Backbone get（）返回undefined

Question

问题在于app.js文件中的PostRouter变量。记录this.posts.toJSON（）会返回我的数据库中的数据，但调用get传递id将返回undefined。路由在id在URL中传递并记录在我的函数中时起作用。我使用Mongo存储数据和Monk来查询数据库。

我的服务器文件

//configure
app.configure(function(){
    app.use(express.json()); //parses the JSON requests being sent to the server
    app.use(express.static( path.join(__dirname, 'public') )); //serve files from the path given
});

app.get("/posts", function(req, res){
    var db = req.db;

    db.get("postscollection").find({}, function (err, results) {
        res.json(results);
    });
});

//create route using Express REST API
app.get('/*', function(req, res){
    var db = req.db;

    db.get("postscollection").find({}, function (err, results) {
        res.render("index.ejs", { posts: JSON.stringify(results) }); //pass object of values to use in template
    });
});

app.listen(3000);

我的应用文件

//Post
var Post = Backbone.Model.extend({});

//Posts
var Posts = Backbone.Collection.extend({
        model: Post,
        url: "/posts"
    });

//PostListView
var PostListView = Backbone.View.extend({
    tagName: 'li',

    template: _.template("<a href='/posts/{{_id}}'>{{title}}</a>"),

    render: function () {
        this.el.innerHTML = this.template(this.model.toJSON()); //this.model is view instance
        return this;
    },

    events: {
        'click a': 'handleClick'
    },

    handleClick: function (e) {
        e.preventDefault();
        postRouter.navigate($(e.currentTarget).attr("href"), { trigger: true }); //navigate to specified route and trigger routing
    }
});

//PostsListView
var PostsListView = Backbone.View.extend({
    template: _.template("<h1>My Blog</h1><ul></ul>"),

    render: function () {
        this.el.innerHTML = this.template();

        var ul = this.$el.find("ul"); //this.$el == $(el)

        this.collection.forEach(function (post) {
            ul.append(new PostListView({ model: post }).render().el);
        });

        return this;
    }
});

//PostView
var PostView = Backbone.View.extend({        
    events: {
        'click a': 'handleClick'
    },

    initialize: function(){
        _.bindAll(this, "render");
        this.template = _.template($("#postView").html()); //to prevent template from loading before scripts
    },

    render: function () {
        var model = this.model.toJSON();

        this.el.innerHTML = this.template(model);

        return this;
    },

    handleClick: function (e) {
        e.preventDefault();
        postRouter.navigate($(e.currentTarget).attr("href"), {trigger: true});
    }
});

//PostRouter
var PostRouter = Backbone.Router.extend({
    initialize: function (options) {
        this.posts = options.posts; //the posts collection
        this.main  = options.main; //the main id div in the view
    },

    routes: {
        ''         : 'index',
        'posts/:id': 'singlePost'
    },

    index: function () {
        var pv = new PostsListView({ collection: this.posts });
        this.main.html(pv.render().el);
    },

    singlePost: function (id) {    
        console.log("view post " + id); //logs id passed
        console.log(this.posts.toJSON()); //logs data in db

        var post = this.posts.get(id); //returns undefined
        var pv = new PostView({ model: post });

        this.main.html(pv.render().el);
    }
});

索引工作正常并显示我的所有数据，但尝试查看单个帖子会破坏应用程序。