how can I update multiple values in a firestore map using only one write without overwriting the ent-CodePudding

this code will overwrite the entire map in firestore

Map<String, String> map = {};
for (MapEntry e in someGientMap.entries) {
  map[e.key] = e.value;
}
await db.doc('document path').update({
  'FirestoreGiantMap': map,
});

and this code will write the document too many times

for (MapEntry e in someGientMap.entries) {
  await db.doc('document path').update({
    'FirestoreGiantMap.${e.key}: e.value,
  });
}

CodePudding user response：

You're almost there. Combing the two techniques leads to:

Map<String, String> map = {};
for (MapEntry e in someGientMap.entries) {
  var key = 'FirestoreGiantMap.'   e.key;
  map[key] = e.value;
}
await db.doc('document path').update(map);