Rails - Mar 2013 - Rails 3.2 - how to write an image path in a config/initializer script ?

In my config/initializers/payday.rb  , I need to write an image path to an 
asset image ...

Currently it''s written like that :
Payday::Config.default.invoice_logo = 
"#{Rails.root}/public/images/store/logo.png"

how can I set the path, as asset_path cannot be used yet during 
initialization ?
if not possible I guess I should have a copy of the image in the public 
folder ?

thanks for feedback

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