Question

我运行了此脚本以使用猫鼬连接到MongoDB。

const mongoose = require("mongoose");
mongoose.connect("mongodb://localhost/curious", { useNewUrlParser: true });
const db = mongoose.connection;

const dbLog = (msg) => {
    console.log(`[DATABASE] [SUCCESS] ${msg}`);
}

const dbLogError = (msg) => {
    console.error(`[DATABASE] [ERROR] ${msg}`);
}

db.on("error", dbLogError("Database connection failure"));
db.once("open", () => {
    dbLog("Database connection successful");
})

mongoose.connection.close()

我收到以下错误

PS D:\scripts> node .\dbUtils.js
[DATABASE] [ERROR] Database connection failure
events.js:110
    throw new ERR_INVALID_ARG_TYPE('listener', 'Function', listener);
    ^

TypeError [ERR_INVALID_ARG_TYPE]: The "listener" argument must be of type function. Received undefined
    at checkListener (events.js:110:11)
    at _addListener (events.js:347:3)
    at NativeConnection.addListener (events.js:405:10)
    at Object.<anonymous> (D:\Workspace\curious-backend\scripts\dbUtils.js:13:4)
    at Module._compile (internal/modules/cjs/loader.js:1015:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1035:10)
    at Module.load (internal/modules/cjs/loader.js:879:32)
    at Function.Module._load (internal/modules/cjs/loader.js:724:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
    at internal/main/run_main_module.js:17:47 {
  code: 'ERR_INVALID_ARG_TYPE'
}

这是什么错误，我该如何解决？

Stackoverflow会让我在没有更多文本的情况下发帖，所以，你们所有人都过得很愉快。这是艰难的时期。爱自己，多保重。

Answer 1

看起来像问题在[BindProperty] public Cars Car { get; set; } public IList<Brands> Brands { get; set; } public void OnGet() { Brands = new List<Brands> { new Brands { Brand="teta" }, new Brands { Brand="tetb" } }; } public async Task<IActionResult> OnPost(Cars Car) { return Page(); }侦听器中，因为它期望功能。更新：

error

收件人：

db.on("error", dbLogError("Database connection failure"));

它应该可以工作！

“侦听器”参数必须是函数类型。收到未定义

1 个答案: