javascript - 从 firebase 检索数据导致未定义

Question

我在尝试从 firebase 中拉出时遇到了这个问题。我的数据库结构如下:

我正在尝试提取merchantName及其相关分支机构的详细信息:

function getAllMerchant(){
    var query = firebase.database().ref('merchants');
    return query.once('value').then(data => {
        var result = [];
        data.forEach(snapshot => {
            var merchantData = snapshot.val();
            var merchantName = merchantData.merchantName;
            var branchName = merchantData.branches.branchName;
            var branchAddress = merchantData.branches.branchAddress;
            console.log('check ' + merchantName + ' ' +  branchName + ' ' + branchAddress);
            result.push({merchantName: merchantName, branchName: branchName, branchAddress: branchAddress});
        });
        return result;
    });
    resolve(result);
}

但是，当我打印出branchName和branchAddress时，我得到了未定义的信息。不过我设法打印出了merchantName。有什么想法吗？

谢谢!

Answer 1

您没有迭代商家的分支。

data.forEach(merchantSnapshot => {
    var merchantData = snapshot.val();
    var merchantName = merchantData.merchantName;
    console.log('check ' + merchantName);
    merchantSnapshot.child("branches").forEach(brancheSnapshot => {
        var branchName = brancheSnapshot.val().branchName;
        var branchAddress = brancheSnapshot.val.branchAddress;
        console.log('   ' + branchName + ' ' + branchAddress);
    });
});