Overview

This is very simple gem to allow custom validations in a ruby object. You are supposed to define your validations.

Dependencies

These are no runtime dependencies for this gem. You need minitest to run the tests for this gem.

Installation

gem install simple_validation

Usage

require "simple_validation"

class AlienNumber
  include SimpleValidation

  validate :digits_are_positive
  validate :digits_are_less_than_ten, :if => [:digits_count_even?]

  def initialize(*digits)
    @digits = digits
  end

  def value
    @digits.reduce(0) {|result, digit| result + digit}
  end

  private

  def digits_are_positive
    @digits.each do |digit|
      add_error("#{digit} is negative") unless digit > 0
    end
  end

  def digits_are_less_than_ten
    @digits.each do |digit|
      add_error("#{digit} is greater than 9") unless digit < 10
    end
  end

  def digits_count_even?
    @digits.size.even?
  end
end

valid_number = AlienNumber.new(1, 2, 3)
valid_number.valid? # true
valid_number.invalid? # false
valid_number.errors # []
valid_number.value # 6

invalid_number = AlienNumber.new(-1, 12)
invalid_number.valid? # false
invalid_number.invalid? # true
invalid_number.errors # ["-1 is negative", "12 is greater than 9"]
invalid_number.value # 11

another_invalid_number = AlienNumber.new(-10, 12, 15)
another_invalid_number.valid? # false
another_invalid_number.invalid? # true
another_invalid_number.errors # ["-10 is negative"]
another_invalid_number.value # 17

Running tests

Clone the repository and run rake from the root directory.

Contributing

• Fork the project.
• Make your feature addition or bug fix.
• Add tests for it. This is important so I don't break it in a future version unintentionally.
• Commit, but do not mess with the VERSION. If you want to have your own version, that is fine but bump the version in a commit by itself in another branch so I can ignore it when I pull.
• Send me a pull request.

License

This tool is released under the MIT license. Please refer to LICENSE for more details.