How to get Rails build and fields_for to create only a new record and not include existing?

Question

I am using build, fields_for, and accepts_nested_attributes_for to create a new registration note on the same form as a new registrati

Answer 1

If you want to create a new registration form on your edit action, you can just instantiate a new registration_note object. Right now, your form is for the existing registration object.

I believe this is what you want:

class RegistrationsController < ApplicationController
  def edit
    @new_registration_note = RegistrationNote.new
    @registration = Registration.find(params[:id])
    @registration.registration_notes.build
  end
end

In your view, you should pass a hidden param that references the registration record id:

<%= form_for @new_registration_note do |r| %>
  <%= r.hidden_field :registration_id, :value => @registration.id  %>
  <%= r.text_area :content  %>
<% end %>

Now, you can create your new registration note that belongs to @registration. Make sure you have a column in your registration_notes table to point to the registration. You can read more about associations here: http://guides.rubyonrails.org/association_basics.html