不能在同一条路线上使用两种或多种方法

Posted 2023-03-10

【中文标题】不能在同一条路线上使用两种或多种方法

【英文标题】：can´t make your two or more methods in same route

【发布时间】：2019-01-28 04:11:03

【问题描述】：

项目链接 https://github.com/Kammikazy/project 我无法在同一条路线上获得两种或多种方法 我有代码 404 我使用 mysql nodejs 和 express 我的代码 控制器联盟

const User = require('../models/Alliances')

const findAlianca = async (connection,  req, res) => 

  const Allianca = await User.find(connection, req.session.user.username)
  if (!Allianca) 
 res.status(404).send('Nenhuma cidade encontrada.');
 return;

console.log("dddd");
          req.session.Allianca = Allianca
          res.locals.Allianca = Allianca
res.render('Administration/Alliances')
  

  module.exports = 
   findAlianca
  

路线联盟

const express = require('express')
const router = express.Router()
const connection = require('../../Config/database')
const controllerAdmin = require('../../controllers/Administration')
const controlleruser = require('../../controllers/Alliances')
router.get('/Administration/Alliances', (req, res) => controllerAdmin.findcidade3(connection, req, res))
router.get('/Administration/Alliances/limitado', (req, res) => controlleruser.findAlianca(connection, req, res))


module.exports = app => app.use('/', router)

模特联盟

const find = (连接，用户名) => 返回新的承诺（（解决，拒绝）=> connection.query(SELECT alianca.nome,alianca.N_membros,alianca.TAG FROM user INNER JOIN alianca ON user.cod_alianca=alianca.id WHERE user.username='$username', (err, result) => 如果（错误） 拒绝（错误） 别的 解决（结果） ) )

    module.exports = 
        find
    

alliance.jade

extends layout
block title
   .col-xs-6.col-xs-offset-3.col-sm-6.col-sm-offset-3
   .col-sm-4(style='width:76%')
    div.panel.panel-primary(style='height:50px') Alliances Page
    div.panel.panel-primary(style='height:700px')  fdssdklfsdklfjskldfjkldsjfl
      if locals.user.cod_alianca==null
         p You Dont Have Alliances
      else 
         br
         span Your Aliance
         span= locals.Allianca.nome
   .col-xs-2.panel-red(style='width:24%;height:100%;text-align:center')

我的应用

require('./routes/Administration/Alliances')(app)

我的连接数据库

const mysql = require('mysql')
const config = require( "./config.json" )
const connection =mysql.createConnection(
 host:config.host,
 user:config.user,
 password:config.password,
 database:config.database,
// port:config.port
);

connection.connect((err) =>
    if(err)
        console.log(err)
        process.exit(0)
    else
    console.log('database on')

)

我做错了什么，我找不到解决问题的方法

【参考方案1】：

不确定您在问什么，但是如果您想在同一路由/API 中调用多个函数，您可以执行以下操作：

使用 expressJs 你可以使用next 函数，比如：

app.get('/Administration/Alliances', (req, res, next) =>  
    //Do something here and to add data to your request use
    req.body.newData = 'newData';
    //after this just call next function
    next();
, (req, res, next) => 
    //Can continue this cycle of calling next function until last `sendResponse` function is reached.
    //Can even set `error` in request for `sendResponse` 
    req.error = "Some error";
    next();
, (req, res) => 
    if(req.error) 
        res.status(400).send(req.error);
     else 
        res.status(200).send(req.body.result);
    
);

【讨论】：

我会像这样 app.get('/Administration/Alliances', (req, res, next) => req.body.newData = 'newData'; next() ; , (req, res, next) => controllerAdmin.findcidade3(connection, req, res)); controlleruser.findAlianca(connection, req, res)); req.error = "一些错误";下一个（）; , (req, res) => if(req.error) res.status(400).send(req.error); 其他 res.status(200).send(req.body.result); );

从你的回调函数调用next函数到一个异步函数，比如： function makeDbCall (req, res, next) //make db call。 db.query('选择查询') .then ( result => req.body.result = result; next(); ) .catch( err => req.error = err; next(); ); app.get('/Administration/Alliances', makeDbCall, otherFunction, responseFunction);

你能把所有的机会都给我吗

请分享代码，这样我可以更好地帮助你。我无法理解您在寻找什么。所有这些（req、res、next）都是你的函数

知道了。你看到 router.get('/Administration/Alliances', (req, res) => controllerAdmin.findcidade3(connection, req, res));你不需要 (req, res) => 因为你在这个函数中什么都不做，只是调用 controllerAdmin.findcidade3 。另外，我希望您在调用 controllerAdmin.findcidade3 时注意到您正在传递 3 个参数连接、req、res，但是您的 (req, res) => 函数只有 2 个参数，因此您在 findcidade3 中的 res 是 undefined。这应该类似于 router.get('/Administration/Alliances', controllerAdmin.findcidade3);

【参考方案2】：

我的问题的解决方案

const express = require('express')
    const router = express.Router()
    const connection = require('../../Config/database')
    const controllerAdmin = require('../../controllers/Administration')
    const controlleruser = require('../../controllers/Alliances')

    router.get('/Administration/Alliances', (req, res, next) => 
        //Do something here and to add data to your request use
      controllerAdmin.findcidade3(connection, req, res)
        next();
    , (req, res, next) => 
        //Can continue this cycle of calling next function until last `sendResponse` function is reached.
        //Can even set `error` in request for `sendResponse`
      controlleruser.findAlianca(connection, req, res)
    )
   module.exports = app => app.use('/', router)