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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