Firebase task.result？.HTTP云函数调用中返回null的数据

我支持以下代码：

private fun search(g: String, l: GeoPoint): Task<String> {
    val data = hashMapOf(
        "uid" to user.uid,
        "first_name" to user.first_name,
        "age" to user.age,
        "gender" to user.gender,
        "bio" to user.bio,
        "img1" to user.img1,
        "img2" to user.img2,
        "latitude" to l.latitude.toString(),
        "longitude" to l.longitude.toString(),
        "g" to g,
        "fcmToken" to fcmToken,
        "pronoun" to if (user.gender == "male") "him" else "her"
    )
    log("data: $data") // successfully logs all values as non-null
    return functions
        .getHttpsCallable("searchNearby")
        .call(data)
        .continueWith { task ->
            log("result: ${task.result?.data}")
            // This continuation runs on either success or failure, but if the task
            // has failed then result will throw an Exception which will be
            // propagated down.
            val result = task.result?.data as String
            result
        }
        .addOnSuccessListener { result ->
            log("search(): success $result")
        }
        .addOnFailureListener { exception ->
            log("search(): exception $exception") // exception kotlin.TypeCastException: null cannot be cast to non-null type kotlin.String
            log("search(): localMsg ${exception.localizedMessage}") // localMsg null cannot be cast to non-null type kotlin.String
            log("search(): cause ${exception.cause}") // cause null
            log("search(): msg ${exception.message}") // msg null cannot be cast to non-null type kotlin.String

        }
}

---

文档已成功创建，并且

{result:“successfully created document”}

已成功发送回客户端，但它仍引发异常

java.util.HashMap无法转换为java.lang.String

。知道问题出在哪里吗？调试起来也特别困难，因为它没有告诉您“我的云”函数中的错误是什么。

您正在从可调用函数向客户端返回一个JavaScript对象：

const functions = require('firebase-functions');
const admin = require('firebase-admin');

admin.initializeApp();
const db = admin.firestore();
const geofirestore = require('geofirestore');
const { GeoCollectionReference, GeoFirestore, GeoQuery, GeoQuerySnapshot } = require('geofirestore');
const user = {};

exports.searchNearby = functions.https.onCall((data, context) => {
    return admin.firestore().collection('blocks').add({
        user1name: "1142",
        user1bio: data.bio,
        user1img1: data.img1,
        user1img2: data.img2,
        user1fcmToken: data.fcmToken,
        user1pronoun: data.pronoun
    }).then(result => {
        console.log("Successfully created document");
        return { result: "Successfully created document" };
    }).catch(error => {
        console.log("Error creating document " + error);
        return { errorCreatingDocument: error };
    });
});

return { result: "Successfully created document" };

该对象包含一个名为

result

的属性。因为您的函数返回一个对象，所以您的客户机需要假定可调用的结果是一个映射。地图将有一个单独的条目，其键也被命名为

result

。如果您只需在此处记录

result

的值，这应该很容易验证：

val result = task.result?.data

与其将其转换为字符串，不如将其转换为

Map

，然后从中提取名为

result

的条目：

val data = task.result?.data as Map<String, *>
val result = data["result"]

---

由于这可能是由于Kotlin代码和云函数代码之间的交互，请将您的问题也编辑为。我们需要能够看到函数的输出。它可能没有生成您所期望的。啊，我认为错误应该出现在我的Kotlin代码中。我现在将尝试调试我的云函数-谢谢。我现在在edit@DougStevenson中添加了一个类似的问题-文档已成功创建并向客户端返回一个值，但我仍然收到一个错误。谢谢，我错过了那里的演员阵容-将其更改为

Map

修复了该问题

return "Successfully created document";