Ruby on Rails

Hi!

I have created a nested form and now I want to make it dynamic. I have two models, "Applications" and "Participants". Each application may have several participants, but at least one which is the contact person. An issue that I have is that when the form is not validated it renders the participants fields twice.

- How can I avoid that?

# Applications/new.html.erb

<div class="row span8 offset2 form-wrapper">

<h1>Ny anmälan</h1>

<%= semantic_form_for @application, :html => { :class => "form-horizontal" } do |f| %>

<%= f.semantic_errors %>

<%= f.inputs do %>

<%= f.inputs :for => :participants, :name => "Kontaktperson", :class => "participants_form well" do |p| %>

<%= p.input :name, :label => "Namn", :required => true %>

<%= p.input :address, :label => "Adress", :required => true %>

<%= p.input :phone, :label => "Mobiltelefon", :required => true %>

<%= p.input :email, :label => "Epostadress", :as => :email, :required => true %>

<%= p.input :age, :label => "Ålder" %>

<%= p.input :has_something, :label => "Ja..." %>

<%= p.input :special_food, :label => "Annan specialkost" %>

<%= p.input :is_contact, :as => :hidden, :value => true %>

<% end %>

<%= f.inputs :class => "participants_fields" do %>

<%= render "participant_form", :f => f %>

<% end %>

<%= link_to "<i class=\"icon-plus-sign\"> </i> Lägg till fler deltagare...".html_safe, "#", :class => "btn pull-right" %>

<%= f.inputs :name => "Övrig information" do %>

<%= f.input :extra_information, :input_html => { :class => "span4", :rows => 3 } %>

<%= f.input :membership_paid, :label => "JA" %>

<% end %>

<% end %>

<%= f.buttons do %>

<%= f.submit :value => "Skicka anmälan", :class => "btn btn-primary btn-large commit create" %>

<% end %>

<% end %>

</div>

# Applications Controller

def new

@application = Application.new

@application.participants.build

respond_to do |format|

format.html

format.js { render :nothing }

end

end

def create

@application = Application.new(params[:application])

if @application.save

flash[:notice] = "Din anmälan har skickats!"

redirect_to root_path

else

flash[:error] = "Det gick inte att spara din anmälan"

render :action => "new"

end

end

I guess that my participants gets built again when it renders the new action in the "create" method. But how can I avoid that?

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