ProductPromotion
Logo

Go.Lang

made by https://0x3d.site

GitHub - twharmon/govalid: Struct validation using tags
Struct validation using tags. Contribute to twharmon/govalid development by creating an account on GitHub.
Visit Site

GitHub - twharmon/govalid: Struct validation using tags

GitHub - twharmon/govalid: Struct validation using tags

Govalid

Use Govalid to validate structs.

Documentation

For full documentation see pkg.go.dev.

Todo

Document use of dive. Rules are now ordered.

  • pointers: dereference and check remaining rules
  • slices / arrays: check each item with remaining rules
  • structs: validates the struct according to its own field tags (remaining rules have no meaning)

Example

package main

import (
	"errors"
	"fmt"
	"log"
	"strings"
	"unicode/utf8"

	"github.com/twharmon/govalid"
)

type Post struct {
	// ID has no constraints
	ID int

	// Title is required, must be at least 3 characters long, and
	// cannot be more than 20 characters long
	Title string `valid:"req|min:3|max:20"`

	// Body is not required, cannot be more than 10000 charachers,
	// and must be "fun" (a custom rule defined below).
	Body string `valid:"max:10000|fun"`
}

func main() {
	// Add custom string rule "fun" that can be used on any string field
	// in any struct.
	govalid.Rule("fun", func(v any) (string, error) {
		switch tv := v.(type) {
		case string:
			if float64(strings.Count(tv, "!"))/float64(utf8.RuneCountInString(tv)) > 0.001 {
				return "", nil
			}
			return "must contain more exclamation marks", nil
		default:
			return "", errors.New("fun constraint must be applied to string only")
		}
	})

	p := Post{
		ID:    5,
		Title: "Hi",
		Body:  "Hello world!",
	}

	vio, err := govalid.Validate(&p)
	if err != nil {
		log.Fatalln(err)
	}

	fmt.Println(vio)
}

Contribute

Make a pull request.

Articles
to learn more about the golang concepts.

Resources
which are currently available to browse on.

mail [email protected] to add your project or resources here ๐Ÿ”ฅ.

FAQ's
to know more about the topic.

mail [email protected] to add your project or resources here ๐Ÿ”ฅ.

Queries
or most google FAQ's about GoLang.

mail [email protected] to add more queries here ๐Ÿ”.

More Sites
to check out once you're finished browsing here.

0x3d
https://www.0x3d.site/
0x3d is designed for aggregating information.
NodeJS
https://nodejs.0x3d.site/
NodeJS Online Directory
Cross Platform
https://cross-platform.0x3d.site/
Cross Platform Online Directory
Open Source
https://open-source.0x3d.site/
Open Source Online Directory
Analytics
https://analytics.0x3d.site/
Analytics Online Directory
JavaScript
https://javascript.0x3d.site/
JavaScript Online Directory
GoLang
https://golang.0x3d.site/
GoLang Online Directory
Python
https://python.0x3d.site/
Python Online Directory
Swift
https://swift.0x3d.site/
Swift Online Directory
Rust
https://rust.0x3d.site/
Rust Online Directory
Scala
https://scala.0x3d.site/
Scala Online Directory
Ruby
https://ruby.0x3d.site/
Ruby Online Directory
Clojure
https://clojure.0x3d.site/
Clojure Online Directory
Elixir
https://elixir.0x3d.site/
Elixir Online Directory
Elm
https://elm.0x3d.site/
Elm Online Directory
Lua
https://lua.0x3d.site/
Lua Online Directory
C Programming
https://c-programming.0x3d.site/
C Programming Online Directory
C++ Programming
https://cpp-programming.0x3d.site/
C++ Programming Online Directory
R Programming
https://r-programming.0x3d.site/
R Programming Online Directory
Perl
https://perl.0x3d.site/
Perl Online Directory
Java
https://java.0x3d.site/
Java Online Directory
Kotlin
https://kotlin.0x3d.site/
Kotlin Online Directory
PHP
https://php.0x3d.site/
PHP Online Directory
React JS
https://react.0x3d.site/
React JS Online Directory
Angular
https://angular.0x3d.site/
Angular JS Online Directory