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PhabricatorProjectColumnRemoveTriggerController.php
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			<?php

			final class PhabricatorProjectColumnRemoveTriggerController
			extends PhabricatorProjectBoardController {

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

			$column = id(new PhabricatorProjectColumnQuery())
			->setViewer($viewer)
			->withIDs(array($id))
			->requireCapabilities(
			array(
			PhabricatorPolicyCapability::CAN_VIEW,
			PhabricatorPolicyCapability::CAN_EDIT,
			))
			->executeOne();
			if (!$column) {
			return new Aphront404Response();
			}

			$done_uri = $column->getWorkboardURI();

			if (!$column->getTriggerPHID()) {
			return $this->newDialog()
			->setTitle(pht('No Trigger'))
			->appendParagraph(
			pht('This column does not have a trigger.'))
			->addCancelButton($done_uri);
			}

			if ($request->isFormPost()) {
			$column_xactions = array();

			$column_xactions[] = $column->getApplicationTransactionTemplate()
			->setTransactionType(
			PhabricatorProjectColumnTriggerTransaction::TRANSACTIONTYPE)
			->setNewValue(null);

			$column_editor = $column->getApplicationTransactionEditor()
			->setActor($viewer)
			->setContentSourceFromRequest($request)
			->setContinueOnNoEffect(true)
			->setContinueOnMissingFields(true);

			$column_editor->applyTransactions($column, $column_xactions);

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

			$body = pht('Really remove the trigger from this column?');

			return $this->newDialog()
			->setTitle(pht('Remove Trigger'))
			->appendParagraph($body)
			->addSubmitButton(pht('Remove Trigger'))
			->addCancelButton($done_uri);
			}
			}