testing

20130728.ponderunique.php
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			<?php

			$map = array();

			echo pht('Merging duplicate answers by authors...')."\n";

			$atable = new PonderAnswer();
			$conn_w = $atable->establishConnection('w');
			$conn_w->openTransaction();

			$answers = new LiskMigrationIterator(new PonderAnswer());
			foreach ($answers as $answer) {
			$aid = $answer->getID();
			$qid = $answer->getQuestionID();
			$author_phid = $answer->getAuthorPHID();

			echo pht('Processing answer ID #%d...', $aid)."\n";

			if (empty($map[$qid][$author_phid])) {
			echo pht('Answer is unique.')."\n";
			$map[$qid][$author_phid] = $answer;
			continue;
			} else {
			echo pht('Merging answer.')."\n";
			$target = $map[$qid][$author_phid];
			queryfx(
			$conn_w,
			'UPDATE %T SET content = %s WHERE id = %d',
			$target->getTableName(),

			$target->getContent().
			"\n\n".
			"---".
			"\n\n".
			"> (This content was automatically merged from another answer by the ".
			"same author.)".
			"\n\n".
			$answer->getContent(),

			$target->getID());

			queryfx(
			$conn_w,
			'DELETE FROM %T WHERE id = %d',
			$target->getTableName(),
			$answer->getID());

			queryfx(
			$conn_w,
			'UPDATE %T SET targetPHID = %s WHERE targetPHID = %s',
			'ponder_comment',
			$target->getPHID(),
			$answer->getPHID());
			}
			}

			$conn_w->saveTransaction();
			echo pht('Done.')."\n";