Rails 4 order by virtual attribute

Rails 4 order by virtual attribute

I have a Product model which has name and description columns in the
database.
I also have a Product.search_results_for(query), where query is a string
like "Green Apple".
I need to return an ActiveRecord::Relation of the results ordered by which
is the best hit. Currently, I'm setting a search_result_value to each
product. search_result_value IS NOT a column in the database, and I don't
want it to be.
So in essence, I have an ActiveRecord::Relation of Products that I need to
order by search_result_value without changing it to an array, which is an
instance variable that isn't stored in the database. How can I do this?
Something like this:
Product.order(:search_result_value)