Tools / Validate

Validate

This package provides a framework for writing validations for Go applications.

Repository: gobuffalo/validate
Forks: 11
Watchers: 7
Stars: 10

github.com/gobuffalo/validate

Build Status GoDoc

This package provides a framework for writing validations for Go applications. It does provide you with few validators, but if you need others you can easly build them.

Installation

$ go get github.com/gobuffalo/validate

Usage

Using validate is pretty easy, just define some Validator objects and away you go.

Here is a pretty simple example:

package main

import (
	"log"

	v "github.com/gobuffalo/validate"
)

type User struct {
	Name  string
	Email string
}

func (u *User) IsValid(errors *v.Errors) {
	if u.Name == "" {
		errors.Add("name", "Name must not be blank!")
	}
	if u.Email == "" {
		errors.Add("email", "Email must not be blank!")
	}
}

func main() {
	u := User{Name: "", Email: ""}
	errors := v.Validate(&u)
	log.Println(errors.Errors)
  // map[name:[Name must not be blank!] email:[Email must not be blank!]]
}

In the previous example I wrote a single Validator for the User struct. To really get the benefit of using go-validator, as well as the Go language, I would recommend creating distinct validators for each thing you want to validate, that way they can be run concurrently.

package main

import (
	"fmt"
	"log"
	"strings"

	v "github.com/gobuffalo/validate"
)

type User struct {
	Name  string
	Email string
}

type PresenceValidator struct {
	Field string
	Value string
}

func (v *PresenceValidator) IsValid(errors *v.Errors) {
	if v.Value == "" {
		errors.Add(strings.ToLower(v.Field), fmt.Sprintf("%s must not be blank!", v.Field))
	}
}

func main() {
	u := User{Name: "", Email: ""}
	errors := v.Validate(&PresenceValidator{"Email", u.Email}, &PresenceValidator{"Name", u.Name})
	log.Println(errors.Errors)
        // map[name:[Name must not be blank!] email:[Email must not be blank!]]
}

That's really it. Pretty simple and straight-forward Just a nice clean framework for writing your own validators. Use in good health.

Built-in Validators

To make it even simpler, this package has a children package with some nice built-in validators.

package main

import (
	"log"

	"github.com/gobuffalo/validate"
	"github.com/gobuffalo/validate/validators"
)

type User struct {
	Name  string
	Email string
}


func main() {
	u := User{Name: "", Email: ""}
	errors := validate.Validate(
		&validators.EmailIsPresent{Name: "Email", Field: u.Email, Message: "Mail is not in the right format."},
		&validators.StringIsPresent{Field: u.Name, Name: "Name"},
	)
	log.Println(errors.Errors)
	// map[name:[Name can not be blank.] email:[Mail is not in the right format.]]
}

All fields are required for each validators, except Message (every validator has a default error message).

Available Validators

A full list of available validators can be found at https://godoc.org/github.com/gobuffalo/validate/validators.

License: MIT License - A short and simple permissive license with conditions only requiring preservation of copyright and license notices. Licensed works, modifications, and larger works may be distributed under different terms and without source code.

MIT License

Copyright (c) [year] [fullname]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.