dlikhten

class Billing < ActiveRecord::Base
  has_many :addresses
  has_many :billing_addresses, :conditions => {:address_type => 'billing'}, :class_name => "Address"
  has_many :mailing_addresses, :conditions => {:address_type => 'mailing'}, :class_name => "Address"
end

dlikhten

<% suffix = [ '_triple', '_dual', '' ] %>
<ul class="profile_info<%= yield :suffix %>">
  <li><%= link_to(fb_name(owner, :use_you => false, :linked => false), owner) %></li>
  <% if local_assigns.include?(:phone) %>
    <li class="phone"><%= phone %></li>
    <% suffix.pop %>
  <%end%>
  <% if local_assigns.include?(:location) %>
    <li><%= location %></li>
    <% suffix.pop %>

dlikhten

<% 
mode    = 0
mode   |= 1 if local_assigns.include?(:phone)
mode   |= 2 if local_assigns.include?(:location)
suffix  = [ '', '_dual', '_dual', '_triple' ][ mode ]
%>
  <ul class="profile_info<%= suffix>">
    <li><%= link_to(fb_name(owner, :use_you => false, :linked => false), owner) %></li>
    <% if mode == 1 %>
    <li><%= location %></li>