Question 334218 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript – Firestore how to add a new map in array with setDoc even if array with same value exists

I want to add a new map in array named players but everytime i try to add it with this code

            await setDoc(
                doc(firestore, 'gambles', gambleId),
                {
                    players: arrayUnion({
                        balanceDrop: silver,
                        id: userId,
                        login: userData.login
                    }),
                    totalPlayers: increment(1),
                    totalSilver: Number(gambleData?.totalSilver) + Number(silver)
                },
                { merge: true }
            );

and there is already a map with same values another map is not being created only totalSilver and totalPlayers values are being updated I just want another map even if values are the same
enter image description here

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2

Answers


  1. 0

    try the following.

    import { v4 as uuidv4 } from 'uuid';

const playerId = uuidv4();

await setDoc(
  doc(firestore, 'gambles', gambleId),
  {
    players: arrayUnion({
      id: playerId,
      balanceDrop: silver,
      login: userData.login
    }),
    totalPlayers: increment(1),
    totalSilver: Number(gambleData?.totalSilver) + Number(silver)
  },
  { merge: true }
);

    let me know any?

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  2. 0

    arrayUnion is behaving exactly as it’s supposed to here. It will not add new array elements that are the same as any existing elements. That’s why it’s called a "union" operation as opposed to a "push" operation. This is made clear in the documentation:

    arrayUnion() adds elements to an array but only elements not already present.

    If you want to add a duplicate element, you have to first read the document, modify the array in memory to contain whatever duplicates you want, then update the array field back to the document.

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