我目前正在使用GoFiber V2创建一个golang API。
我在Mongo数据库中有一个音乐曲目的文档结构如下：

{
    "_id" : ObjectId("63cc26cb86ae1611380e1206"),
    "active" : 1,
    "exclusive" : "false",
    "track_title" : "Burn Slow (sting)",
    "artist_id" : "395",
    "artist_name" : "David Hollandsworth",
    "album_title" : "Cult Justice 23",
    "composer" : "David Hollandsworth",
    "duration" : "00:16",
    "publisher" : "FlikTrax, LLC",
    "description" : "T.V. drama, rural tension, apprehension. Style: \"Hell on Wheels\" soundtrack.",
    "url_path" : "davidhollandsworth/cultjustice23/burn-slow-sting.wav",
    "vocal_type" : "instrumental",
    "beats_per_minute" : "80",
    "file_path_compressed" : "davidhollandsworth/cultjustice23/burn-slow-sting.mp3",
    "file_path_uncompressed" : "davidhollandsworth/cultjustice23/burn-slow-sting.wav",

    "genres" : [ 
        "Tension", 
        "Americana", 
        "Tv Drama"
    ],
    "genres_keys" : [ 
        "tension", 
        "americana", 
        "tv drama"
    ],
    "moods" : [ 
        "tension", 
        "bluesy", 
        "spacey"
    ],
    "styles" : [ 
        "tv drama", 
        "unsolved mystery", 
        "western"
    ],
    "instruments" : [ 
        "dobro", 
        "banjo", 
        "percussion"
    ],
    "keywords" : [ 
        "rural-tension", 
        " showdown", 
        " apprehension", 
        " uncertainty", 
        " light-tension", 
        " strings-tension", 
        " heartland", 
        " trouble", 
        " uneasy", 
        " cautious", 
        " outlaw", 
        " yellowstone", 
        " bayou", 
        " gritty", 
        " swampy", 
        " swamp-people", 
        " southern", 
        " uncertain", 
        " drama", 
        " apprehension", 
        " bluesy", 
        " blues", 
        " shack", 
        " poor-folk", 
        " primitive"
    ],
    "sounds_like" : [ 
        "Brian Tyler", 
        "Max Richter", 
        "T.V. Drama"
    ],
    "resembles_song" : [ 
        "Hell on Wheels", 
        "Yellowstone", 
        "Rural/Outlaw/Tension"
    ],
    "last_modified" : 1674323659,
    "variation_count" : 5,
    "variations" : {
        "_id" : ObjectId("63cc26bc86ae1611380e1200"),
        "track_title" : "Burn Slow",
        "artist_name" : "David Hollandsworth",
        "master_track_id" : "63cc26bc86ae1611380e1200",
        "master_track" : ObjectId("63cc26bc86ae1611380e1200"),
        "merged" : 1,
        "variation_count" : 5,
        "variations" : {
            "63cc26bc86ae1611380e1200" : {
                "track_id" : "63cc26bc86ae1611380e1200",
                "track_title" : "Burn Slow",
                "artist_name" : "David Hollandsworth"
            },
            "63cc26c086ae1611380e1203" : {
                "track_id" : "63cc26c086ae1611380e1203",
                "track_title" : "Burn Slow (bed mix)",
                "artist_name" : "David Hollandsworth"
            },
            "63cc26c386ae1611380e1204" : {
                "track_id" : "63cc26c386ae1611380e1204",
                "track_title" : "Burn Slow (cutdown)",
                "artist_name" : "David Hollandsworth"
            },
            "63cc26c786ae1611380e1205" : {
                "track_id" : "63cc26c786ae1611380e1205",
                "track_title" : "Burn Slow (lows and perc)",
                "artist_name" : "David Hollandsworth"
            },
            "63cc26cb86ae1611380e1206" : {
                "track_id" : "63cc26cb86ae1611380e1206",
                "track_title" : "Burn Slow (sting)",
                "artist_name" : "David Hollandsworth"
            }
        }
    }
}

目前，我在Golang模型中有以下轨道结构：

type Track struct {
    ID                   primitive.ObjectID `bson:"_id, omitempty" json:"_id"`
    TrackTitle           string             `bson:"track_title" json:"track_title"`
    ArtistId             string             `bson:"artist_id" json:"artist_id"`
    ArtistName           string             `bson:"artist_name" json:"artist_name"`
    AlbumTitle           string             `bson:"album_title" json:"album_title"`
    Composer             string             `bson:"composer" json:"composer"`
    Publisher            string             `bson:"publisher" json:"publisher"`
    Description          string             `bson:"description" json:"description"`
    Duration             string             `bson:"duration" json:"duration"`
    UrlPath              string             `bson:"url_path" json:"url_path"`
    VocalType            string             `bson:"vocal_type" json:"vocal_type"`
    BeatsPerMinute       string             `bson:"beats_per_minute" json:"beats_per_minute"`
    FilePathCompressed   string             `bson:"file_path_compressed" json:"bfile_path_compressed"`
    FilePathUncompressed string             `bson:"file_path_uncompressed" json:"file_path_uncompressed"`
    PreviewURL           string             `bson:"preview_url" json:"preview_url"`
    Genres               []interface{}      `bson:"genres" json:"genres"`
    GenresKeys           []interface{}      `bson:"genres_keys" json:"genres_keys"`
    Moods                []interface{}      `bson:"moods" json:"moods"`
    Styles               []interface{}      `bson:"styles" json:"styles"`
    Instruments          []interface{}      `bson:"instruments" json:"instruments"`
    Keywords             []interface{}      `bson:"keywords" json:"keywords"`
    SoundsLike           []interface{}      `bson:"sounds_like" json:"sounds_like"`
    ResemblesSong        []interface{}      `bson:"resembles_song" json:"resembles_song"`
    LastModified         int                `bson:"last_modified" json:"last_modified"`
    VariationCount       int                `bson:"variation_count" json:"variation_count"`
}

目前所有的文档字段都被正确地解码为JSON，但是我现在陷入了一个僵局，那就是如何构造嵌入的“variations.variations”字段（注意，在variations中有variations）。嵌入的variations的结构是一个没有键的对象，而是一个动态的mongo ID字符串。
我尝试过实现一个自定义的结构和接口类型，但没有效果。
如果任何人以前遇到过这个问题，任何帮助都将不胜感激。