validation-clj

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A validation library for Clojure.

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# VALIDATION-CLJ [![Build Status](https://travis-ci.org/r0man/validation-clj.png)](https://travis-ci.org/r0man/validation-clj)

A simple validation library for Clojure.

## Installation

Via Clojars: http://clojars.org/validation-clj

## Usage

Need some records validated?

(def *alice* {:nick "alice" :email "alice"})

(def *bob*
      {:nick "bob"
       :email "bob@example.com"
       :password "secret"
       :password-confirmation "secret"})

Use the validation library.

(use 'validation.core 'validation.errors)

Define a validation which generates the valid-user?, validate-user and
validate-user! functions.

(defn new-user? [user]
      (nil? (:id user)))

(defvalidate user
      (presence-of :nick)
      (min-length-of :nick 2)
      (max-length-of :nick 16)
      (presence-of :email)
      (is-email :email)
      (presence-of :password :if new-user?)
      (confirmation-of :password :if new-user?))

The valid-user? fn checks if the record is valid or not.

(valid-user? *alice*)
    ;=> false

(valid-user? *bob*)
    ;=> true

The validate-user fn returns the record itself with possible error
messages attached to the metadata.

(validate-user *alice*)
    ;=> {:nick "alice"}

(validate-user *bob*)
    ;=> {:nick "bob"
    ;    :email "bob@example.com"
    ;    :password "secret"
    ;    :password-confirmation "secret"}

The error-messages reads the error messages from the meta data of the
validated record.

(error-messages (validate-user *bob*))
    ;=> nil

(error-messages (validate-user *alice*))
    ;=> {:email ["is not a valid email address." "can't be blank."]
    ;    :password ["can't be blank."]}

The validate-user! fn is similar to validate-user, but uses the
error-kit condition system to signal validation errors.

(use 'slingshot.core)

(try+
      (validate-user! *alice*)
      (catch validation.error {user :record errors :errors}
        errors))
    ;=> {:email ["is not a valid email address." "can't be blank."]
    ;    :password ["can't be blank."]}

(validate-user! *bob*)
    ;=> {:nick "bob"
    ;    :email "bob@example.com"
    ;    :password "secret"
    ;    :password-confirmation "secret"}

For anything else look at the tests ...

## License

Distributed under the Eclipse Public License, the same as Clojure.

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