firebase.firestore.Document.onCreate - Reference.set failed: First argument contains undefined

[Jorge Willian Alvarado Jiménez]

I have created a firebase function that listen on onCreate event, however the DocumentSnapshot.data() is returning empty.

The function code is:

exports.createClientAccount = functions.firestore
  .document('/userProfile/{userId}/clientList/{clientId}')
  .onCreate(async (snap, context) => {
    console.log('****snap.data(): ', snap.data()); //Showing Empty from the console.
    return admin
      .auth()
      .createUser({
        uid: context.params.clientId,
        email: snap.data().email,
        password: '123456789',
        displayName: snap.data().fullName,
      })
      .then(userRecord => {
        return admin
          .database()
          .ref(`/userProfile/${userRecord.uid}`)
          .set({
            fullName: userRecord.displayName, //ERROR here: Reference.set failed: First argument contains undefined
            email: userRecord.email,
            coachId: context.params.userId,
            admin: false,
            startingWeight: snap.data().startingWeight,
          });
      })
      .catch(error => {
        console.error('****Error creating new user',error);
      });
  });

The document IS created on the firebase database under

/userProfile/{userId}/clientList/{clientId}


As per the documentation, onCreate listens when a new document is 
created and returns the snapshot of the data created through the 
DocumentSnapshot interface. However, I have checked from the console 
that snap.data() is empty. I don't understand why it is empty if the 
document is created successfully on the database. 

From the function code, return admin.auth.createUser({}) is creating the user as anonymous because snap.data().email is undefined, but it should create a non anonymous user.

[Kato Richardson]

Hi Jorge,

You haven't included your createUser() method, nor the process showing how the data is getting created. If you can encapsulate this and turn it into a smallish repro, I'd be happy to try it out and see if I can produce the same results.

Without further context, it looks like the doc is getting created separate from the fields being written--based simply on the log output you shared, which shows that snap.data() is a completely empty object.

☼, Kato

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[Jorge Willian Alvarado Jiménez]

Hi Kato, I was able to resolve this. Problem was that when I invoke the function for creating the document:

firestore.collection.add({})

I was calling it without any field parameters.

I modified the code so the document is added with the fields, so the when the cloud function is triggered the DocumentSnapshot.data() is not empty.

  async clientCreate(
    fullName: string,
    email: string,
    startingWeight: number
  ): Promise<any> {
    const newClientRef = await this.firestore
      .collection(`userProfile/${this.userId}/clientList/`)
      .add({
        fullName, //I added the fields inside the .add
        email, //
        startingWeight: startingWeight * 1, //
      });
    return newClientRef.update({
      id: newClientRef.id
    });
  }

Previous version of the code was creating the document reference only by invoking .add({}) and immediately I called the .update({}) but the cloud function gets triggered after .add({}) so it never was able to grab the recently updated fields, so DocumentSnapshot.data() was empty. 

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[Kato Richardson]

Nice! Glad that (lucky) guess was helpful.

☼, Kato

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