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我试图按照this tutorial使用node，Express和postgresql来构建API。我所有的代码都可以在Github找到。使节点API启动并运行
在我的服务器/ routes/index.js是以下（编号是行号）。
1: app.get('/api/todos', todosController.list);
2: // app.post('/api/todos/:todoId/items', todoItemsController.create);
3: app.post('/api/todos', todosController.create);
4: app.get('/api/todos/:todoId', todosController.retrieve);
5: app.put('/api/todos/:todoId', todosController.update);
6: app.delete('/api/todos/:todoId', todosController.destroy);
我有两个问题。
第一个问题是第4行和第5行不起作用（所有其他行都减去第2行）。当我使用邮递员/浏览器测试他们，我得到这个错误
ReferenceError: TodoItem is not defined
at retrieve (/Users/X-lem/Development/TestAPI/server/controllers/todos.js:25:20)
at Layer.handle [as handle_request] (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/layer.js:95:5)
at /Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:281:22
at param (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:354:14)
at param (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:365:14)
at Function.process_params (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:410:3)
at next (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:275:10)
at urlencodedParser (/Users/X-lem/Development/TestAPI/node_modules/body-parser/lib/types/urlencoded.js:91:7)
at Layer.handle [as handle_request] (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:317:13)
at /Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:335:12)
at next (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:275:10)
at jsonParser (/Users/X-lem/Development/TestAPI/node_modules/body-parser/lib/types/json.js:109:7)
at Layer.handle [as handle_request] (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:317:13)
at /Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:284:7
at Function.process_params (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:335:12)
at next (/Users/X-lem/Development/TestAPI/node_modules/express/lib/router/index.js:275:10)
其次，当我取消第2行控制台崩溃，我得到这个错误。
ReferenceError: todoItemsController is not defined
at module.exports (/Users/X-lem/Development/TestAPI/server/routes/index.js:9:40)
at Object.<anonymous> (/Users/X-lem/Development/TestAPI/app.js:16:27)
at Module._compile (module.js:612:30)
at Object.Module._extensions..js (module.js:623:10)
at Module.load (module.js:531:32)
at tryModuleLoad (module.js:494:12)
at Function.Module._load (module.js:486:3)
at Module.require (module.js:556:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (/Users/X-lem/Development/TestAPI/bin/www:3:13)
at Module._compile (module.js:612:30)
at Object.Module._extensions..js (module.js:623:10)
at Module.load (module.js:531:32)
at tryModuleLoad (module.js:494:12)
at Function.Module._load (module.js:486:3)
at Function.Module.runMain (module.js:653:10)
at startup (bootstrap_node.js:187:16)
at bootstrap_node.js:608:3
[nodemon] app crashed - waiting for file changes before starting...
我是新来的建设API的，并试图教自己如何做到这一点。我尝试了许多不同的故障排除方法，但无济于事。任何帮助表示赞赏，谢谢。