ($action) {
	case 'add':
	$newvote = PonderVote::VOTE_UP;
	break;
	case 'remove':
	$newvote = PonderVote::VOTE_NONE;
	break;
	}

	if ($request->isFormPost()) {

	$editor = id(new PonderVoteEditor())
	->setVotable($answer)
	->setActor($viewer)
	->setVote($newvote)
	->saveVote();

	return id(new AphrontRedirectResponse())->setURI($edit_uri);
	}

	if ($action == 'add') {
	$title = pht('Mark Answer as Helpful?');
	$body = pht('This answer will be marked as helpful.');
	$button = pht('Mark Helpful');
	} else {
	$title = pht('Remove Helpful From Answer?');
	$body = pht('This answer will no longer be marked as helpful.');
	$button = pht('Remove Helpful');
	}

	$dialog = $this->newDialog();
	$dialog->setTitle($title);
	$dialog->appendChild($body);
	$dialog->addCancelButton($edit_uri);
	$dialog->addSubmitButton($button);

	return id(new AphrontDialogResponse())->setDialog($dialog);
	}
	}