CODEWITHSUNDEEP
firebaseflutterfirebase-realtime-database
user4282023
user4282023

Reputation:

Flutter: Realtime database, append data under specific UID

I'm trying to add a grid on every click to real-time database. However, when a new value is added, although its key is different, still database replaces the old index with new one.

To summarise, this is my intended structure:

User.UID
|
|___ 0 -> cross
|
|___ 1 -> tick
|
|___ 2 -> cross
|
|___ 3 -> tick

But I'm getting:

User.UID
|
|___ 1 -> tick

i.e: Old index 0 is replaced with new index 1.

My code is:

playGame(int index, final databaseReference) {
    if (this.gameState[index] == "empty") {
      setState(() {
        if (this.isCross) {
          this.gameState[index] = "cross";
        } else {
          this.gameState[index] = "circle";
        }
        this.isCross = !this.isCross;
        this.checkWin();
      });

      databaseReference
          .child(authUser.currentUser.uid)
          .set({index.toString(): gameState[index]});
    }

Grid:

Container(
                margin: EdgeInsets.all(15),
                height: MediaQuery.of(context).size.height / 2,
                color: Colors.white12,
                child: GridView.builder(
                  padding: EdgeInsets.only(top: 30),
                  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                      crossAxisCount: 3,
                      childAspectRatio: 1.0,
                      crossAxisSpacing: 10.0,
                      mainAxisSpacing: 10.0),
                  itemCount: 9,
                  itemBuilder: (context, i) => SizedBox(
                    child: MaterialButton(
                      onPressed: () {
                        this.playGame(i, databaseReference);
                      },
                      child: Image(
                        image: this.getImage(this.gameState[i]),
                      ),
                    ),
                  ),
                ),
              ),

Can anyone please help how can I fix this?

Upvotes: 3

Views: 625

Answers (1)

Frank van Puffelen
Frank van Puffelen

Reputation: 599571

When you call set(...) on a location, it sets the values you pass to that location, overwriting any existing value(s) at the location.

If you want to only update specific keys in the location, use the update(...) method. So in your case that'd me:

databaseReference
  .child(authUser.currentUser.uid)
  .update({index.toString(): gameState[index]});

Upvotes: 2

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