Rails core - Nov 2012 - has_one :through NoMethodError: undefined method `klass' for nil:NilClass when doing class_name on reflection

Not sure if this is expected or not. Only happened with a has_one :through 
I had setup. (Workaround is just to remove it and go through the 
association manually vs has_one ..., through: .)

Not a big deal if no one has time to look at it, as it''s not a big
enough
deal to look into a fix on our side.

In Rails (3.2.9) console if I do:

MyModel.reflections.each {|name,reflection| reflection.class_name }

it raises:

NoMethodError: undefined method `klass'' for nil:NilClass
    from 
/path/to/rvm/gems/ruby-1.9.3-p194@my_project/gems/activerecord-3.2.9/lib/active_record/reflection.rb:385:in
`block in source_reflection''
    from 
/path/to/rvm/gems/ruby-1.9.3-p194@my_project/gems/activerecord-3.2.9/lib/active_record/reflection.rb:385:in
`collect''
    from 
/path/to/rvm/gems/ruby-1.9.3-p194@my_project/gems/activerecord-3.2.9/lib/active_record/reflection.rb:385:in
`source_reflection''
    from 
/path/to/rvm/gems/ruby-1.9.3-p194@my_project/gems/activerecord-3.2.9/lib/active_record/reflection.rb:530:in
`derive_class_name''
    from 
/path/to/rvm/gems/ruby-1.9.3-p194@my_project/gems/activerecord-3.2.9/lib/active_record/reflection.rb:127:in
`class_name''
    from (irb):6:in `block in irb_binding''
    from (irb):6:in `each''
    from (irb):6
    from 
/path/to/rvm/gems/ruby-1.9.3-p194@my_project/gems/railties-3.2.9/lib/rails/commands/console.rb:47:in
`start''
    from 
/path/to/rvm/gems/ruby-1.9.3-p194@my_project/gems/railties-3.2.9/lib/rails/commands/console.rb:8:in
`start''
    from 
/path/to/rvm/gems/ruby-1.9.3-p194@my_project/gems/railties-3.2.9/lib/rails/commands.rb:41:in
`<top (required)>''
    from script/rails:6:in `require''
    from script/rails:6:in `<main>''

Simplified versions of models:

class MyModel < ActiveRecord::Base

  has_one :bar, through: :foo

end


class Foo < ActiveRecord::Base
  
  self.table_name = :somenonstandardnamehere
  self.primary_key = :nonstandardish_id
  
  # ...
  has_one :bar, foreign_key: ''anothernonstandard_id''
  
end

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