[rspec-users] set_fixture_class works on individual test, but test suite fails

David Chelimsky dchelimsky at gmail.com
Mon Nov 14 23:28:17 EST 2011

On Nov 8, 2011, at 10:52 AM, Stephen Kessler wrote:

> Hi all,
> I have a bug in my code that I have been unable to track down that
> deals with the set_fixture_class statement.  Basically,
> set_fixture_class (and my tests) are working fine when I test one
> controller in isolation, but they are failing when I run all my
> controller specs together.
> My project use both a local database and Amazon Rds, and the tables on
> Amazon are namespaced with Rds::TableName.
> My controller spec looks something like:
> describe MyFirstController do
>  set_fixture_class :users => Rds::User

set_fixture_class is defined in rails: https://github.com/rails/rails/blob/master/activerecord/lib/active_record/fixtures.rb#L745

It's a class method that interacts with a class_attribute defined in the same file: https://github.com/rails/rails/blob/master/activerecord/lib/active_record/fixtures.rb#L727

This means that once it's set, it's set, which explains the behavior you're seeing.

You can get around this by storing the original setting and restoring it in an after block:

before do
  @orig = self.class.fixture_class_names[:users]
  self.class.fixture_class_names[:users] = Rds::User

after do
  self.class.fixture_class_names[:users] = Rds::User

This is very invasive as it interacts directly with variables instead of APIs, so it might easily break in a future version of rails, but I'm not sure what better option you have. It's not really designed to be used how you're using it.


> describe 'my test' do
>    it 'should do something' do
>      joe = users(:joe)
>    end
>  end
> end
> This works fine when running just this controller's spec.  But when I
> run all the controller specs, the error I get is:
> Failure/Error: joe = users(:joe)
> FixtureClassNotFound:
>       No class attached to find.
> I have isolated the problem to the interaction between two controller
> specs, MyFirstController (which contains set_fixture_class) and
> MySecondController (which does not contain set_fixture_class).  When
> the tests for MyFirstController are run before the tests for
> MySecondController, everything works fine.  But when the order is
> reversed, I get the above errors.
> Any ideas on what I might be able to do to fix this (besides requiring
> MyFirstController to run first)?
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> rspec-users at rubyforge.org
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