Some summary of gin binding form data and structure encounter pits

前言

最近在公司做某个项目的时候遇到了gin绑定表单数据与结构体的一些问题，困扰了挺久的，终于解决了，在此记录一下。

坑1 绑定表单字符串数组与结构体

form.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/" method="POST">
    <p>Check some colors</p>
    <label for="red">Red</label>
    <input type="checkbox" name="colors[]" value="red" id="red" /><br/>
    <label for="green">Green</label>
    <input type="checkbox" name="colors[]" value="green" id="green" /><br/>
    <label for="blue">Blue</label>
    <input type="checkbox" name="colors[]" value="blue" id="blue" /><br/>

    <label for="Student">Name:</label>
    <input type="text" name="name" /><br/>

    <label for="Student">Age:</label>
    <input type="text" name="age" /><br />

    <input type="submit" />
</form>
</body>
</html>

main.go

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
)

type Student struct {
	Name  string `form:"name"`
	Age   int    `form:"age"`
}

type myForm struct {
	Colors 		[]string	`form:"colors[]"`
	Students 	Student
}

func main() {
	r := gin.Default()
	r.LoadHTMLGlob("views/*")
	r.GET("/", indexHandler)
	r.POST("/", formHandler)
	r.Run(":10000")
}

func indexHandler(c *gin.Context) {
	c.HTML(200, "form.html", nil)
}

func formHandler(c *gin.Context) {
	var fakeForm myForm
	c.Bind(&fakeForm)
	c.JSON(200, gin.H{
		"color": fakeForm.Colors,
		"students" : fakeForm.Students,
	})
	fmt.Println(fakeForm)
}

提交后的效果如下图，这里还是比较简单的。

坑2 绑定表单结构体数组

main.go

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"net/http"
)

type Student struct {
	Name  string `json:"name"`
	Age   int    `json:"age"`
}

type myForm struct {
	Students 	[]Student `json:"students"`
}

func main() {
	r := gin.Default()
	r.LoadHTMLGlob("views/*")
	r.GET("/", indexHandler)
	r.POST("/test", formHandler)
	r.Run(":10000")
}

func indexHandler(c *gin.Context) {
	c.HTML(200, "form.html", nil)
}

func formHandler(c *gin.Context) {
	var fakeForm myForm

	if err := c.BindJSON(&fakeForm); err != nil {
		//log.Fatal(err)
		return
	}
	fmt.Println(fakeForm.Students)
	c.JSON(http.StatusOK, fakeForm)

	fmt.Println(fakeForm)
}

传入json即可

Reference

go binding如何绑定结构体数组

Question: How bind JSON array