What is the process for including an item in an array within Firestore?

Can someone help me with this code snippet I'm working on:

await firebase.firestore().doc(`documents/${documentData.id}`).update({
    predictionHistory: firebase.firestore.FieldValue.arrayUnion(...[predictions])
});

The predictions variable is an array defined as:

export interface PredictionHistory {
    predictedAt: firebase.firestore.Timestamp;
    predictionText: string;
}

When I run this code, I encounter the following error:

FirebaseError: Function FieldValue.arrayUnion() called with invalid data. Nested arrays are not supported

Any suggestions on how to fix this issue?

javascripttypescriptfirebasegoogle-cloud-firestore

Answer №1

Perhaps simplifying the code could provide a clearer solution. Consider using:

updatePredictions: firebase.firestore.FieldValue.arrayUnion(predictions)

By doing this, only elements in the predictions array that are new to the updatePredictions field will be added.

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