ruby on rails - What's the best way to update items that belong to a collection? -

i have section model has many sectiontests. each sectiontest has 'position' attribute.

i creating screen allows user alter position attribute sectiontests in section. i'm updating single attribute of collection.

what best way of doing in routes , controller?

here current routes file :

resources :sections   resources :section_tests end 

my first thoughts in 'edit' action of 'section_tests' controller, 'edit' used edit attributes of single model.

where put code?

if understand correctly, trying update section linked section_test? use active record callback after_save in sectiontest model.