Gin ShouldBindJSON method any way to auto convert type problem?

Is there anyway to auto convert base type? such as string to int64 int32... in fact, this problem easy implemently?

Comment From: zihengCat

@ChannelCook The implementation of ShouldBindJSON is handled by standard library encoding/json (or compatible third party jsoniter if user enabled it), so the behavior is the same as standard library.

Comment From: zihengCat

@ChannelCook

I give you a quick example here. You can see Count field is auto converted from string to int handled by standard library.

Example Code Snippet

package main

import (
    "fmt"
    "net/http"

    "github.com/gin-gonic/gin"
)

// Binding from JSON
type Product struct {
    Name  string `json:"name"`
    Count int    `json:"count,string"` // auto convert from string to int
}

func main() {
    router := gin.Default()
    router.POST("/product", func(c *gin.Context) {
        var p Product
        if err := c.ShouldBindJSON(&p); err != nil {
            c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
            return
        }
        fmt.Println("Name:", p.Name)
        fmt.Println("Count:", p.Count) // already converted
        c.JSON(http.StatusOK, gin.H{"message": "Ok"})
    })
    router.Run(":8080")
}

Test Scripts

curl -X POST -v \
  --header "Content-Type: application/json" \
  --data '{"name": "abc", "count": "123"}' \
  http://localhost:8080/product

Result

[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env:   export GIN_MODE=release
 - using code:  gin.SetMode(gin.ReleaseMode)

[GIN-debug] POST   /product                  --> main.main.func1 (3 handlers)
[GIN-debug] Listening and serving HTTP on :8080
Name: abc
Count: 123
[GIN] 2021/07/14 - 11:58:09 | 200 |     267.736µs |             ::1 | POST     "/product"

Comment From: ChannelCook

Great!!!

Comment From: timsegraves

You just saved me hours. Been fighting this for a while now.