我试图通过imagekit sdk将图片从我的Golang后端上传到imagekit。我面临着理解上下文API用于什么的问题。
目前，我并没有真正在后端使用上下文，也没有在构造函数中传递所有依赖项。
我遇到了一个异常：

2023/01/04 09:53:56 http: panic serving 127.0.0.1:50780: runtime error: invalid memory address or nil pointer dereference
goroutine 20 [running]:
net/http.(*conn).serve.func1()
        /usr/local/Cellar/go/1.19.3/libexec/src/net/http/server.go:1850 +0xbf
panic({0x1005836c0, 0x10092b820})
        /usr/local/Cellar/go/1.19.3/libexec/src/runtime/panic.go:890 +0x262
github.com/bolzfieber/bolzfieber-backend/internal/controllers.PitchesController.CreateAndUpdatePitch({0xc0001f7530?, 0x0?}, {0x1006a94e8, 0xc0000ca000}, 0xc0000d4000)
        /Users/pbahr/DEV/Bolzfieber/BE/bolzfieber-backend/internal/controllers/pitches.go:91 +0x5ae
net/http.HandlerFunc.ServeHTTP(0x100580980?, {0x1006a94e8?, 0xc0000ca000?}, 0xc0000be048?)
        /usr/local/Cellar/go/1.19.3/libexec/src/net/http/server.go:2109 +0x2f
github.com/go-chi/chi/v5.(*Mux).routeHTTP(0xc00007c600, {0x1006a94e8, 0xc0000ca000}, 0xc0000d4000)
        /Users/pbahr/go/pkg/mod/github.com/go-chi/chi/v5@v5.0.7/mux.go:442 +0x216
net/http.HandlerFunc.ServeHTTP(0xc0000b00c0?, {0x1006a94e8?, 0xc0000ca000?}, 0xc00011b918?)
        /usr/local/Cellar/go/1.19.3/libexec/src/net/http/server.go:2109 +0x2f
github.com/go-chi/chi/v5.(*Mux).ServeHTTP(0xc00007c600, {0x1006a94e8, 0xc0000ca000}, 0xc0000d4000)
        /Users/pbahr/go/pkg/mod/github.com/go-chi/chi/v5@v5.0.7/mux.go:71 +0x355
github.com/go-chi/chi/v5.(*Mux).Mount.func1({0x1006a94e8, 0xc0000ca000}, 0xc0000d4000)
        /Users/pbahr/go/pkg/mod/github.com/go-chi/chi/v5@v5.0.7/mux.go:314 +0x19c
net/http.HandlerFunc.ServeHTTP(0x100580980?, {0x1006a94e8?, 0xc0000ca000?}, 0xc0000aa005?)
        /usr/local/Cellar/go/1.19.3/libexec/src/net/http/server.go:2109 +0x2f
github.com/go-chi/chi/v5.(*Mux).routeHTTP(0xc00007c420, {0x1006a94e8, 0xc0000ca000}, 0xc0000d4000)
        /Users/pbahr/go/pkg/mod/github.com/go-chi/chi/v5@v5.0.7/mux.go:442 +0x216
net/http.HandlerFunc.ServeHTTP(0x1006a9bf8?, {0x1006a94e8?, 0xc0000ca000?}, 0x10092b640?)
        /usr/local/Cellar/go/1.19.3/libexec/src/net/http/server.go:2109 +0x2f
github.com/go-chi/chi/v5.(*Mux).ServeHTTP(0xc00007c420, {0x1006a94e8, 0xc0000ca000}, 0xc000332000)
        /Users/pbahr/go/pkg/mod/github.com/go-chi/chi/v5@v5.0.7/mux.go:88 +0x310
net/http.serverHandler.ServeHTTP({0x1006a84d0?}, {0x1006a94e8, 0xc0000ca000}, 0xc000332000)
        /usr/local/Cellar/go/1.19.3/libexec/src/net/http/server.go:2947 +0x30c
net/http.(*conn).serve(0xc00032c000, {0x1006a9ca0, 0xc000318270})
        /usr/local/Cellar/go/1.19.3/libexec/src/net/http/server.go:1991 +0x607
created by net/http.(*Server).Serve
        /usr/local/Cellar/go/1.19.3/libexec/src/net/http/server.go:3102 +0x4db

而第91行是imagekit的upload行，所以我假设null指针是上下文。
我目前的方法如下所示：

func (c PitchesController) CreateAndUpdatePitch(w http.ResponseWriter, r *http.Request) {
    var pitchUpload models.PitchUpload
    err := json.NewDecoder(r.Body).Decode(&pitchUpload)

    if err != nil {
        fmt.Printf("Error: %v\n", err)
        utils.RespondWithError(w, http.StatusBadRequest, "Bad request")
        return
    }

    var pitch = models.Pitch{
        Name:            pitchUpload.Name,
        Address:         pitchUpload.Address,
        Author:          pitchUpload.Author,
        PitchType:       pitchUpload.PitchType,
        PitchSize:       pitchUpload.PitchSize,
        GoalSize:        pitchUpload.GoalSize,
        GoalType:        pitchUpload.GoalType,
        LocationScopeId: pitchUpload.LocationScopeId,
        Coordinates:     pitchUpload.Coordinates,
        Rating:          pitchUpload.Rating,
    }

    for i, image := range pitchUpload.Images {
        fmt.Printf("pitch: %v\n", pitchUpload.Name)
        response, uploadErr := c.Ik.Uploader.Upload(r.Context(), image, uploader.UploadParam{
            FileName:          pitchUpload.Name + "_" + string(rune(i)),
            UseUniqueFileName: newTrue(),
            Tags:              "pitch",
            Folder:            "/pitches/" + pitchUpload.Name,
        })

        if uploadErr != nil {
            fmt.Printf("Error: %v\n", uploadErr)
            utils.RespondWithError(w, http.StatusBadRequest, "Bad request")
            return
        }

        pitch.Images = append(pitch.Images, models.PitchImage{FileUrl: response.Data.Url})
    }

    c.Db.Save(&pitch)

    utils.RespondWithJSON(w, http.StatusCreated, "Created successfully")
}

以下步骤适用：
1.接收post主体并解码为有效的go结构
1.创建稍后应保存到db的新结构
1.循环遍历结构的图像（base64字符串）
1.对于上传到imagekit的每个图像
1.将imagekit响应附加到应该保存到数据库的结构
1.保存到数据库