[demo] Vaidator for size of an integer

mongomapper_integer_size_limit.rb

class TestCucc
  include MongoMapper::Document
  key :cucc,        Integer
  validates_true_for :cucc,
    :logic   => lambda { | x | x.cucc >= 1 && x.cucc <= 5 },
    :message => "must be in the following range: 1 to 5"
end

=begin
ruby-1.9.2-p0 > load "t.rb"
 => ["TestCucc"] 
ruby-1.9.2-p0 > c = TestCucc.new
 => #<TestCucc _id: BSON::ObjectId('4cc2225b14f6fc3873000001'), cucc: nil> 
ruby-1.9.2-p0 > c.cucc = 8
 => 8 
ruby-1.9.2-p0 > c.save
 => false 
ruby-1.9.2-p0 > c.errors
 => #<Validatable::Errors:0x95eff98 @errors={:cucc=>["must be in the following range: 1 to 5"]}> 
ruby-1.9.2-p0 > 
=end