ActiveAdmin with has_many problem; undefined method 'new_record?'
go to your Recipe model and add the following line
accepts_nested_attributes_for :stepsThe line is required by formtastic, not active admin. Check https://github.com/justinfrench/formtastic for formtastic documentation
class Recipe < ActiveRecord::Base attr_accessible :step_attributes has_many :steps accepts_nested_attributes_for :stepsend