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1<?php
2
3namespace Application\Migrations;
4
5use Doctrine\DBAL\Migrations\AbstractMigration;
6use Doctrine\DBAL\Schema\Schema;
7use Symfony\Component\DependencyInjection\ContainerAwareInterface;
8use Symfony\Component\DependencyInjection\ContainerInterface;
9
10/**
11 * Changed tags to lowercase.
12 */
13class Version20170719231144 extends AbstractMigration implements ContainerAwareInterface
14{
15 /**
16 * @var ContainerInterface
17 */
18 private $container;
19
20 public function setContainer(ContainerInterface $container = null)
21 {
22 $this->container = $container;
23 }
24
25 /**
26 * @param Schema $schema
27 */
28 public function up(Schema $schema)
29 {
30 $this->skipIf($this->connection->getDatabasePlatform()->getName() === 'sqlite', 'Migration can only be executed safely on \'mysql\' or \'postgresql\'.');
31
32 // Find tags which need to be merged
33 $dupTags = $this->connection->query('
34 SELECT LOWER(label)
35 FROM ' . $this->getTable('tag') . '
36 GROUP BY LOWER(label)
37 HAVING COUNT(*) > 1'
38 );
39 $dupTags->execute();
40
41 foreach ($dupTags->fetchAll() as $duplicates) {
42 $label = $duplicates['LOWER(label)'];
43
44 // Retrieve all duplicate tags for a given tag
45 $tags = $this->connection->query('
46 SELECT id
47 FROM ' . $this->getTable('tag') . "
48 WHERE LOWER(label) = '" . $label . "'
49 ORDER BY id ASC"
50 );
51 $tags->execute();
52
53 $first = true;
54 $newId = null;
55 $ids = [];
56
57 foreach ($tags->fetchAll() as $tag) {
58 // Ignore the first tag as we use it as the new reference tag
59 if ($first) {
60 $first = false;
61 $newId = $tag['id'];
62 } else {
63 $ids[] = $tag['id'];
64 }
65 }
66
67 // Just in case...
68 if (count($ids) > 0) {
69 // Merge tags
70 $this->addSql('
71 UPDATE ' . $this->getTable('entry_tag') . '
72 SET tag_id = ' . $newId . '
73 WHERE tag_id IN (' . implode(',', $ids) . ')'
74 );
75
76 // Delete unused tags
77 $this->addSql('
78 DELETE FROM ' . $this->getTable('tag') . '
79 WHERE id IN (' . implode(',', $ids) . ')'
80 );
81 }
82 }
83
84 // Iterate over all tags to lowercase them
85 $this->addSql('
86 UPDATE ' . $this->getTable('tag') . '
87 SET label = LOWER(label)'
88 );
89 }
90
91 /**
92 * @param Schema $schema
93 */
94 public function down(Schema $schema)
95 {
96 throw new SkipMigrationException('Too complex ...');
97 }
98
99 private function getTable($tableName)
100 {
101 return $this->container->getParameter('database_table_prefix') . $tableName;
102 }
103}