m180627_093149_alter_table_comments.php
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<?php
use yii\db\Migration;
/**
* Class m180627_093149_alter_table_comments
*/
class m180627_093149_alter_table_comments extends Migration
{
/**
* {@inheritdoc}
*/
public function safeUp()
{
$this->dropForeignKey('comment_book_fk', 'comment');
$this->dropColumn('comment', 'book_id');
$this->addColumn('comment', 'entity', $this->string());
$this->addColumn('comment', 'entity_id', $this->integer());
}
/**
* {@inheritdoc}
*/
public function safeDown()
{
echo "m180627_093149_alter_table_comments cannot be reverted.\n";
return false;
}
/*
// Use up()/down() to run migration code without a transaction.
public function up()
{
}
public function down()
{
echo "m180627_093149_alter_table_comments cannot be reverted.\n";
return false;
}
*/
}