小编Kar*_*awg的帖子

我试图搜索似乎整个互联网的内容,但我仍然对JS类的问题感到烦恼,我正在为微服务写作(仍在学习中).

所以,我尝试在实例化的对象上调用一个类方法,并根据我的知识和我的(我猜错的)单元测试它应该工作.

好吧,我将从收到的错误开始:

    GET /api/users 500 2.863 ms - 2649
TypeError: Cannot read property 'repository' of undefined
    at list (C:\Users\<user>\Documents\Programming\node\kaguwa-ngn\kaguwa-user-service\controllers\user-controller.js:20:9)
    at Layer.handle [as handle_request] (C:\Users\<user>\Documents\Programming\node\kaguwa-ngn\kaguwa-user-service\node_modules\express\lib\router\layer.js:95:5)
    at next (C:\Users\<user>\Documents\Programming\node\kaguwa-ngn\kaguwa-user-service\node_modules\express\lib\router\route.js:137:13)

(还有更多).

代码调用代码:

user-controller.js

'use strict';

var utils = require('./utils');

class UserController {

  constructor(repository) {
    this.repository = repository || {};
  }

  /**
   * 
   * Lists all users.
   * 
   * @param {object} req 
   * @param {object} res 
   */
  list(req, res) {

    this.repository.list(function (err, users) {
      if (err) return res.status(500).json(utils.createError(500));

      if (Object.keys(users).length !== 0) { …