Nested form in activeadmin not saving updates

Question

I have a nested form in ActiveAdmin for these models (a :class_section has_many :class_dates):

class ClassDate < ActiveRecord::Base
  belongs_to :class_s         


        

Answer 1

You need to permit nested parameters, but you should never use params.permit!. It's extremely unsafe. Try this:

ActiveAdmin.register ClassSection do
  permit_params :max_students, :min_students, :info, :class_course_id, :location_id, 
                class_dates_attributes: [ :id, :start_time, :end_time, :_destroy ]

  form do |f|
    # ...
    f.inputs "Dates" do
      f.has_many :class_dates, heading: false, allow_destroy: true do |cd|
        cd.input :start_time, :as => :datetime_picker
        cd.input :end_time, :as => :datetime_picker
      end
    end
    f.actions
  end

  # ...
end

The configuration (and permitted_params) of your ClassDate admin panel has nothing to do with the permitted parameters within the ClassSection admin panel. Treat them as separate controllers within the app.

Adding the allow_destroy: true option to the has_many call will add a checkbox to the form to allow you to delete a class time upon form submission.