如何解决''users | 类型的参数undefined'' 不能分配给类型为 ''users'' 的参数 “未定义”类型不能分配给“用户”类型？

我正在尝试使用 TYPEORM 创建一个 put 方法，但不明白如何修复此错误以及原因。这个请求一个typeof？但我的用户有价值。 （我是新手，当然）。

谁能帮帮我？我该如何解决？

什么时候：

 const user: any = await usersRepository.findOne(req.params.id)

所以： 没问题 （为什么）

错误：

{
    "resource": "/Users/camargo/Documents/Estudo/nodejs-1/source/server.ts","owner": "typescript","code": "2345","severity": 8,"message": "Argument of type ''users | undefined'' is not assignable to parameter of type ''users''.\n  Type ''undefined'' is not assignable to type ''users''.","source": "ts","startLineNumber": 71,"startColumn": 31,"endLineNumber": 71,"endColumn": 35
}

代码

    ** source/server.ts */
    import http from ''http'';
    import { connection } from "./connection/connection"
    import express,{ Express } from ''express'';
    import morgan from ''morgan'';
    import routes from ''./routes/posts'';
    
    
    import cors from "cors";
    import { users } from ''./entities/users'';
    
    // Setando rotas express
    
    const router: Express = express();
    const app=express()
    app.use(cors())
    app.use(express.json())
    const server=app.listen(3000,()=>{
        console.log("Server rodando... 3000....")
    })
    app.get("/api",(req,res)=>{
        res.send("API - Bem Vindo")
    })
    connection.then(
        async connection=>{
            console.log("Conectado")
          
      const usersRepository = connection.getRepository(users);
    
      app.get("/api/users/:id",async(req,res)=>{
    
        /* Metodos */
    
        //MetoDO GET 
    
        const user = await usersRepository.findOne({where: { id: req.params.id }})
        res.json({
            message:"success",payload: user
        })
    })
    
        //  MetoDO POST
    
    app.post("/api/users",async (req,res)=>{
                
        console.log("body",req.body)
        const user = await usersRepository.create(req.body)
        const results = await usersRepository.save(user);
        
    res.json({
    message: "success",payload: results
    });
    })
    
        // MetoDO DELETE
    
        app.delete("/api/users/:id",res)=>{
            const user = await usersRepository.delete(req.params.id)
            res.json({
                message:"success",})
        })
    
           
            //MetoDO PUT
    
        app.put("/api/users/:id",res)=>{
            const user = await usersRepository.findOne(req.params.id)
            usersRepository.merge(user,req.body);
            const result = await usersRepository.save(user);
            res.json({
                message:"success",payload:result
            })
      
        })
            
        
    }
    ).catch(error=>{
        console.log(error)
        
    })
    
    
    /** Conexao teste morgan */
    router.use(morgan(''dev''));
    /** Parse the req */
    router.use(express.urlencoded({ extended: false }));
    /** Takes care of JSON data */
    router.use(express.json());
    
    /** Regras da API*/
    router.use((req,res,next) => {
        // CORS 
        res.header(''Access-Control-Allow-Origin'',''*'');
        // CORS headers
        res.header(''Access-Control-Allow-Headers'',''origin,X-Requested-With,Content-Type,Accept,Authorization'');
        // CORS metodos
        if (req.method === ''OPTIONS'') {
            res.header(''Access-Control-Allow-Methods'',''GET PATCH DELETE POST'');
            return res.status(200).json({});
        }
        next();
    });
    
    /** Routes */
    router.use(''/'',routes);
    
    /** Error handling */
    router.use((req,next) => {
        const error = new Error(''not found'');
        return res.status(404).json({
            message: error.message
        });
    });
    
    /** Server */
    
    const httpServer = http.createServer(router);
    const PORT: any = process.env.PORT ?? 6060;
    httpServer.listen(PORT,() => console.log(`Server rodando em ${PORT}`));

解决方法

const user = await usersRepository.findOne(req.params.id)
if(user) {
  usersRepository.merge(user,req.body);
  const result = await usersRepository.save(user);
  res.json({
      message:"success",payload:result
  })
}
res.status(404).json({message: "user not found"})

import { Injectable } from '@angular/core';
import { Http,Response } from '@angular/http';

import 'rxjs/add/observable/throw';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/map';
import { Observable } from 'rxjs/Observable';

@Injectable()
export class AddressService {

  constructor(private http: Http) { }

  getAnything = (): Observable<Response> => {
    return this.http.get('https://my_api.com')
      .map(this.handleSuccess)
      .catch(this.handleError);
  }

  handleError = (error: Response): Observable<Response> => {
    return Observable.throw(error || 'Server Error');
  }

  handleSuccess = (response: Response): Observable<Response> => {
    let body;

    if (response.text()) {
      body = response.json();
    }

    return body || {};
  }
}

Type 'Observable<Response | Observable<Response>>' is not assignable to type 'Observable<Response>'