云函数中Firebase子集合中的复合查询？

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

exports.exampleFunction = functions.https.onRequest(async (req, res) => {
  const orderId = req.query.orderId;
  const minPrice = req.query.minPrice;
  const maxPrice = req.query.maxPrice;

  try {
    const itemsRef = admin.firestore().collection('orders').doc(orderId).collection('items');
    const querySnapshot = await itemsRef
      .where('price', '>=', minPrice)
      .where('price', '<=', maxPrice)
      .get();

    const items = [];
    querySnapshot.forEach((doc) => {
      items.push({ id: doc.id, ...doc.data() });
    });

    res.status(200).send(items);
  } catch (error) {
    console.error('Error fetching items:', error);
    res.status(500).send('Internal Server Error');
  }
});