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

I am using build, fields_for, and accepts_nested_attributes_for to create a new registration note on the same form as a new registration (has many registration notes). Great.

Problem: On the edit form for the existing registration, I want another new registration note to be created, but I don't want to see a field for each of the existing registration notes.

I have this

class Registration < ActiveRecord::Base
  attr_accessible :foo, :bar, :registration_notes_attributes
  has_many :registration_notes
  accepts_nested_attributes_for :registration_notes
end

and this

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

and in the view I am doing this:

<%= form_for @registration do |r| %>
  <%= r.text_field :foo %>
  <%= r.text_field :bar %>
  <%= r.fields_for :registration_notes do |n| %>
    <%= n.text_area :content %>
  <% end %>
<% end %>

and it is creating a blank text area for a new registration note (good) and each existing registration note for that registration (no thank you).

Is there a way to only create a new note for that registration and leave the existing ones alone?

ruby-on-rails

Edit Report

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

answered 2013-02-14T22:04:50.530

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

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