CakePHP I18N Table Migration

cakephp-i18n-migration.php

<?php
use Migrations\AbstractMigration;

class ArticlesI18n extends AbstractMigration
{
    /**
     * Change Method.
     *
     * More information on this method is available here:
     * http://docs.phinx.org/en/latest/migrations.html#the-change-method
     * @return void
     */
    public function change()
    {
        $table = $this->table('articles_i18n');
        $table->addColumn('locale', 'string', [
            'default' => null,
            'limit'   => 6,
            'null'    => false,
        ]);
        $table->addColumn('model', 'string', [
            'default' => null,
            'limit'   => 255,
            'null'    => false,
        ]);
        $table->addColumn('foreign_key', 'integer', [
            'default' => null,
            'limit'   => 11,
            'null'    => false,
        ]);
        $table->addColumn('field', 'string', [
            'default' => null,
            'limit'   => 255,
            'null'    => false,
        ]);
        $table->addColumn('content', 'text', [
            'default' => null,
            'null'    => false,
        ]);
        $table->addIndex(array('locale', 'model', 'foreign_key', 'field'), array('unique' => true, 'name' => 'I18N_LOCALE_FIELD'));
        $table->addIndex(array('model', 'foreign_key', 'field'), array('unique' => false, 'name' => 'I18N_FIELD'));
        $table->create();
    }
}