Rails - Mar 2010 - where do you put helper functions for fixture generation?

I''m writing a fixture in test/fixtures/parrots_model.yml, and
I''m
happily using ERB to flesh out my fixture.  Suddenly, I realize that I
need a helper function to call from my erb code, such as:

polly:
  subtype: parakeet
  weight_kg: <%= ounces_to_kg(22.3) %>

alex:
  subtype: african gray
  weight_kg: <%= ounces_to_kg(170.3) %>

Where''s the right place to stash the "ounces_to_kg()"
function so that
it''s available when I rake db:load:fixtures?  (And does the answer
change if its a method specific to the parrot model?)

tia.

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