Using factory_girl_rails with Rspec on namespaced models

I have a minimal working example here, maybe you could use it to pinpoint where your problem is. The comment you left on dmarkow’s answer suggests to me that you have an error someplace else.

app/models/bar/foo.rb

class Bar::Foo < ActiveRecord::Base
end

*db/migrate/20110614204536_foo.rb*

class Foo < ActiveRecord::Migration
  def self.up
    create_table :foos do |t|
      t.string :name
    end
  end

  def self.down
    drop_table :foos
  end
end

spec/factories.rb

Factory.define :foo, :class => Bar::Foo do |f|
  f.name 'Foooo'
end

*spec/models/foo_spec.rb*

require 'spec_helper'

describe Bar::Foo do

  it 'does foo' do
    foo = Factory(:foo)
    foo.name.should == 'Foooo'
  end
end

Running the test:

$ rake db:migrate
$ rake db:test:prepare
$ rspec  spec/models/foo_spec.rb 
.

Finished in 0.00977 seconds
1 example, 0 failures

Hope it helps.