Rails creating a form on a show template with nested_attributes - ruby-on-rails

Question

I have a rails app with events and event_registrants, someone can essentially register for an event.
Here's my event model:
class Event < ActiveRecord::Base
has_many :event_registrants, :dependent => :destroy
accepts_nested_attributes_for :event_registrants, :reject_if => lambda { |a| a[:first_name].blank? }, :allow_destroy => true
Here's my event_registrant model:
class EventRegistrant < ActiveRecord::Base
belongs_to :event
attr_accessible :comment, :company, :email, :first_name, :last_name, :phone, :event_id
validates_presence_of :company, :email, :first_name, :last_name, :phone
end
On the show template, I'd like to include a form to allow someone to register directly from there.
<%= form_for #event do |f| %>
<%= f.fields_for :event_registrants do |builder| %>
<%= render "registration_form", :f => builder %>
<% end %>
<%= f.submit 'Send it', :class => "blue-btn", :id => "registrant_submit" %>
<% end %>
Partial:
<ul class="form" id="register_form">
<li><%= f.text_field :first_name, :placeholder => "First name *" %> <%= f.text_field :last_name, :placeholder => "Last name *" %></li>
<li><%= f.text_field :email, :placeholder => "Email address *", :class => 'wide' %></li>
<li><%= f.text_field :company, :placeholder => "Company name *", :class => 'wide' %></li>
<li><%= f.text_field :phone, :placeholder => "Phone number *", :maxlength => '14' %></li>
<li><%= f.text_area :comment, :placeholder => "Additional info", :class => 'wide', :rows => 4, :cols => 68 %></li>
</ul>
Finally my events controller'
def show
#event = Event.where(:event_hosting_type => "eureka_event").find_by_permalink(params[:id])
1.times {#event.event_registrants.build}
respond_to do |format|
format.html # show.html.erb
format.json { render json: #event }
end
end
def update
#event = Event.find_by_permalink(params[:id])
respond_to do |format|
if #event.update_attributes(params[:event])
format.html { redirect_to #event, notice: "#{#event.title} updated." }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: #event.errors, status: :unprocessable_entity }
end
end
end
def create
#event = Event.new(params[:event])
#event_registrant = #event.build_event_registrant
respond_to do |format|
if #event.save
format.html { redirect_to #event, notice: 'New event created.'}
format.json { render json: #event, status: :created, location: #event }
else
format.html { render action: "new" }
format.json { render json: #event.errors, status: :unprocessable_entity }
end
end
end
The issue I'm having is that the current form will display but will only update the current record, having 1.times {#event.event_registrants.build} will add a new, empty form but the previous entry will be there. I'd like someone to submit their info, have the form reset and allow someone else to submit new info.

Answer 1

You can update your code to say
1.times {#event.event_registrants.build} if #event.event_registrants.empty?
Your form will properly show the value of event_registrants if it exists, or build it if not there.
However, if you're looking to dynamically add or remove form fields, you may find the cocoon gem an easy way to handle the javascript/ruby involved with that.