Datamapper DataMapper

Models aren't saved when property with one of this type is set.
There's no problem with other types.

Gemfile:

 source 'http://rubygems.org'
 gem 'dm-migrations',        '~> 1.0.0.rc2',  :git => 'git://github.com/datamapper/dm-migrations.git'
 gem 'dm-types',             '~> 1.0.0.rc2',  :git => 'git://github.com/datamapper/dm-types.git'
 gem 'dm-postgres-adapter',  '~> 1.0.0.rc2',  :git => 'git://github.com/datamapper/dm-postgres-adapter.git'
 gem 'dm-mysql-adapter',     '~> 1.0.0.rc2',  :git => 'git://github.com/datamapper/dm-mysql-adapter.git'
 gem 'dm-sqlite-adapter',    '~> 1.0.0.rc2',  :git => 'git://github.com/datamapper/dm-sqlite-adapter.git'
 gem 'dm-core',              '~> 1.0.0.rc2',  :git => 'git://github.com/datamapper/dm-core.git'
 gem 'dm-do-adapter',        '~> 1.0.0.rc2',  :git => 'git://github.com/datamapper/dm-do-adapter.git'
 gem 'json'

test.rb:

 require 'bundler'
 Bundler.setup
 Bundler.require(:default)







 DataMapper.setup(:default, 'postgres://postgres@localhost/test')
 # DataMapper.setup(:default, 'mysql://root@localhost/test')
 # DataMapper.setup(:default, 'sqlite3::memory:')







 class ModelIpAddress
   include DataMapper::Resource
   property :id, Serial
   property :addr, IPAddress
 end
 class ModelFilePath
   include DataMapper::Resource
   property :id, Serial
   property :body, FilePath
 end
 class ModelJson
   include DataMapper::Resource
   property :id, Serial
   property :body, Json
 end







 DataMapper.auto_migrate!







 record = ModelIpAddress.new :addr => '127.0.0.1'
 p record                # => #<ModelIpAddress @id=nil @addr=#<IPAddr: IPv4:127.0.0.1/255.255.255.255>>
 p record.save           # => true
 p ModelIpAddress.all    # => []







 record = ModelFilePath.new :body => '/usr/local'
 p record              # => #<ModelFilePath @id=nil @body=#<Pathname:/usr/local>>
 p record.save         # => true
 p ModelFilePath.all   # => []







 record = ModelJson.new :body => { :tast => "test" }
 p record          # => #<ModelJson @id=nil @body={:tast=>"test"}>
 p record.save     # => true
 p ModelJson.all   # => []