Proposed migrations fix

ads.php

<?php 

use Phalcon\Db\Column;
use Phalcon\Db\Index;
use Phalcon\Mvc\Model\Migration;

class AdsMigration_1010 extends Migration
{

    const TABLE_NAME = 'ads';

    public function up()
    {
        /** @var \Phalcon\Db\Adapter\Pdo\Mysql $db */
        $db = self::$_connection;

        $columns = $db->describeColumns(self::TABLE_NAME);
        $columnNames = array_map(function (Column $column) {
            return $column->getName();
        }, $columns);

        $id = new Column('id', [
            'type' => Column::TYPE_INTEGER,
            'notNull' => true,
            'autoIncrement' => true,
            'size' => 11,
            'first' => true
        ]);

        if (array_key_exists($id->getName(), $columnNames)) {
            $db->modifyColumn(self::TABLE_NAME, null, $id);
        } else {
            $db->addColumn(self::TABLE_NAME, null, $id);
        }

        $publisherId = new Column('publisher_id', [
            'type' => Column::TYPE_INTEGER,
            'size' => 11,
            'after' => 'status'
        ]);

        if (array_key_exists($publisherId->getName(), $columnNames)) {
            $db->modifyColumn(self::TABLE_NAME, null, $publisherId);
        } else {
            $db->addColumn(self::TABLE_NAME, null, $publisherId);
        }

        $lastCheckDate = new Column('last_check_date', [
            'type' => Column::TYPE_DATETIME,
            'after' => 'publisher_id',
        ]);

        if (array_key_exists($lastCheckDate->getName(), $columnNames)) {
            $db->modifyColumn(self::TABLE_NAME, null, $lastCheckDate);
        } else {
            $db->addColumn(self::TABLE_NAME, null, $lastCheckDate);
        }

        $indexes = $db->describeIndexes(self::TABLE_NAME);
        $indexNames = array_map(function (Index $index) {
            return $index->getName();
        }, $indexes);

        if (array_key_exists('last_check_date', $indexNames)) {
            $db->dropIndex(self::TABLE_NAME, null, 'last_check_date');
        }
        $db->addIndex(self::TABLE_NAME, null, new Index('last_check_date', ['last_check_date']));
    }

    public function down()
    {
        /** @var \Phalcon\Db\Adapter\Pdo\Mysql $db */
        $db = self::$_connection;

        $id = new Column('id', [
            'type' => Column::TYPE_INTEGER,
            'notNull' => true,
            'autoIncrement' => true,
            'size' => 4,
            'first' => true
        ]);
        $db->modifyColumn(self::TABLE_NAME, null, $id);

        $publisherId = new Column('publisher_id', [
            'type' => Column::TYPE_INTEGER,
            'size' => 4,
            'after' => 'status'
        ]);
        $db->modifyColumn(self::TABLE_NAME, null, $publisherId);

        $db->dropIndex(self::TABLE_NAME, null, 'last_check_date');
        $db->dropColumn(self::TABLE_NAME, null, 'last_check_date');
    }
}