PhamePostBlogTransaction.php
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	<?php

	final class PhamePostBlogTransaction
	extends PhamePostTransactionType {

	const TRANSACTIONTYPE = 'phame.post.blog';

	public function generateOldValue($object) {
	return $object->getBlogPHID();
	}

	public function applyInternalEffects($object, $value) {
	$object->setBlogPHID($value);
	}

	public function getTitle() {
	return pht(
	'%s changed the blog for this post.',
	$this->renderAuthor());
	}

	public function getTitleForFeed() {
	return pht(
	'%s changed the blog for post %s.',
	$this->renderAuthor(),
	$this->renderObject());
	}

	public function validateTransactions($object, array $xactions) {
	$errors = array();

	if ($this->isEmptyTextTransaction($object->getBlogPHID(), $xactions)) {
	$errors[] = $this->newRequiredError(
	pht('Posts must be attached to a blog.'));
	}

	foreach ($xactions as $xaction) {
	$new_phid = $xaction->getNewValue();

	$blog = id(new PhameBlogQuery())
	->setViewer($this->getActor())
	->withPHIDs(array($new_phid))
	->requireCapabilities(
	array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT,
	))
	->execute();

	if ($blog) {
	continue;
	}

	$errors[] = $this->newInvalidError(
	pht('The specified blog PHID ("%s") is not valid. You can only '.
	'create a post on (or move a post into) a blog which you '.
	'have permission to see and edit.',
	$new_phid));
	}

	return $errors;
	}

	}