[#467] Fix Journal#journaled to prevent uninitialized constant Journal::Journaled

app/models/journal.rb

@@ -23,7 +23,12 @@ class Journal < ActiveRecord::Base
 
   # Make sure each journaled model instance only has unique version ids
   validates_uniqueness_of :version, :scope => [:journaled_id, :type]
-  belongs_to :journaled, :touch => true
+
+  # Define a default class_name to prevent `uninitialized constant Journal::Journaled`
+  # subclasses will be given an actual class name when they are created by aaj
+  #
+  #  e.g. IssueJournal will get :class_name => 'Issue'
+  belongs_to :journaled, :touch => true, :class_name => 'Journal'
   belongs_to :user
 
   # ActiveRecord::Base#changes is an existing method, so before serializing the +changes+ column,

test/unit/journal_test.rb

@@ -94,4 +94,11 @@ class JournalTest < ActiveSupport::TestCase
 
     assert_not_equal start, @issue.reload.updated_on
   end
+
+  test "accessing #journaled on a Journal should not error (parent class)" do
+    journal = Journal.new
+    assert_nothing_raised do
+      assert_equal nil, journal.journaled
+    end
+  end
 end