Firebase 部署错误：无法配置触发器

Question

我在本教程中有以下示例函数：Asynchronous Programming (I Promise!) with Cloud Functions for Firebase - Firecasts

exports.emailEmployeeReport = functions.database
.ref('/employees/${eid}/reports/${rid}')
.onWrite(event => {
    const eid = event.params.eid;
    const report = event.data.val().report;
    const root = event.data.ref.root;
    const mgr_promise = root.child(`/employees/${eid}/manager`).once('value');
    const then_promise = mgr_promise.then(snap => {
        const mgr_id = snap.val();
        const email_promise = root.child(`/employees/${mgr_id}/email`).once('value');
        return email_promise;
    }).catch(reason => {
        // Handle the error
        console.log(reason);
    });;
    const then_promise2 = then_promise.then(snap => {
        const email = snap.val();
        const emailReportPromise = sendReportEmail(email, report);
        return emailReportPromise;
    }).catch(reason => {
        // Handle the error
        console.log(reason);
    });
    return then_promise2;
});

var sendReportEmail = function (email, report) {
    const myFirstPromise = new Promise((resolve, reject) => {
        // do something asynchronous which eventually calls either:
        //
        setTimeout(function () {
            try {
                var someValue = "sendReportEmail";
                console.log(someValue);
                // fulfilled
                resolve(someValue);
            }
            catch (ex) {
                // rejected
                reject(ex);
            }
        }, 2000);
    });
    return myFirstPromise;
}

一旦我运行firebase deploy 命令，最终我会收到以下错误：

functions[emailEmployeeReport]：部署错误：配置失败 扳机 提供者/google.firebase.database/eventTypes/ref.write@firebaseio.com （电子邮件员工报告）

我也有一个简单的 hello-world 方法和一个类似的触发方法，它们部署得很好。

我错过了什么吗？

Answer 1

数据库参考中通配符的语法没有“$”。

尝试以下方法：

exports.emailEmployeeReport = functions.database .ref('/employees/{eid}/reports/{rid}')