Question

因此，无法使用持久存储在我的postgres db中的主干（以rails索引列表方式）呈现这些专辑：

 [#<Album id: 1, title: "abbey road", artist: "the beatles", created_at: "2013-05-24 20:35:44", updated_at: "2013-05-24 20:35:44">, #<Album id: 2, title: "Random Access Memories", artist: "Daft Punk", created_at: "2013-05-24 20:36:14", updated_at: "2013-05-24 20:36:14">, #<Album id: 3, title: "Illmatic", artist: "Nas", created_at: "2013-05-24 20:36:51", updated_at: "2013-05-24 20:36:51">]

服务器端我的索引方法是标准的

  class AlbumsController < ApplicationController
    def index
    end

和路线配置相同

resources :albums

客户端我渲染相册的主要部分看起来像这样

app.views.Home = Backbone.View.extend({

  template: JST['templates/home'],

    render: function() {
    this.$el.html(this.template());

    // Find all the albums in the system
    var albums = new app.collections.AlbumList();
    albums.fetch();
    console.log(albums);
    var _this = this;

    albums.fetch({
      success: function(albums, response, options) {
        albums.forEach(function(album) {
        _this.$el.find("#albums").append("<li><a href='#' class='album-link' data-id='" + album.id + "'>" + album.title() + "</a></li>");
        });
      }
    });

    // Add a <li> element containing a link to each profile page
    return this;
  },

});

继承AlbumList集合

app.collections.AlbumList = Backbone.Collection.extend({

  model: app.models.Album,
  url: '/albums'

});

然而，当控制台记录相册时，它的长度为0的对象 我忘记了将它链接到数据库的步骤吗？谢谢！

此外，这是服务器发送的GET请求

Started GET "/albums" for 127.0.0.1 at 2013-05-25 09:13:00 -0400
Processing by AlbumsController#index as JSON
  Album Load (0.2ms)  SELECT "albums".* FROM "albums" 
Completed 200 OK in 1ms (Views: 0.1ms | ActiveRecord: 0.2ms)

如果在控制台中手动执行上述SQL查询，将检索正确的信息。

Answer 1

服务器没有发回任何信息。配置它以JSON响应解决了它：

  def index
    @albums = Album.all

    render :json => @albums
  end

使用backbone.js从postgreSQL数据库中获取数据

1 个答案: