What you want to use is :accept_nested_attributes in your models
class Profile < ActiveRecord::Base
has_many :responsibles
accepts_nested_attributes :responsibles
end
And then you'll want to do something like this in your view
<% form_for @profile do |profile_form| %>
<%= profile_form.label :name %>
<%= profile_form.text_field :name %>
<% profile_form.fields_for :responsibles do |child_form| %>
<%= child_form.label :name %>
<%= child_form.text_field :name %>
<% unless child_form.object.new_record? %>
<%= child_form.check_box '_delete' %>
<%= child_form.label '_delete', 'Remove' %>
<% end %>
<% end %>
<%= submit_tag %>
<% end %>
That's all
In order to use this, you have to ensure you're using rails 2 but I'm
sure you are.
Here's more info
http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes
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