我正在努力学习 Go 的基础知识。

我正在尝试在 golang 中呈现一个模板，其中包含结构的预填充值。但是没有运气

func ServeIndex(w http.ResponseWriter, r *http.Request) {
    p := &Page{
        Title:   " Go Project CMS",
        Content: "Welcome to our home page",
        Posts: []*Post{
            &Post{
                Title:         "Hello World",
                Content:       "Hello, World Thanks for coming to this site",
                DatePublished: time.Now(),
            },
            &Post{
                Title:         "A Post with comments",
                Content:       "Here is the controversial post",
                DatePublished: time.Now(),
                Comments: []*Comment{
                    &Comment{
                        Author:        "Sathish",
                        Comment:       "Nevermind, I guess",
                        DatePublished: time.Now().Add(-time.Hour / 2),
                    },
                },
            },
        },
    }

    Tmpl.ExecuteTemplate(w, "page", p)
}

这是我的结构定义

import (
    "html/template"
    "time"
)

// Tmpl is exported and can be used by other packages
var Tmpl = template.Must(template.ParseGlob("../templates/*"))

type Page struct {
    Title   string
    Content string
    Posts   *[]Post
}

type Post struct {
    Title         string
    Content       string
    DatePublished time.Time
    Comments      *[]Comment
}

type Comment struct {
    Author        string
    Comment       string
    DatePublished time.Time
}

当我尝试通过 main.go 文件运行此代码时，出现以下错误

../handler.go:60: cannot use []*Comment literal (type []*Comment) as type *[]Comment in field value
../handler.go:62: cannot use []*Post literal (type []*Post) as type *[]Post in field value

你能帮我理解真正的问题是什么吗？我正在观看视频教程。

编辑:根据 mktopriva 建议更新了代码

func ServeIndex(w http.ResponseWriter, r *http.Request) {
    p := &Page{
        Title:   " Go Project CMS",
        Content: "Welcome to our home page",
        Posts: *[]Post{
            &Post{
                Title:         "Hello World",
                Content:       "Hello, World Thanks for coming to this site",
                DatePublished: time.Now(),
            },
            &Post{
                Title:         "A Post with comments",
                Content:       "Here is the controversial post",
                DatePublished: time.Now(),
                Comments: *[]Comment{
                    &Comment{
                        Author:        "Sathish",
                        Comment:       "Nevermind, I guess",
                        DatePublished: time.Now().Add(-time.Hour / 2),
                    },
                },
            },
        },
    }

    Tmpl.ExecuteTemplate(w, "page", p)
}

出现以下错误

../handler.go:45: cannot use Post literal (type *Post) as type Post in array or slice literal
../handler.go:50: cannot use *Post literal (type *Post) as type Post in array or slice literal
../handler.go:55: cannot use Comment literal (type *Comment) as type Comment in array or slice literal
../handler.go:60: invalid indirect of []Comment literal (type []Comment)
../handler.go:62: invalid indirect of []Post literal (type []Post)

最佳答案

@mkopriva 是正确的，但我猜这不是你想要的......

您的结构声明略有偏差，例如，Page 有一个指向 Post 值 slice 的指针，您可能想要一个 Post 指针 slice ，因为那样会通常人们如何使用 slice 。您的声明只需要将 * 放在类型旁边，而不是 [] 然后您的创建代码就可以工作了。

import (
    "html/template"
    "time"
)

// Tmpl is exported and can be used by other packages
var Tmpl = template.Must(template.ParseGlob("../templates/*"))

type Page struct {
    Title   string
    Content string
    Posts   []*Post
}

type Post struct {
    Title         string
    Content       string
    DatePublished time.Time
    Comments      []*Comment
}

type Comment struct {
    Author        string
    Comment       string
    DatePublished time.Time
}

关于go - 填充包含 slice 的结构，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51916592/