If a campaign is done, P2P campaign link is for the nonprofit, not the campaign

app/models/campaign.rb

@@ -164,6 +164,9 @@ class Campaign < ActiveRecord::Base
     (self.end_datetime.to_date - Date.today).to_i
 	end
 
+	def finished?
+		self.end_datetime && self.end_datetime < Time.now
+	end
 
   def child_params
     excluded_for_peer_to_peer = %w(

app/views/campaigns/show.html.erb

@@ -87,7 +87,7 @@
 
     <% if !@campaign.child_campaign? %>
       <aside class='u-marginBottom--15 pastelBox--grey'>
-        <a class='button u-width--full' target='_blank' if-branded='background-color, dark' href='/peer-to-peer?campaign_id=<%= @peer_to_peer_campaign_param %>'>
+        <a class='button u-width--full' target='_blank' if-branded='background-color, dark' href='<%= @campaign.finished? ? "/peer-to-peer?npo_id=#{@nonprofit.id}" : "/peer-to-peer?campaign_id=#{ @peer_to_peer_campaign_param}" %>'>
           Start Your Own Campaign for <%= @nonprofit.name %>
         </a>
       </aside>