Question

我的数据库结构如下所示。我要做的是编写一个Firebase触发器，当'/ SCORES'节点的任何部分更新时，它将获得PlayerID的RoundScore并更新现有记录。

"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"
          }
     },
        "TEAM B" : {
          "54" : {
            "emoji" : " ",
            "playerName" : "Person C",
            "position" : "POS"
          },
          "89" : {
            "emoji" : " ",
            "playerName" : "Person D",
            "position" : "POS"
          }
     },
        "TEAM C" : {
          "227" : {
            "emoji" : " ",
            "playerName" : "Person E",
            "position" : "POS"
          },
          "234" : {
            "emoji" : " ",
            "playerName" : "Person F",
            "position" : "POS"
          }
     },
        "TEAM D" : {
          "239" : {
            "emoji" : " ",
            "playerName" : "Person G",
            "position" : "POS"
          },
          "280" : {
            "emoji" : " ",
            "playerName" : "Person H",
            "position" : "POS"
          }
        }
      }
    }
  }
}

所以我希望数据库在触发后看起来像。

"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
              },
            },
        },
    }

到目前为止，我所写的内容仅适用于硬编码的teamID（上例中的TEAM A）。

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);

Answer 1

你真的离它不远！以下代码应该有效。以下是几点评论：

因为你想要触发＆＃34;当＆＃39; / SCORES＆＃39;节点更新＆＃34;，您应该使用onCreate()的其他触发器，例如onUpdate()。请注意，您必须使用change.after.val();代替snap.val();。
您必须找到一种方法来设置teamId的值。这不起作用：...roundId + '/{teamId}/' + playerId....
您必须从Promise.reject

update()

    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"; //<- adapt according to your needs

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

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

       });

Firebase触发器返回另一个节点密钥以进行更新调用

1 个答案: