Ruby on Rails

Hello,

i am trying to set a default scope so I can pass a proc as argument. This is the code:

default_scope lambda { where("language = ?", I18n.locale.to_s) }

When I try to get the values, the following error is raised:

NoMethodError: undefined method `includes_values' for #<Proc:0xb6d85b9c>
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activerecord-3.0.0.beta4/lib/active_record/relation/spawn_methods.rb:10:in `send'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activerecord-3.0.0.beta4/lib/active_record/relation/spawn_methods.rb:10:in `merge'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activerecord-3.0.0.beta4/lib/active_record/relation/spawn_methods.rb:9:in `each'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activerecord-3.0.0.beta4/lib/active_record/relation/spawn_methods.rb:9:in `merge'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activerecord-3.0.0.beta4/lib/active_record/base.rb:984:in `construct_finder_arel'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activerecord-3.0.0.beta4/lib/active_record/base.rb:1193:in `default_scope'
    from /home/daniel/projects/ci_conferencer/app/models/speaker.rb:15
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:418:in `load'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:418:in `load_file'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:554:in `new_constants_in'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:417:in `load_file'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:313:in `require_or_load'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:455:in `load_missing_constant'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:156:in `const_missing'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:154:in `each'
    from /home/daniel/.rvm/gems/ruby-1.8.7-p299/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:154:in `const_missing'

Does anybody know how to deal with this problem? has this issue been fixed?

I have googled it but I haven't found any solution =S help me please.

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