fixed 谭 domain bug in development environment.

app/helpers/application_helper.rb

@@ -1500,7 +1500,7 @@ module ApplicationHelper
   end
 
   def render_dynamic_nav
-    home_link = link_to l(:field_homepage), "http://"+Setting.forge_domain+":3000"
+    home_link = link_to l(:field_homepage), Setting.forge_domain.nil? ? nil : "http://"+Setting.forge_domain+":3000"
     course_all_course_link = link_to l(:label_course_all), {:controller => 'projects', :action => 'course', :project_type => 1,}
     course_teacher_all_link = link_to l(:label_teacher_all), {:controller => 'users', :action => 'index', :role => 'teacher'}
     courses_link = link_to l(:label_course_practice), {:host=>Setting.course_domain}

app/models/setting.rb

@@ -162,6 +162,13 @@ class Setting < ActiveRecord::Base
     logger.info "Settings cache cleared." if logger
   end
 
+  # fixed domain url in development. tantantan's bug
+  if Rails.env.development?
+    methods.map do |m|
+      define_singleton_method m do; nil; end if m.to_s =~ /([a-zA-Z]+_domain)$/
+    end
+  end
+
 private
   # Returns the Setting instance for the setting named name
   # (record found in database or new record with default value)