Require WikiContent directly so WikiContentJournal is loaded before it's patched.

Error: uninitialized constant MergeWikiVersionsWithJournals::WikiContentJournal

db/migrate/20100804112053_merge_wiki_versions_with_journals.rb

@@ -12,6 +12,8 @@
 # See doc/COPYRIGHT.rdoc for more details.
 #++
 
+require 'wiki_content'
+
 class MergeWikiVersionsWithJournals < ActiveRecord::Migration
   # This is provided here for migrating up after the WikiContent::Version class has been removed
   class WikiContent < ActiveRecord::Base