Factory Girl with database accesses stubbed. The versions 2+ only work with Rails 3 (AR 3+) for stubbing queries. Now handle Rails 3 (only Rails 3) queries stubbing, Transform rail3 queries into ruby select on Plants created with factory boy. Example user = Plant(:user => 'toto', :addresses => [Plant(:address, :street => 'here')]) User.where(:name => 'toto').where('addresses.street = 'here').joins(:addresses) will be stubbed into a select ruby on plants and return here, user. See more on github and in unit tests.