email required when no required rule is set about govalidator HOT 6 CLOSED

For form data, it's much more convenient if input can be validated only if non-empty.

It would be great if there were a nullable rule for optional fields, such as Laravel has.

from govalidator.

@jos- This would be more convenient if the field is present then apply validation rule, otherwise (field absent) skip the validation rule.

from govalidator.

If you are validating form-data this code should work.

package main

import (
	"encoding/json"
	"fmt"
	"net/http"

	"github.com/thedevsaddam/govalidator"
)

func handler(w http.ResponseWriter, r *http.Request) {
	rules := govalidator.MapData{
		"email": []string{"email"},
	}

	opts := govalidator.Options{
		Request:         r,     // request object
		Rules:           rules, // rules map
		RequiredDefault: false, // all the field to be pass the rules
	}
	v := govalidator.New(opts)
	e := v.Validate()
	err := map[string]interface{}{"validationError": e}
	w.Header().Set("Content-type", "application/json")
	json.NewEncoder(w).Encode(err)
}

func main() {
	http.HandleFunc("/", handler)
	fmt.Println("Listening on port: 9999")
	http.ListenAndServe(":9999", nil)
}

and if you are validating json payload this code should work:

package main

import (
	"encoding/json"
	"fmt"
	"net/http"

	"github.com/thedevsaddam/govalidator"
)

func handler(w http.ResponseWriter, r *http.Request) {
	rules := govalidator.MapData{
		"email": []string{"email"},
	}

	data := struct {
		Email string `json:"email"`
	}{}

	opts := govalidator.Options{
		Request:         r,     // request object
		Rules:           rules, // rules map
		Data:            &data,
		RequiredDefault: false, // all the field to be pass the rules
	}
	v := govalidator.New(opts)
	e := v.ValidateJSON()
	err := map[string]interface{}{"validationError": e}
	w.Header().Set("Content-type", "application/json")
	json.NewEncoder(w).Encode(err)
}

func main() {
	http.HandleFunc("/", handler)
	fmt.Println("Listening on port: 9999")
	http.ListenAndServe(":9999", nil)
}

Go Version: go version go1.10.3 darwin/amd64
Govalidator: v1.9.1

Note: If the field is present and the value is empty/invalid then the validator will throw an error. But if the field is absent in payload then it will not throw validation error.

from govalidator.

I'm stuck with the same problem for the url validation type on an optional field.

I always obtain validation errors because the field is empty while I only gave the url validator ("PersonalWebsite": []string{"url"},).

from govalidator.

I'm stuck with the same problem for the url validation type on an optional field.

I always obtain validation errors because the field is empty while I only gave the url validator ("PersonalWebsite": []string{"url"},).

Remove the field if empty from client end, if the field present in the body then it'll be stuck by validation rule

from govalidator.

Remove the field if empty from client end, if the field present in the body then it'll be stuck by validation rule

That seems hacky imo, and that also means that you'd have to do a first request form handling round to build a temporary url.Values set of non-empty fields.

(after trying out a few existing validation libraries, I built my own, which does the job for me)

from govalidator.