type PostView struct {
    Id                      int64           `json:"userid"`
    PostId                  int64           `json:"postId"`
    Title                   string          `json:"Title"`
    Content                 string          `json:"Content"`
    Comment                 string          `json:"comment"`
    CreatedAt               *time.Time      `json:"createdAt"`
    UpdatedAt               *time.Time      `json:"updatedAt"`
}

type PostRequestBody struct {
    Title           string
    Content         string
    Comment         string
}

func (p *PostRequestBody) FieldMap(req *http.Request) binding.FieldMap {
return binding.FieldMap{
    &p.Title:           "Title",
    &p.Content:         "Content",
    &p.Comment:         "Comment",

}

func UpdatePost(w http.ResponseWriter, req *http.Request, ps httprouter.Params) {
    userId, err := strconv.ParseInt(ps.ByName("userId"), 10, 0)
    helpers.CheckErr(err, "Invalid userId")

    postId, err := strconv.ParseInt(ps.ByName("postId"), 10, 0)
    helpers.CheckErr(err, "Invalid postId")

    user := models.Getuser(userId)
    log.Println(user)

    switch user.GroupId {
    case 1://日記

        p := models.GetPost(postId)//指定したidのpostがストラクトで返ってくる

//p := new(models.PostRequestBody)//新しい投稿を作ることができる

        errs := binding.Bind(req, p)//エラーが起きるアサインメントできないから
        if errs.Len() > 0 {
            log.Println(errs)
            R.JSON(w, 422, errs)
            return
        }

        post := models.Post{
            Title: p.title,
            Content: p.content,
            Comment: p.comment,
        }


        log.Println("log:",post)
        R.JSON(w, http.StatusOK, models.UpdatePost(post))
    default:
        R.JSON(w, http.StatusBadRequest, map[string]interface{}{
            "code":    http.StatusBadRequest,
            "message": http.StatusText(http.StatusBadRequest),
        })

    }
}