public function up()
{
$table = Vote::tableName();
$this->createTable($table, ['answer_id' => $this->integer(), 'user_id' => $this->integer(), 'created_at' => $this->integer()]);
MigrationHelper::addForeignKey($table, 'answer_id', Answer::tableName(), 'id', 'CASCADE', 'CASCADE');
MigrationHelper::addForeignKey($table, 'user_id', User::tableName(), 'id', 'SET NULL', 'CASCADE');
}
/**
* @return \yii\db\ActiveQuery
*/
public function getAnswer()
{
return $this->hasOne(Answer::className(), ['id' => 'answer_id'])->from(['answer' => Answer::tableName()]);
}
public function down()
{
$this->dropTable(Answer::tableName());
}
