Module: ValidationExtensions

Defined in:

lib/isbn_validation.rb

Overview

The base module that gets included in ActiveRecord::Base. Validates whether the value of the specified attribute is a proper ISBN number. Defaults to verifying that the value is either a valid ISBN-10 or ISBN-13 number but this behavior can be modified using configuration options (as shown below).

class Book < ActiveRecord::Base
  validates :isbn, isbn_format: true
  # validates :isbn10, isbn_format: { with: :isbn10 }
  # validates :isbn13, isbn_format: { with: :isbn13 }
end

Configuration options:

• :message - A custom error message (default is: “is not a valid ISBN”)

• :with - A symbol referencing the type of ISBN to validate (:isbn10 or :isbn13)

• :allow_nil - If set to true, skips this validation if the attribute is nil (default is false).

• :allow_blank - If set to true, skips this validation if the attribute is blank (default is false).

• :on - Specifies when this validation is active (default is :save, other options :create, :update).

• :if - Specifies a method, proc or string to call to determine if the validation should occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The method, proc or string should return or evaluate to a true or false value.

• :unless - Specifies a method, proc or string to call to determine if the validation should not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The method, proc or string should return or evaluate to a true or false value.

Defined Under Namespace

Modules: IsbnValidation