How to write filters for methods (not fields) in Active Admin? -

i have active admin index page resource.

activeadmin.register request   index     column :created_at     column :content     column "approved", :approved?     default_actions   end    filter :created_at   filter :content   filter :approved? end 

the problem doesn't generate filter approved? request (but generates column properly). think it's because approved method , returns true if approved_at isn't nil. how can write filter in case?

try create filter button using scopes:

# model/request.rb scope :approved, where("approved_at not null")  # or...if have other default values on approved_at column can try scope :approved, where("approved not", nil) scope :approved, where("approved not ?", "")  #app/admin/requests.rb scope :approved 

some more info on scopes in active admin: http://activeadmin.info/docs/2-resource-customization.html#scoping_the_queries