Migrate database to remove alias and keep only one address per user

db/migrations/20181108145741_une_seule_adresse.php

+<?php
+
+
+use Phinx\Migration\AbstractMigration;
+
+class UneSeuleAdresse extends AbstractMigration
+{
+    /**
+     * Change Method.
+     *
+     * Write your reversible migrations using this method.
+     *
+     * More information on writing migrations is available here:
+     * http://docs.phinx.org/en/latest/migrations.html#the-abstractmigration-class
+     *
+     * The following commands can be used in this method and Phinx will
+     * automatically reverse them when rolling back:
+     *
+     *    createTable
+     *    renameTable
+     *    addColumn
+     *    addCustomColumn
+     *    renameColumn
+     *    addIndex
+     *    addForeignKey
+     *
+     * Any other destructive changes will result in an error when trying to
+     * rollback the migration.
+     *
+     * Remember to call "create()" or "update()" and NOT "save()" when working
+     * with the Table class.
+     */
+    public function up()
+    {
+        // Removing the alias <> user_id index
+        $table = $this->table('adresses');
+        $table->removeIndex(['alias', 'user_id'])
+            ->save();
+
+        // Deleting all addresses, to be sure we don't have doubles
+        $this->execute('TRUNCATE TABLE adresses;');
+
+        // Add a unique index on user_id
+        $table->addIndex(['user_id'], ['unique' => true])
+            ->removeColumn('alias')
+            ->save();
+
+    }
+
+    public function down() {
+        $table = $this->table('adresses');
+        $table->addColumn('alias', 'string')
+            ->removeIndex(['user_id'])
+            ->save();
+        $table->addIndex(['alias', 'user_id'], ['unique' => true])
+            ->save();
+    }
+}