How to Set Multiple Data as Array in Firestore

Question

I have tried to store a Map of data with set method, but everytime it overwrites the data in firebase. With update method setting that same Map of data works, it does not overwrite, but creates a new array and stores it.

I want to store the location entry data in this format. How can I achieve that with set method not with update method, cause update method requires a collection and document to already exist, but in my case they will be automatically created based on uid of the logged in user.

Here is my code for the Map and sending data to firebase.

uploadLoacationEntryData(
  locationName, fullAddress, visitTime, visitDate, entryDate) async {
Map<String, dynamic> locationMap = {
  "locationName": locationName,
  "fullAddress": fullAddress,
  "visitTime": visitTime,
  "visitDate": visitDate,
  "entryDate": entryDate,
};
//await _locationEntryDA.setUserLocationEntry(locationMap);
await _locationEntryDA.updateUserLocationEntry(locationMap);}



Future setUserLocationEntry(locationMap) async {
return await _firestore
    .collection("LocationEntry")
    .doc(_auth.currentUser.uid)
    .set({
  "locationEntry": FieldValue.arrayUnion([locationMap])
});}



Future updateUserLocationEntry(locationMap) async {
return await _firestore
    .collection("LocationEntry")
    .doc(_auth.currentUser.uid)
    .update({
  "locationEntry": FieldValue.arrayUnion([locationMap])
});}

Frank van Puffelen · Accepted Answer · 2021-05-21 14:00:38Z

1

It sounds like you're looking for the set-and-merge operation, which in Flutter would look like:

docRef.set(
  { "locationEntry": FieldValue.arrayUnion([locationMap])}, 
  SetOptions(merge : true)
)

answered May 21, 2021 at 14:00

Frank van Puffelen

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3 Comments

Frank van Puffelen Over a year ago

It merges the new field values you specify with any existing fields. So it essentially does the same as an update(), but by using set() it will also create the document if it doesn't exist (which I think is what you asked for). Did you try the code yet? If it didn't do what you wanted, can you show what you did, what happened, and what you expected to happen?

Karimul Hasan Over a year ago

Thank you for your answer! It worked successfully.

Karimul Hasan Over a year ago

And yes, also thank you for your explanation, this is what I wanted!

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