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

Thank you so much for your help as I said in my post the only problem with the approach from "Zaid Crouch"(I don't know how to make a reference to a user hehe) is that if the form has error fields the form will be clear and boom after the page reloading you'll have nothing filled in your form and can you imagine if you form is like 20 or 30 fields that would be a terrible user experience of course

Here is my solution that works with validation models:

class Registration < ActiveRecord::Base
  attr_accessible :foo, :bar, :registration_notes_attributes
  has_many :registration_notes
  has_one :new_registration, class_name: 'RegistrationNote'
  accepts_nested_attributes_for :new_registration
end

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

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

I'm using simple_form in my example if you want to see the same working with validations and transaction take a look at the complete post here: http://elh.mx/ruby/using-simple_form-for-nested-attributes-models-in-a-has_many-relation-for-only-new-records/