example code for dm-validations

auto_validation.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'dm-core'
require 'dm-validations'
require 'dm-transactions'
require 'dm-migrations'
require 'dm-types'

class Card
  include DataMapper::Resource
  property :id, Serial
  property :location, String
  property :mac_addr, String, :required => true,
    :unique_index => :mac_addr_upload_key_uniq
  property :upload_key, String, :required => true,
    :unique_index => :mac_addr_upload_key_uniq
  has n, :photos
end

class Photo
  include DataMapper::Resource
  property :id, Serial
  property :width, Integer
  property :height, Integer
  property :path, String
  property :created_at, DateTime
  property :deleted_at, ParanoidDateTime, :required => false
  belongs_to :card
  # http://datamapper.org/docs/validations.html
  #
  # before :create, :set_filepath  # <= not working.
  before :valid?, :set_filepath    # <= working
  def set_filepath
    if attribute_get(:path).nil?
      attribute_set :path, 'hey!'
    end
  end
end

DataMapper.finalize
DataMapper::Logger.new($stderr, :debug)
DataMapper.setup(:default, "sqlite::memory:")
DataMapper.auto_migrate!

# Insert card information for development
card = Card.new(:mac_addr   => 'dummy',
                :upload_key => 'dummy',
                :location => 'Room')

unless card.save
  puts "validation error #1"
  card.errors.each do |e|
    puts e
  end
else
  puts "valid entry (card)."
end

photo = card.photos.new(:width => 1,
                        :height => 1)

unless photo.save
  puts "validation error #2"
  photo.errors.each do |e|
    puts e
  end
end