Trigger in Firebase returns a different node key when making an update request

Question

Trigger in Firebase returns a different node key when making an update request

Examining my database structure, I am aiming to create a Firebase trigger that will update the RoundScore for a specific PlayerID whenever any section of the '/SCORES' node is modified.

"SCORES" : {
       "2017" : {
         "Round_1" : {
           "3" : {
             "Emoji" : "",
             "PlayerName" : "Person A",
             "RoundScore" : 100
               },
           },
       },
   },

"SELECTIONS" : {
    "2015" : {
      "Round_1" : {
        "TEAM A" : {
          "18" : {
            "emoji" : " ",
            "playerName" : "Person A",
            "position" : "POS"
          },
          "19" : {
            "emoji" : " ",
            "playerName" : "Person B",
            "position" : "POS"
          }
     },
        // more team data...
      }
    }
}

The desired outcome after triggering this change in the database is as follows:

"SCORES" : {
        "2017" : {
          "Round_1" : {
            "3" : {
              "Emoji" : "", <------------ DUPLICATE FROM HERE
              "PlayerName" : "Person A",
              "RoundScore" : 100 <------------ AND HERE
                },
            },
        },
    },

    "SELECTIONS" : {
        "2015" : {
          "Round_1" : {
            "TEAM A" : {
              "3" : {
                "emoji" : "", <------------ INSERT HERE
                "playerName" : "Person A",
                "position" : "POS"
                "RoundScore" : 100 <------------ AND HERE
              },
            },
        },
    }

Currently, my implementation only functions with a hardcoded teamID (TEAM A in the provided example).

exports.whenScoresUpdate = functions.database
    .ref('/SCORES/{yearId}/{roundId}/{playerId}')
    .onCreate((snap, context) => {  
        const newScoreData = snap.val();
        const yearId = context.params.yearId;
        const roundId = context.params.roundId;
        const playerId = context.params.playerId;
        const scoreObj = {
            "RoundScore" : newScoreData.RoundScore,
            "Emoji" : newScoreData.Emoji,
        }; 
    return admin.database().ref('/SELECTIONS/' + yearId + '/' + roundId + '/{teamId}/' + playerId).update(scoreObj);

javascript firebase firebase-realtime-database google-cloud-functions

Answer 1

Answer №1

Just a little bit more tweaking and you're there! Have a look at the revised code snippet below for some pointers:

If you want to trigger an action "when any part of the '/SCORES' node updates", consider using the onUpdate() trigger instead of onCreate(). Remember to access the updated value with change.after.val(); instead of snap.val();
Make sure to correctly define the teamId variable in your code. The expression '
```
...roundId + '/{teamId}/' + playerId....
```
' might not give you the desired results;
Handle any potential errors from the update() function by catching possible Promise.reject instances;

    exports.whenScoresUpdate = functions.database
      .ref('/SCORES/{yearId}/{roundId}/{playerId}')
      .onUpdate((change, context) => {

        const newScoreData = change.after.val();

        const yearId = context.params.yearId;
        const roundId = context.params.roundId;
        const playerId = context.params.playerId;

        const teamID = "A"; //<- adjust as needed

        const scoreObj = {
            "RoundScore": newScoreData.RoundScore,
            "Emoji": newScoreData.Emoji,
        };

        return admin.database().ref('/SELECTIONS/' + yearId + '/' + roundId + '/' + teamId + '/' + playerId).update(scoreObj)
            .catch(error => {
                console.log(error);
                //...
            });

       });

Answer 2

Just a little bit more tweaking and you're there! Have a look at the revised code snippet below for some pointers:

If you want to trigger an action "when any part of the '/SCORES' node updates", consider using the onUpdate() trigger instead of onCreate(). Remember to access the updated value with change.after.val(); instead of snap.val();
Make sure to correctly define the teamId variable in your code. The expression '
```
...roundId + '/{teamId}/' + playerId....
```
' might not give you the desired results;
Handle any potential errors from the update() function by catching possible Promise.reject instances;

    exports.whenScoresUpdate = functions.database
      .ref('/SCORES/{yearId}/{roundId}/{playerId}')
      .onUpdate((change, context) => {

        const newScoreData = change.after.val();

        const yearId = context.params.yearId;
        const roundId = context.params.roundId;
        const playerId = context.params.playerId;

        const teamID = "A"; //<- adjust as needed

        const scoreObj = {
            "RoundScore": newScoreData.RoundScore,
            "Emoji": newScoreData.Emoji,
        };

        return admin.database().ref('/SELECTIONS/' + yearId + '/' + roundId + '/' + teamId + '/' + playerId).update(scoreObj)
            .catch(error => {
                console.log(error);
                //...
            });

       });

Trigger in Firebase returns a different node key when making an update request

Answer №1

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