javascript - 为什么我无法使用 Express' Router() 和 'GET' 方法访问我的参数

Question

我在 Angular 服务“PostSvc”上有一个重载的获取函数如果提供用户作为参数，则想法是仅返回该用户发布的内容。否则从数据库中获取所有帖子......

用户是一个从 post.ctrl.js 传递的“对象”，具有以下键

{
    username: $scope.currentUser,
    body: $scope.postBody,
    user_id: $scope.currentUser._id
}

这给了我 _id 字段 mongodb/mongoose 按预期生成

console.log($scope.currentUser._id)

这是 Mongoose Post 模型:

var db = require('../db')

var Post = db.model('Post', {
    username : { type: String, required: true },
    body : { type: String, required: true },
    user_id: { type: String, required: true },
    date : { type: String, required: true, default: Date.now },
})

module.exports = Post

以下是分配路由器的 server.js 文件的片段:

app.use("/api/posts", require("./controllers/api/posts"))

这是 Express './controllers/api/post.js' 路由器:

var Post = require('../../models/post')

var router = require('express').Router()

var websockets = require('../../websockets')


// this route works just fine
// returns All posts from the db
//
router.get("/", function(req, res, next) {
    // find all posts from db
    //
    Post.find()
    .sort("-date")
    .exec(function(err, posts) {
        if (err) { return next(err) }
        res.json(posts)
        next()
    })
})

问题......

router.get("/:user_id", function(req, res, next) {
    var query = {}

    // these messages aren't being logged to console
    // so there's no way the route is being used
    console.log("from the get 'api/posts' method" )
    console.dir(req.params.user_id)

    if (req.params.user_id) {
        query = { user_id: req.params.user_id } // sent from posts.svc.js
    }
    // this query is not executing properly
    // I have no access to the `req.params.user_id`
    // 
    Post.find({ user_id: req.params.user_id })
    .sort("-date")
    .exec(function(err, posts) {
        if (err) { return next(err) }
        res.json(posts)
        next()
    })
})

router.post("/", function(req, res, next) {
    var post = new Post({ body: req.body.body })
    if (!req.auth) { return res.sendStatus(401) }
    post.username = req.auth.username
    post.user_id = req.body.user_id
    post.save(function(err, post) {
        if (err) { return next(err) }
        websockets.broadcast("new_post", post)
        res.status(201).json(post)
    })
})

module.exports = router

最后但并非最不重要的一点是，Angular 服务将初始“GET”请求发送到“server.js”->“./controllers/api/posts.js”并等待响应:

angular.module("app").service('PostsSvc', function($http) {
    this.fetch = function(user) {
        var credentials = {}
        if (user) {
            credentials = user

            // checkpoint
            //
            console.dir("from the fetch function " + credentials._id)
            // only return authencated users posts
            return $http.get("/api/posts", {
                params: {
                    user_id: credentials._id // to the posts.js router
                }
            })


            // return all posts otherwise
        } else { return $http.get("/api/posts") }


    }

    this.create = function(post) {
        return $http.post("/api/posts", post)
    }
})

Answer 1

我在express中的router.get也遇到了同样的麻烦。 body 是空的。我最终转而使用 router.post() ，它非常适合我，只要您还使用带 Angular post 请求调用 api。