ActiveAdmin.register KnowledgeBase::Sectionables::Attachments::List do menu parent: I18n.t('activerecord.models.knowledge_base/section/kind.other') index do selectable_column column :links do |list| list.attachments.map(&:title).join ", " end actions end form do |f| f.has_many :attachments do |f| f.input :title f.input :file f.input :description f.input :style end f.actions end end