sample binding in Gin

sample-gin-binding.go

package main

import (
    "fmt"
    "net/http"

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

type AddressTypeAttr struct {
    PostalCode  string `json:"postalCode"  binding:"required"`
    HouseNumber uint16 `json:"houseNumber" binding:"required"`
}

type PersonTypeAddr struct {
    ID string `json:"id" binding:"required"`
}

type Body struct {
    ActionType string          `json:"actionType"        binding:"required"`
    Person     PersonTypeAddr  `json:"person,omitempty"  binding:"required_without=Address"`
    Address    AddressTypeAttr `json:"address,omitempty" binding:"required_without=Person"`
}

func main() {
    r := gin.Default()
    r.POST("/", func(ctx *gin.Context) {
        b := Body{}
        if err := ctx.BindJSON(&b); err != nil {
            ctx.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("invalid request body: %s", err)})
        } else {
            ctx.JSON(http.StatusOK, gin.H{"data": "We got that!"})
        }
    })
    r.Run()
}