Create multiple models at once using fields_for

edit.html.erb

<h1>Editing event</h1>

<%= twitter_bootstrap_form_for(@event) do |f| %>
  <%= f.inputs "General" do %>
    <%= render :partial => 'form', :locals => { :f => f } %>
  <% end %>

  <%= f.inputs "Jobs" do %>
    <%= f.fields_for(:jobs, @new_jobs) do |jf| %>
      <%= jf.hidden_field :name %>
      <%= jf.text_field :expected_time, :add_on => :prepend do %>
        <span class="add-on"><%= jf.object.name %></span>
      <% end %>
    <% end %>
  <% end %>
  <div class="actions">
    <%= f.submit 'Edit event' %>
  </div>
<% end %>

event.rb

class Event < ActiveRecord::Base
  has_many :jobs

  accepts_nested_attributes_for :jobs
end

events_controller_spec.rb

class EventsController < ApplicationController

  ...

  def edit
    @event = Event.find(params[:id])

    unless @event.jobs_finalized?
      @new_jobs = Job.template_jobs
    end
  end

  def update
    @event = Event.find(params[:id])

    @event.attributes = params[:event]
    if @event.save
      if params[:event][:jobs_attributes]
        @event.jobs_finalized = true
        @event.save
      end
      flash[:notice] = 'Event was successfully updated'
      redirect_to event_path(@event)
    else
      render :action => :edit
    end
  end
end