CODEWITHSUNDEEP
fluttergoogle-cloud-firestore
Mr Jax
Mr Jax

Reputation: 1017

Flutter: add data to Map (instead of replacing data)

The following transaction completely replaces the data in a Firestore Map when run:

DocumentSnapshot docSnapshot = await tx.get(docRef); // doc Snapshot
  if (docSnapshot.exists) {
    await tx.update(
      docRef,
        <String, dynamic>{
          'Users': {
            'user.uid': {'name': user.displayName, 'date': DateTime.now()},
              }
            },
          );

What would be the correct way to add to a map instead of replacing the existing data, the same way FieldValue.arrayUnion works?

Upvotes: 1

Views: 160

Answers (1)

ZeRj
ZeRj

Reputation: 1708

Since you already fetched the data you could take the map out from the snapshot, replace the data there and call the update with the altered map.

Upvotes: 1

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