无法将字符串解组到类型模型的Go struct字段Article.article_type中. [英] cannot unmarshal string into Go struct field Article.article_type of type models.ArticleType

问题描述

我无法将json字段 article_type 编组为golang结构 Article .

I cannot unmarshal json field article_type into golang struct Article.

我遇到错误:

json:无法将字符串解组到类型模型的Go struct字段Article.article_type中.ArticleType

str := []byte(`[{"created_at":1486579331,"updated_at":1486579331,"article_type":"news"}]`)

type Article struct {
    ID            uint      `gorm:"primary_key"`
    CreatedAt     timestamp.Timestamp `json:"created_at"`
    UpdatedAt     timestamp.Timestamp `json:"updated_at"`

    ArticleType   ArticleType `json:"article_type"`
    ArticleTypeId uint        `gorm:"index" json:"-"`

type ArticleType struct {
    ID        uint      `gorm:"primary_key" json:"id"`
    CreatedAt timestamp.Timestamp `json:"created_at"`
    UpdatedAt timestamp.Timestamp `json:"updated_at"`
    Title     string    `gorm:"size:255" json:"title"`

    Articles  []Article `json:"articles"`
}

articles := []models.Article{}
if err := json.Unmarshal(str, &articles); err != nil {
    panic(err)
}

我希望将"article_type":新闻" 解析为:Article.ArticleType.title =新闻"然后，我可以将具有标题为新闻"的文章类型的文章对象保存在数据库中.

I wanted that "article_type":"news" would be parse as: Article.ArticleType.title = "news" And then I would can save article object which have article type with title "news" in database.

推荐答案

您可以让您的 ArticleType 实现

You can have your ArticleType implement the json.Unmarshaler interface by defining an UnmarshalJSON method on it:

func (a *ArticleType) UnmarshalJSON(b []byte) error {
    a.Title = string(b)
    return nil
}

https://play.golang.org/p/k_UlghLxZI

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