Created new entity Tag and migration to create new tables

data/migrations/Version20160820191203.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace ShlinkMigrations;
+
+use Doctrine\DBAL\Migrations\AbstractMigration;
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\DBAL\Types\Type;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+class Version20160820191203 extends AbstractMigration
+{
+    /**
+     * @param Schema $schema
+     */
+    public function up(Schema $schema)
+    {
+        $this->createTagsTable($schema);
+        $this->createShortUrlsInTagsTable($schema);
+    }
+
+    protected function createTagsTable(Schema $schema)
+    {
+        $table = $schema->createTable('tags');
+        $table->addColumn('id', Type::BIGINT, [
+            'unsigned' => true,
+            'autoincrement' => true,
+            'notnull' => true,
+        ]);
+        $table->addColumn('name', Type::STRING, [
+            'length' => 255,
+            'notnull' => true,
+        ]);
+        $table->addUniqueIndex(['name']);
+
+        $table->setPrimaryKey(['id']);
+    }
+
+    protected function createShortUrlsInTagsTable(Schema $schema)
+    {
+        $table = $schema->createTable('short_urls_in_tags');
+        $table->addColumn('short_url_id', Type::BIGINT, [
+            'unsigned' => true,
+            'notnull' => true,
+        ]);
+        $table->addColumn('tag_id', Type::BIGINT, [
+            'unsigned' => true,
+            'notnull' => true,
+        ]);
+
+        $table->addForeignKeyConstraint('tags', ['tag_id'], ['id'], [
+            'onDelete' => 'CASCADE',
+            'onUpdate' => 'RESTRICT',
+        ]);
+        $table->addForeignKeyConstraint('short_urls', ['short_url_id'], ['id'], [
+            'onDelete' => 'CASCADE',
+            'onUpdate' => 'RESTRICT',
+        ]);
+
+        $table->setPrimaryKey(['short_url_id', 'tag_id']);
+    }
+
+    /**
+     * @param Schema $schema
+     */
+    public function down(Schema $schema)
+    {
+        $schema->dropTable('short_urls_in_tags');
+        $schema->dropTable('tags');
+    }
+}