Fix

spec/factories/topic.rb

@@ -1,5 +1,10 @@
 FactoryGirl.define do
   factory :topic do
     sequence(:title) { |n| "Forum Title #{n}" }
+    forum
+    user
+    before(:create) do |topic|
+    	topic.first_post = "My first post on the topic"
+    end
   end
 end

spec/models/user_spec.rb

@@ -19,6 +19,7 @@
 #  time_zone    :string(255)
 #  version      :integer
 #  public_email :boolean          default(FALSE), not null
+#  salt         :string(255)
 #
 
 require 'spec_helper'