用於嵌套對象的 Golang 結構

Question

我目前正在使用 GoFiber V2 創建一個 golang api。

我在 Mongo 數據庫中有以下音樂曲目的文檔結構：

{
    "_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"
            }
        }
    }
}

目前我的 Golang model 中有以下軌道結構：

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"`
}

目前所有文檔字段都被正確解碼為 JSON，但是我現在在如何構建嵌入式“variations.variations”字段方面陷入僵局（請注意，變化中存在變化）。 嵌入式變體的結構是一個沒有密鑰的 object，而是一個動態的 mongo ID 字符串。

我嘗試過實現自定義結構和接口類型，但無濟於事。

如果有人以前遇到過這個問題，我們將不勝感激。

Answer 1

我建議盡可能避免使用interface{} （或any ），使用具體類型。 例如genres是一個字符串數組，在 Go 中使用[]string 。

對於variations.variations字段，您可以使用帶有string鍵和描述其元素的結構類型的map 。

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               []string           `bson:"genres" json:"genres"`
    GenresKeys           []string           `bson:"genres_keys" json:"genres_keys"`
    Moods                []string           `bson:"moods" json:"moods"`
    Styles               []string           `bson:"styles" json:"styles"`
    Instruments          []string           `bson:"instruments" json:"instruments"`
    Keywords             []string           `bson:"keywords" json:"keywords"`
    SoundsLike           []string           `bson:"sounds_like" json:"sounds_like"`
    ResemblesSong        []string           `bson:"resembles_song" json:"resembles_song"`
    LastModified         int                `bson:"last_modified" json:"last_modified"`
    VariationCount       int                `bson:"variation_count" json:"variation_count"`
    Variations           Variations         `bson:"variations" json:"variations"`
}

type Variations struct {
    ID             primitive.ObjectID   `bson:"_id" json:"_id"`
    TrackTitle     string               `bson:"track_title" json:"track_title"`
    ArtistName     string               `bson:"artist_name" json:"artist_name"`
    MasterTrackID  string               `bson:"master_track_id" json:"master_track_id"`
    MasterTrack    primitive.ObjectID   `bson:"master_track" json:"master_track"`
    Merged         int                  `bson:"merged" json:"merged"`
    VariationCount int                  `bson:"variation_count" json:"variation_count"`
    Variations     map[string]Variation `bson:"variations" json:"variations"`
}

type Variation struct {
    TrackID    string `bson:"track_id" json:"track_id"`
    TrackTitle string `bson:"track_title" json:"track_title"`
    ArtistName string `bson:"artist_name" json:"artist_name"`
}