将静态数据加载到Go语言中的嵌套结构中。

huangapple
go评论87阅读模式
英文:

loading static data into nested struct in Go

问题

我正在寻找实现类似于GoPlayground示例的东西：https://go.dev/play/p/B4JOVwgdwUk

然而，我的数据结构稍微复杂一些，其中有一个名为Tag的嵌套结构体。我无法正确地将数据加载到toFile变量声明中的结构体中。

有人可以帮助我找出我做错了什么吗？我尝试了下面显示的完整代码，以及这个：

Tags: []Tag{
    [{"appID:": "go", "category": "backend"},{"appID": "fiber", "category": "framework"}]
}

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "os"
)

func main() {

    type Stack struct {
        Reputation   int    `json:"reputation"`
        UserID       int    `json:"user_id"`
        UserType     string `json:"user_type"`
        ProfileImage string `json:"profile_image"`
        DisplayName  string `json:"display_name"`
        Link         string `json:"link"`
        Tags         []Tag  `json:"tags"`
    }
    type Tag struct {
        AppID    string `json: "appID:,omitempty"`
        Category string `json: "category:,omitempty"`
    }
    toFile := Stack{
        Reputation:   141,
        UserID:       9820773,
        UserType:     "registered",
        ProfileImage: "https://graph.facebook.com/10209865263541884/picture?type=large",
        DisplayName:  "Joe Smith",
        Link:         "https://stackoverflow.com/users/9820773/joe-smith",
        Tags: []Tag{
            {"appID:": "go", "category": "backend"},
            {"appID": "fiber", "category": "framework"}
        }, // 无法使其工作
    }

    // 写入文件！
    tmpFile, err := ioutil.TempFile(os.TempDir(), "sample-")
    if err != nil {
        panic(err)
    }
    defer os.Remove(tmpFile.Name())
    err = json.NewEncoder(tmpFile).Encode(toFile)
    if err != nil {
        panic(err)
    }
    err = tmpFile.Close()
    if err != nil {
        panic(err)
    }

    // 让我们读取它！
    tmpFile2, err := os.Open(tmpFile.Name())
    if err != nil {
        panic(err)
    }
    var fromFile Person
    err = json.NewDecoder(tmpFile2).Decode(&fromFile)
    if err != nil {
        panic(err)
    }
    err = tmpFile2.Close()
    if err != nil {
        panic(err)
    }
    fmt.Printf("%+v\n", fromFile)
}
英文:

I am looking to implement something very similar to this GoPlayground example:
https://go.dev/play/p/B4JOVwgdwUk

However my data structure is a bit more complex, with the nested struct called Tag. I can't quite get the syntax correct for how to load the data into the struct in the toFile variable declaration.

Can someone help me figure out what I am doing wrong? I have tried what is displayed in the full code below, as well as this:

Tags:        []Tag{
[{"appID:": "go", "category": "backend"},{"appID": "fiber", "category": "framework"}]
}

package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
)
func main() {
type Stack struct {
Reputation   int    `json:"reputation"`
UserID       int    `json:"user_id"`
UserType     string `json:"user_type"`
ProfileImage string `json:"profile_image"`
DisplayName  string `json:"display_name"`
Link         string `json:"link"`
Tags         []Tag  `json:"tags"`
}
type Tag struct {
AppID			string `json: "appID:,omitempty"`
Category	string  `json: "category:,omitempty"`
}
toFile := Stack{
Reputation:   141,
UserID:       9820773,
UserType:     "registered",
ProfileImage: "https://graph.facebook.com/10209865263541884/picture?type=large",
DisplayName:  "Joe Smith",
Link:         "https://stackoverflow.com/users/9820773/joe-smith",
Tags:        Tag{
[{"appID:": "go", "category": "backend"},{"appID": "fiber", "category": "framework"}] 
} // cannot get this to work
}
// Write it out!
tmpFile, err := ioutil.TempFile(os.TempDir(), "sample-")
if err != nil {
panic(err)
}
defer os.Remove(tmpFile.Name())
err = json.NewEncoder(tmpFile).Encode(toFile)
if err != nil {
panic(err)
}
err = tmpFile.Close()
if err != nil {
panic(err)
}
// Let's read it in!
tmpFile2, err := os.Open(tmpFile.Name())
if err != nil {
panic(err)
}
var fromFile Person
err = json.NewDecoder(tmpFile2).Decode(&fromFile)
if err != nil {
panic(err)
}
err = tmpFile2.Close()
if err != nil {
panic(err)
}
fmt.Printf("%+v\n", fromFile)
}

答案1

得分: 1

@Kousik的评论帮助我修复了代码，并成功在GoPlayground上运行了它：

https://go.dev/play/p/WmZ9m_55W3S

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"
)

func main() {

	type Tag struct {
		AppID    string `json:"appID,omitempty"`
		Category string `json:"category,omitempty"`
	}

	type Stack struct {
		Reputation   int    `json:"reputation"`
		UserID       int    `json:"user_id"`
		UserType     string `json:"user_type"`
		ProfileImage string `json:"profile_image"`
		DisplayName  string `json:"display_name"`
		Link         string `json:"link"`
		Tags         []Tag  `json:"tags"`
	}

	toFile := Stack{
		Reputation:   141,
		UserID:       9820773,
		UserType:     "registered",
		ProfileImage: "https://graph.facebook.com/10209865263541884/picture?type=large",
		DisplayName:  "Joe Smith",
		Link:         "https://stackoverflow.com/users/9820773/joe-smith",
		Tags:         []Tag{{AppID: "id1", Category: "cat1"}, {AppID: "id2", Category: "cat2"}},
	}

	// 写入文件！
	tmpFile, err := ioutil.TempFile(os.TempDir(), "sample-")
	if err != nil {
		panic(err)
	}
	defer os.Remove(tmpFile.Name())
	err = json.NewEncoder(tmpFile).Encode(toFile)
	if err != nil {
		panic(err)
	}
	err = tmpFile.Close()
	if err != nil {
		panic(err)
	}

	// 让我们读取它！
	tmpFile2, err := os.Open(tmpFile.Name())
	if err != nil {
		panic(err)
	}
	var fromFile Stack
	err = json.NewDecoder(tmpFile2).Decode(&fromFile)
	if err != nil {
		panic(err)
	}
	err = tmpFile2.Close()
	if err != nil {
		panic(err)
	}
	fmt.Printf("%+v\n", fromFile)
}
英文:

The comment from @Kousik helped me fix up the code and run it successfully on the GoPlayground:
https://go.dev/play/p/WmZ9m_55W3S

package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
)
func main() {
type Tag struct {
AppID    string `json: "appID:,omitempty"`
Category string `json: "category:,omitempty"`
}
type Stack struct {
Reputation   int    `json:"reputation"`
UserID       int    `json:"user_id"`
UserType     string `json:"user_type"`
ProfileImage string `json:"profile_image"`
DisplayName  string `json:"display_name"`
Link         string `json:"link"`
Tags         []Tag  `json:"tags"`
}
toFile := Stack{
Reputation:   141,
UserID:       9820773,
UserType:     "registered",
ProfileImage: "https://graph.facebook.com/10209865263541884/picture?type=large",
DisplayName:  "Joe Smith",
Link:         "https://stackoverflow.com/users/9820773/joe-smith",
Tags:         []Tag{{AppID: "id1", Category: "cat1"}, {AppID: "id2", Category: "cat2"}},
}
// Write it out!
tmpFile, err := ioutil.TempFile(os.TempDir(), "sample-")
if err != nil {
panic(err)
}
defer os.Remove(tmpFile.Name())
err = json.NewEncoder(tmpFile).Encode(toFile)
if err != nil {
panic(err)
}
err = tmpFile.Close()
if err != nil {
panic(err)
}
// Let's read it in!
tmpFile2, err := os.Open(tmpFile.Name())
if err != nil {
panic(err)
}
var fromFile Stack
err = json.NewDecoder(tmpFile2).Decode(&fromFile)
if err != nil {
panic(err)
}
err = tmpFile2.Close()
if err != nil {
panic(err)
}
fmt.Printf("%+v\n", fromFile)
}

huangapple
  • 本文由 发表于 2023年1月29日 03:15:21
  • 转载请务必保留本文链接：https://go.coder-hub.com/75270204.html
  • go
  • json
  • struct
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