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copied!<p>Embrace duck-typing and make sure that your objects are <strong>polymorphic</strong>. You want your <em>payment</em> items to be <strong>comparable</strong> with <em>maintenance</em> items, in order to sort them.</p> <p>So, suppose you have a <code>Payment</code> and a <code>Maintenance</code> class:</p> <pre><code>module Due include Comparable # Compare this object with another. Used for sorting. def <=>(other) self.due <=> other.due end end class Payment < ActiveRecord::Base include Due alias_method :due, :payment def action "#{name} requires payment" end end class Maintenance < ActiveRecord::Base include Due alias_method :due, :maintenance def action "#{name} requires maintenance" end end </code></pre> <p>See how we create an <code>action</code>, <code>due</code> and <code><=></code> method in <strong>both</strong> classes? We also took care to include the Ruby built-in module <code>Comparable</code>. This allows us to do the following:</p> <pre><code># Assuming 'payment' and 'maintenance' are date fields... a = Payment.new :payment => 3.days.from_now b = Maintenance.new :maintenance => 2.days.from_now [a, b].sort #=> [b, a] </code></pre> <p>The view then becomes as simple as:</p> <pre><code><% (@payment_items + @maintenance_items).sort.each do |item| %> <%= item.action %> in <%= distance_of_time_in_words_to_now(item.due) %><br/> <% end %> </code></pre> <p>I'm sure I haven't got the details of your implementation right, but I hope this gives you an idea of how to approach your problem.</p>

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