this error usually occurs when trying to mix 1st and 2nd order relationships in a single to_json call:
undefined method `macro' for nil:NilClass Rails 3 has this way to support 2nd order relationships: http://apidock.com/rails/ActiveRecord/Serialization/to_json So I try to use it: @units = User.where(:id => params[:user_id]).first.units.to_json(:include => { :only => :reports, :notifications => {:include => {:only => :notification_codes} } }) A unit has many reports and notifications. And a notification belongs to notification code. This is the relationship between notifications and notification codes: //notifications belongs_to :notification_code, :foreign_key => :code //notification codes has_many :notifications So I am not sure why error occurs. Thanks for response -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
