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Home Page: https://blog.depa.do
License: MIT License
Articles hosted on my blog
Home Page: https://blog.depa.do
License: MIT License
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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.
This is the comment issue for the Buffer-less Multipart POST in Golang article.
Hi,
github.com/namsral/flag
if you don't need a config file (config files are evil, see 12 factors)github.com/prometheus/client_golang/prometheus
). This is useful if your application is not a commandline toolI 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.
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.
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