public function getOrderClass() { return Order::className(); }
public function getOrders() { return $this->hasMany(Order::className(), ['customer_id' => 'id'])->orderBy('created_at'); }
public function getExpensiveOrders() { return $this->hasMany(Order::className(), ['customer_id' => 'id'])->filter(['range' => ['total' => ['gte' => 50]]])->orderBy('id'); }
public function getOrder() { return $this->hasOne(Order::className(), ['id' => 'order_id']); }