Question

我有一个可以正常工作的Firebase Cloud功能（它以Admin身份写入我的数据库，并检查具有电子邮件字符串ID的现有条目）。我的问题是，它无法将数据正确地返回到客户端应用程序。

当我跟踪result的值时，它是{data: null}

如果电子邮件存在，我也想抛出一个错误，但是它抱怨未处理的承诺（请参见下面代码中的注释）。

所以这里有两个问题。首先是最紧迫的。

exports.saveData = functions.https.onCall( (data, context) => {

    // check if the email exists
    admin.database().ref('competition_entries/' + data.compId + '/' + data.emailStringId).once('value').then(function(snapshot) {
        if (snapshot.val() == null){

          console.log("Writing data to "+data.compId+" : "+data.emailStringId);

          let current_datetime = new Date()
          let formatted_time = current_datetime.getHours() + ":" + current_datetime.getMinutes() + ":" + current_datetime.getSeconds();
          let formatted_date = current_datetime.getDate() + "/" + (current_datetime.getMonth() + 1) + "/" + current_datetime.getFullYear();
          let timestamp_string = formatted_time+" "+formatted_date;
          console.log(formatted_date)

          admin.database().ref('competition_entries/' + data.compId + '/' + data.emailStringId).set({
            name: data.name,
            email: data.email,
            phone: data.phone,
            selectedItem: data.selectedItem,
            submitted_date: timestamp_string
          })
          .then(() => {
            console.log("success");
            return {
              "error": "none",
              "message": "success"
            };
          }).catch(function(error) {
            throw error;
          });

        }else{
            // email address exists as a data entry so tell the user that they have already submitted
            let code = "already-exists";
            let message = "Email address already exists";
            let details = "A user with the same email address has already entered the competition.";
            console.log(message+"/"+details);

            /*
              TODO: throwing an HttpsError directly here was causing an unresolved promise error. This would be the better way to tell the client that the user has already submitted their data.
            */
            // throw error;
            //throw new functions.https.HttpsError(code, message, details);

            // this resolves the promise error but is a hack
            return {
              error: new functions.https.HttpsError(code, message, details),
              message: message
            }
        }
    }).catch(function(error) {
      throw error;
    });
});

Answer 1

我认为问题是您退回的钱不够。函数需要每个函数返回成功执行的内容。

Commonly是return true或return Promise

所以应该是这样的：

//check if email exist
return admin.databse...

    //If there is no user create it
     return.admin...

代码确实写入了数据库，但是由于它不是异步发生的返回，因此代码将自上而下地继续执行，从而使函数能够对客户端做出响应。

您应该

if (!snapshot)短路比较好，因为快照可能未定义，当checkinf如果快照数据为null时会导致异常
您无需对数据库使用admin sdk，Functions被视为受信任的环境，因此可以使用admin特权运行操作。尽管有规则或用户限制，您仍然可以CRUD任何东西

Firebase函数返回空数据对象

1 个答案: