+<?php
+
+namespace Application\Migrations;
+
+use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\DBAL\Schema\Schema;
+use Symfony\Component\DependencyInjection\ContainerAwareInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Changed tags to lowercase
+ */
+class Version20170719231144 extends AbstractMigration implements ContainerAwareInterface
+{
+ /**
+ * @var ContainerInterface
+ */
+ private $container;
+
+ public function setContainer(ContainerInterface $container = null)
+ {
+ $this->container = $container;
+ }
+
+ private function getTable($tableName)
+ {
+ return $this->container->getParameter('database_table_prefix').$tableName;
+ }
+
+ /**
+ * @param Schema $schema
+ */
+ public function up(Schema $schema)
+ {
+ $this->skipIf($this->connection->getDatabasePlatform()->getName() == 'sqlite', 'Migration can only be executed safely on \'mysql\' or \'postgresql\'.');
+
+ // Find tags which need to be merged
+ $dupTags = $this->connection->query("
+ SELECT LOWER(label)
+ FROM ".$this->getTable('tag')."
+ GROUP BY LOWER(label)
+ HAVING COUNT(*) > 1"
+ );
+ $dupTags->execute();
+
+ foreach ($dupTags->fetchAll() as $duplicates) {
+ $label = $duplicates['LOWER(label)'];
+
+ // Retrieve all duplicate tags for a given tag
+ $tags = $this->connection->query("
+ SELECT id
+ FROM ".$this->getTable('tag')."
+ WHERE LOWER(label) = '".$label."'
+ ORDER BY id ASC"
+ );
+ $tags->execute();
+
+ $first = true;
+ $newId = null;
+ $ids = [];
+
+ foreach ($tags->fetchAll() as $tag) {
+ // Ignore the first tag as we use it as the new reference tag
+ if ($first) {
+ $first = false;
+ $newId = $tag['id'];
+ } else {
+ $ids[] = $tag['id'];
+ }
+ }
+
+ // Just in case...
+ if (count($ids) > 0) {
+ // Merge tags
+ $this->addSql("
+ UPDATE ".$this->getTable('entry_tag')."
+ SET tag_id = ".$newId."
+ WHERE tag_id IN (".implode(',', $ids).")"
+ );
+
+ // Delete unused tags
+ $this->addSql("
+ DELETE FROM ".$this->getTable('tag')."
+ WHERE id IN (".implode(',', $ids).")"
+ );
+ }
+ }
+
+ // Iterate over all tags to lowercase them
+ $this->addSql("
+ UPDATE ".$this->getTable('tag')."
+ SET label = LOWER(label)"
+ );
+ }
+
+ /**
+ * @param Schema $schema
+ */
+ public function down(Schema $schema)
+ {
+ throw new SkipMigrationException('Too complex ...');
+ }
+}