gistfile1.erb

<%= form_for(@organization) do |f| %>
    <% if @organization.errors.any? %>
        <div id="error_explanation">
            <h2><%= pluralize(@organization.errors.count, "error") %> prohibited this organization from being saved:</h2>

            <ul>
                <% @organization.errors.full_messages.each do |message| %>
                    <li><%= message %></li>
                <% end %>
            </ul>
        </div>
    <% end %>

    <div class="field">
        <%= f.label :name %><br>
        <%= f.text_field :name ,:class => "form-control"%>
    </div>
    <div class="field">
        <%= f.label :organization_type %><br>
        <%= f.select :organization_type, %w[Partner Provider] %>
    </div>
    <%= ContactType.all.each do |ct| %>
    <%= f.fields_for :contacts, @organization.contacts.find_or_initialize_by(contact_type_id: ct.id) do |c| %>
        <fieldset>
            <%# collection_select foreign key for contact_type, collection, primary key for collection, value column for collection, options %>
            <%= c.collection_select(:contact_type_id, ContactType.all, :id, :contactType, prompt: true) %>
            <%= c.text_field :value %>
        </fieldset>
    <% end %>
<% end %>
<div class="actions">
    <%= f.submit :class =>  "button round" %>
</div>
<% end %>