Destroy wiki after its last page has been deactivated and the wiki module has been successfully deactivated...

... This ensures a new menu item is spawned on reactivation of the wiki module. Moreover this is the raw state of a project without enabled wiki module.

app/models/wiki_page.rb

@@ -76,7 +76,7 @@ class WikiPage < ActiveRecord::Base
 
   after_destroy :delete_wiki_menu_item
   after_destroy do |wiki_page|
-    wiki_page.wiki.project.disable_module(:wiki) if is_only_wiki_page?
+    wiki_page.wiki.project.disable_module(:wiki) and wiki_page.wiki.destroy if is_only_wiki_page?
   end
 
   def check_and_mark_as_protected

spec/models/wiki_page_spec.rb

@@ -63,6 +63,10 @@ describe WikiPage do
       it 'deactivates the wiki module' do
         project.module_enabled?(:wiki).should be_false
       end
+
+      it 'destroys the project wiki' do
+        project.wiki.should be_nil
+      end
     end
 
     context 'when one of two wiki pages is destroyed' do
@@ -75,6 +79,10 @@ describe WikiPage do
       it 'does not deactivate the wiki module' do
         project.module_enabled?(:wiki).should be_true
       end
+
+      it 'does not destroy the project wiki' do
+        project.wiki.should be_present
+      end
     end
   end
 end