module Madmin module Fields class HasMany < Field def options_for_select(record) association = record.class.reflect_on_association(attribute_name) klass = association.klass klass.all.map do |r| ["#{klass.name} ##{r.id}", r.id] end end def to_param {"#{attribute_name.to_s.singularize}_ids".to_sym => []} end end end end