Question 236266 in Firebase Question posted in
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Firebase – Cloud Functions: using "where" query, can't get the docID Nodejs

I’m using "where" query to get a single document so that I can update it. I need the docID which is what i’m struggling with. I’m following the documentation but not much progress. I’m using Firebase cloud functions, Nodejs and Javascript.

const admin = require("firebase-admin");
const firestore = admin.firestore();

exports.bucketTesting = functions.https.onRequest(async (req, res) => {

//code to source file.metadata.mediaLink

  const imagesRef = firestore.collection("images");
  const specificImageRef = await imagesRef
    .where("imageUrl", "==", file.metadata.mediaLink)
    .get();
  console.log(specificImageRef);

  specificImageRef.forEach((doc) => {
    console.log(doc.id, "=>", doc.data());
  });
}

The console.log(specificImageRef) print data(that i can’t use) but the console.logs in the forEach do not print anything.

How do I get the docID?

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2

Answers


  1. 0

    Your comment: "How do i get a document or the docID?"

    Your code is correct to get the document docID and data but as discussed in the comments the query returns 0 documents.

    The only adaptation you could do since you are sure that there is only one document corresponding to the query is to use the docs array as follows:

    exports.bucketTesting = functions.https.onRequest(async (req, res) => {

  const imagesRef = firestore.collection("images");
  const querySnapshot = await imagesRef
          .where("imageUrl", "==", file.metadata.mediaLink)
          .get();

  if (querySnapshot.size === 0) {
     // No document found
     // Send back a message or an error
     res.status(500).send("No document found");
  } else {
     const uniqueDocSnapshot = querySnapshot.docs[0];
     console.log(uniqueDocSnapshot.id, "=>", uniqueDocSnapshot.data());

     res.send(...);
  }

        


})
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  2. 0 
    const admin = require("firebase-admin");
const firestore = admin.firestore();

exports.bucketTesting = functions.https.onRequest(async (req, res) => {

  //code to source file.metadata.mediaLink

  const imagesRef = firestore.collection("images");
  
  // the following will return an array 
  const specificImages = (await imagesRef
    .where("imageUrl", "==", file.metadata.mediaLink)
    .get()).docs.map(each => each.data()) || [];
    
    
  /* the console log on the next line will show the array
  it will show multiple items if there is more than one document
  where imageUrl === file.metadata.mediaLink */
  console.log(specificImages);
  
  /* all is left to do is to return the array 
    or return a single document */
    
  // the following is the case when you are just returning a single document
  res.send({
    desiredData: specificImages?.[0] ?? {} // fallback if there is no document
  })
}
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