FIX: Allow expanding posts when anonymous, add specs

app/models/topic_embed.rb

@@ -137,6 +137,16 @@ class TopicEmbed < ActiveRecord::Base
     # If there is no first paragaph, return the first div (onebox)
     doc.css('div').first
   end
+
+  def self.expanded_for(post)
+    Rails.cache.fetch("embed-topic:#{post.topic_id}", expires_in: 10.minutes) do
+      url = TopicEmbed.where(topic_id: post.topic_id).pluck(:embed_url).first
+      title, body = TopicEmbed.find_remote(url)
+      body << TopicEmbed.imported_from_html(url)
+      body
+    end
+  end
+
 end
 
 # == Schema Information