Create a nested form.

[Linus Pettersson]

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?

[Charles A. Lopez]

is there a way to check if the participant field is already created before creating it?  

Is_A and Has_A relationships. Describe the relationship between the forms

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[Linus Pettersson]

I don't quite understand what you mean.

Do you understand my problem?

When the user enters the information into the form correctly and it validates everything works great. However, if it is not correctly filled out the "new" action will get re-rendered and displaying the form errors. The issue is that instead of showing 2 Participant "fields groups" it now displays 4, using the code above.

Den onsdagen den 4:e april 2012 kl. 20:55:43 UTC+2 skrev Charles:

is there a way to check if the participant field is already created before creating it?  

Is_A and Has_A relationships. Describe the relationship between the forms

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[Charles A. Lopez]

when your validation fails you're calling "new" again. you should create something called "validate" 

the path created does not provide desired results. Create a different path. 

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