绑定将类对象数组传递到html时出现问题

问题详细信息

当我尝试用html写下一行时,它会说:

category_id是结构类型Categories的未导出字段。category

<option value="eded">{{ $element.category_id }}</option>

但是当我尝试这个的时候 <option value="eded">{{ $element }}</option> 我得到以下结果。因此,我可以在html中确认数据传输成功

类别处理程序代码

type PageProps struct {
    Categories []Category
}

type Category struct {
    category_id int
}

type CategorydHandler struct {
    PageData PageProps
}

func Instantiate(pageProps PageProps) *CategorydHandler {
    return &CategorydHandler{
        PageData: pageProps,
    }
}

func (pageData *CategorydHandler) GetCategories() []Category {
    query := "select * from tblcategory order by category_id"
    result, err := db.Query(query)
    for result.Next() {
        var objCategory Category
        result.Scan(&objCategory.category_id)
        pageData.PageData.Categories = append(pageData.PageData.Categories, objCategory)
    }
    return pageData.PageData.Categories
}

main.go

categories := objCategories.GetCategories()

html代码

<select multiple type="text">
    {{ range $index, $element := .Categories }}
        <option value="eded">{{ $element }}</option>
    {{ end }}        
</select>