下面是我的模型和集合定义：

let PhotoModel = Backbone.Model.extend({
    urlRoot: '/api/Photo',
    defaults: {
        id: "2",
        import_id: "1",
        original_filename: "",
        filename: "IMG_8199 - Version 2.jpg",
        aws_url: "https://s3.amazonaws.com/nakamoto.ca",
        aws_bucket: "nakamoto.ca",
        aws_s3_source_path: "source/2016/02/IMG_8199_-_Version_2.jpg",
        aws_s3_compressed_path: "compressed/2016/02/IMG_8199_-_Version_2.jpg_1600x1200",
        aws_s3_thumb_path: "thumb/2016/02/IMG_8199_-_Version_2.jpg_400x400",
        capture_date: "2016-02-27 18:45:02",
        upload_date: "2017-04-18 21:26:59",
        file_size: "2026722",
        width: "3264",
        length: "2448",
        camera_make: "Apple",
        camera_model: "iPhone 6 Plus",
        software: "Aperture 3.6",
        latitude: "45.225206",
        lat_ref: "N",
        longitude: "45.292572",
        lon_ref: "W",
        altitude: "0.000000",
        apple_note: "iPhone 6 Plus back camera 4.15mm f/2.2",
        iptc_headline: "",
        iptc_caption: "",
        iptc_credit: "",
        iptc_rating: "0",
        iptc_city: "",
        iptc_province_state: "",
        iptc_country: "",
        iptc_tags: "",
        favorite: "0",
        checksum: "4749e94d3eec7b6bf6a0136d8dc3457c",
        public_flag: "0",
        raw_exif: ""
    },

    parse: function(response_data) {
        return response_data.data;
    }
});

let PhotoCollection = Backbone.Collection.extend({
    url: '/api/Photo',
    model: PhotoModel,

    parse: function(response_data) {
        return response_data.data;
    }
});

下面是调用/api/Photo的输出（从Chrome检查器中复制并粘贴）：

{model: null, id: null, request: "GET", status: 1,…}
model: null
id: null
request: "GET"
status: 1
message: "grabbed some records with: SELECT * FROM `photo` WHERE 1 LIMIT 1, 10"
count: 10
page: 1
per_page: 10
data: [{id: "2", import_id: "1", original_filename: "", filename: "IMG_8199 - Version 2.jpg",…},…]
0: {id: "2", import_id: "1", original_filename: "", filename: "IMG_8199 - Version 2.jpg",…}
1: {id: "3", import_id: "1", original_filename: "", filename: "IMG_8192 - Version 2.jpg",…}
2: {id: "4", import_id: "1", original_filename: "", filename: "IMG_7961 - Version 2.jpg",…}
3: {id: "5", import_id: "1", original_filename: "", filename: "IMG_8086 - Version 2.jpg",…}
4: {id: "6", import_id: "1", original_filename: "", filename: "IMG_7947 - Version 2.jpg",…}
5: {id: "7", import_id: "1", original_filename: "", filename: "IMG_8113 - Version 2.jpg",…}
6: {id: "8", import_id: "1", original_filename: "", filename: "IMG_8009 - Version 2.jpg",…}
7: {id: "9", import_id: "1", original_filename: "", filename: "IMG_8109 - Version 2.jpg",…}
8: {id: "10", import_id: "1", original_filename: "", filename: "IMG_7967 - Version 2.jpg",…}
9: {id: "11", import_id: "1", original_filename: "", filename: "IMG_8004.jpg",…}

下面是我的测试代码：

$(function() {
        var photo_album = new PhotoCollection();
        photo_album.fetch({
            success: function (photo_album, response) {
                photo_album.each(function(photo, index, all) {
                    console.log(photo.get('filename'));
                });
            }
        );}
    };

当我查看控制台时，我看到同一个文件名重复了10次，这是我的照片模型（IMG_8199 - Version 2.jpg）的默认文件名。我希望看到10个不同的文件名，根据/api/Photo返回的数据（如上）。
有人能告诉我哪里出了问题吗？我觉得这一定是很明显的事情--这是我第一次尝试backbone.js。
如果我在集合的Parse方法中记录response_data.data，我会从json数据中看到正确的数据数组。
顺便说一句，我能够成功地加载个人照片模型没有任何问题。
任何帮助将不胜感激，谢谢！