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Articles hosted on my blog

Home Page: https://blog.depado.eu

License: MIT License

Go 92.09% Makefile 1.13% Dockerfile 2.44% HTML 4.33%

articles ci-cd golang stuff

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Rendering the TOC with Blackfriday

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Dialogflow Webhook, Golang and Protobuf

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Small Example : How to use the scrape library in Go

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Interesting Projects

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QOR Admin Tutorial

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Cheap Open-Source Stack

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Smallblog Cheatsheet

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CI/CD with Drone, Kubernetes and Helm - Part 3

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Scaffold a Flask Project

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Smallblog Documentation

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Buffer-less Multipart POST in Golang

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CI/CD with Drone, Kubernetes and Helm - Part 1

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Checklist for Go projects

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DialogFlow : A complete guide with webhook

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gin-validation for an array of struct

Hi @Depado ,
Greetings, I saw your blog for gin-validation and it helped in my use case.
But I am unable to use it if the validation is done on an array of struct.

My sample code

package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"reflect"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/gin-gonic/gin/binding"
	"github.com/go-playground/validator/v10"
)

type User struct {
	Email string `json:"email" form:"e-mail" binding:"required"`
	Name  string `json:"name" binding:"required"`
}

func main() {
	route := gin.Default()
	if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
		v.RegisterTagNameFunc(func(fld reflect.StructField) string {
			name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
			if name == "-" {
				return ""
			}
			return name
		})
	}
	route.POST("/user", validateUser)
	route.Run(":8085")
}
func validateUser(c *gin.Context) {
	var u []User
	if err := c.ShouldBindJSON(&u); err == nil {
		c.JSON(http.StatusOK, gin.H{"message": "User validation successful."})
	} else {
		fmt.Println(err)
		var verr validator.ValidationErrors
		var jsErr *json.UnmarshalTypeError

		if errors.As(err, &verr) {
			c.JSON(http.StatusBadRequest, gin.H{"errors": Descriptive(verr)})
			return
		} else if errors.As(err, &jsErr) {
			c.JSON(http.StatusBadRequest, gin.H{"errors": MarshalErr(*jsErr)})
			return
		}
	}
}

func Simple(verr validator.ValidationErrors) map[string]string {
	errs := make(map[string]string)
	for _, f := range verr {
		err := f.ActualTag()

		if f.Param() != "" {
			err = fmt.Sprintf("%s=%s", err, f.Param())
		}
		errs[f.Field()] = err + "," + f.Kind().String()
		fmt.Println(errs)
	}
	return errs

}

type ValidationError struct {
	Field  string `json:"field"`
	Type   string `json:"type"`
	Reason string `json:"reason"`
}
func MarshalErr(jsErr json.UnmarshalTypeError) ValidationError {
	errs := ValidationError{}
	errs.Field=jsErr.Field
	errs.Reason="invalid type"
	errs.Type=jsErr.Type.String()
	return errs
}
func Descriptive(verr validator.ValidationErrors) []ValidationError {
	errs := []ValidationError{}

	for _, f := range verr {
		fmt.Println(f)
		err := f.ActualTag()
		if f.Param() != "" {
			err = fmt.Sprintf("%s=%s", err, f.Param())
		}
		errs = append(errs, ValidationError{Field: f.Field(), Reason: err, Type: f.Type().Name()})
	}

	return errs
}

Test Input

curl --location --request POST 'http://localhost:8085/user' \
--header 'content-type: application/json' \
--data-raw '[
    {
        "email": "[email protected]",
        "name": "Me"
    },
    {
        "email": "[email protected]"
    }
]'

Expected output

"errors": [
        {
            "field": "name",
            "type": "string",
            "reason": "required"
        }
    ]

Can you please help me with it.

Smallblog Update & Capabilities

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Writing a markov-chain IRC bot in Go

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Some Go snippets I find useful

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Setting up Caddy Server on Debian

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Copy files and directories in Go

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Play a distant audio stream using Go and Gstreamer

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Execute a function periodically using a wrapper in Python

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Cheap Open-Source Stack

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Small and secure Docker images for Go

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Gin Validation Errors Handling

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First Article

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Dining Philosophers : Rust vs Go

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Mistune Syntax Highlighter, MathJax support and centered images

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Gorm Gotchas

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DialogFlow : A complete guide

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Embedding resources with rice.go in a Gin project

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Cuite Playlists

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about your GO program checklist

Hi,

viper can be replaced by the simplest github.com/namsral/flag if you don't need a config file (config files are evil, see 12 factors)
dep is "deprecated", use modules
cobra have a strong application layout which makes your go code far less readable
you forgot to add metrics (using the prometheus endpoint and github.com/prometheus/client_golang/prometheus). This is useful if your application is not a commandline tool
you forgot to add tracing, which can also be helpful if it's not a commandline. Opentracing, Jaeger, Zipkin... or Opencensu which offer all of the above plus many other things

I would have commented on the blog directly, but your oauth tool against Github is requesting read and write to all my public repos, which is not going to happen.

How to do gin-validation for an array of struct