Possible to use sifters in other sifters?

[bostrom]

Sifters seem to be great for a single model only. I'm trying to use one model's sifters in another model, but I can't seem to know how to do it, if possible.

According to the docs, sifters are used in where conditions like so

Person.joins(:articles).
       where{
         {articles => sift(:title_or_body_contains, 'awesome')}
       }

How can I include that article sifter in a sifter for the Person model? Lets say, for example, that I want to create a sifter for Persons whose first name is included in the article's title. Is that possible or am I thinking backwards here?