In my React Native project, I am utilizing Firebase Firestore as the backend database. I have successfully retrieved data from the database using the following code:
unsubscribe = firebase.firestore().collection('messages').where('user', "==", this.props.user.uid).onSnapshot(this.onCollectionUpdate)
However, I am now faced with the challenge of retrieving data where the 'user' field is an object with a nested field of id. How can I achieve this?
Suppose the document is initialized with an object such as:
let newObj = {
user: {
id: '987654'
},
additionalField: 'efgh'
};
and then created using:
documentReference.set(newObj);
To query this document, you can do the following:
firebase.firestore().collection('messages').where('user.id', "==", this.state.userId).onSnapshot(this.updateCollection)
Instead of utilizing the .where() method, a more efficient approach would be to use the .doc('insert your id here') method. This way, in your specific scenario, you would write:
.doc(obj.user.id).onSnap .....
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