/**
* @return \yii\db\ActiveQuery
*/
public function getAmounts()
{
return $this->hasMany(Amount::className(), ['unit_id' => 'unit_id']);
}
/**
* @return \yii\db\ActiveQuery
*/
public function getAmount()
{
return $this->hasOne(Amount::className(), ['amount_id' => 'amount_id']);
}