Show broken boolean coercion with the mongoid gem loaded. See: https://github.com/solnic/virtus/issues/132

broken_boolean_coercion.rb

require 'virtus'
require 'minitest/spec'
require 'minitest/autorun'

class A
  include Virtus
  attribute :foo, Boolean
end

describe 'without mongoid' do
  it 'is works' do
    A.new(:foo => 'true').foo.must_equal true
  end
end

class B
  include Virtus

  puts "==> before mongoid: #{Boolean.ancestors}"
  require 'mongoid'
  puts "==> after mongoid: #{Boolean.ancestors}"

  attribute :foo, Boolean
  # Using Virtus::Attribute::Boolean instead of Boolean is a workaround here.
end


describe 'with mongoid' do
  it 'is broken' do
    B.new(:foo => 'true').foo.must_equal true
  end
end 

gistfile1.txt

$ ruby -v; gem list; ruby broken_boolean_coercion.rb 
ruby 1.9.3p327 (2012-11-10 revision 37606) [x86_64-linux]

*** LOCAL GEMS ***

activemodel (3.2.9)
activesupport (3.2.9)
backports (2.6.5)
builder (3.0.4)
bundler (1.2.3)
descendants_tracker (0.0.1)
i18n (0.6.1)
mongoid (3.0.15)
moped (1.3.1)
multi_json (1.5.0)
origin (1.0.11)
rake (10.0.3)
rubygems-bundler (1.1.0)
rubygems-tasks (0.2.3)
rvm (1.11.3.5)
tzinfo (0.3.35)
virtus (0.5.4)
==> before mongoid: [Virtus::Attribute::Boolean, Virtus::Attribute::Object, Virtus::Attribute, #<Virtus::Equalizer:0x000000009d56c0>, Virtus::Equalizer::Methods, Object, MiniTest::Expectations, Kernel, BasicObject]
==> after mongoid: [Boolean, Object, Mongoid::Extensions::Object, Moped::BSON::Extensions::Object, Origin::Extensions::Object, JSON::Ext::Generator::GeneratorMethods::Object, MiniTest::Expectations, Kernel, BasicObject]
Run options: --seed 46930

# Running tests:

F.

Finished tests in 0.020978s, 95.3366 tests/s, 95.3366 assertions/s.

  1) Failure:
test_0001_is_broken(with mongoid) [broken_boolean_coercion.rb:29]:
Expected: true
  Actual: "true"

2 tests, 2 assertions, 1 failures, 0 errors, 0 skips
$