yager-api/migrations/m230130_184544_tabla_grupos_eventos.php

<?php

use yii\db\Migration;

/**
 * Class m230130_184544_tabla_grupos_eventos
 */
class m230130_184544_tabla_grupos_eventos extends Migration {
	/**
	 * {@inheritdoc}
	 */
	public function safeUp() {

		$this->createTable("EventoGrupo", [
      "idEvento" => $this->integer(),
      "idGrupo" => $this->integer(),
    ]);
		$this->addPrimaryKey('EventoGrupoPK', 'EventoGrupo', ['idEvento', 'idGrupo']);

		$this->alterColumn("Evento", "nombre", $this->string(255)->notNull());
		$this->alterColumn("Evento", "descripcion", $this->text());
		$this->dropColumn("Evento", "idGrupo");

	}

	/**
	 * {@inheritdoc}
	 */	
	public function safeDown() {

		$this->addColumn("Evento", "idGrupo", $this->integer());
		$this->alterColumn("Evento", "descripcion", $this->string(255));
		$this->alterColumn("Evento", "nombre", $this->string(100)->notNull());

		$this->dropPrimaryKey("EventoGrupoPK", "EventoGrupo");
		$this->dropTable('EventoGrupo');
	}

}