diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 7660c0509..c9dc4fa26 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -473,7 +473,11 @@ module ApplicationHelper
   def principals_check_box_tags_ex(name, principals)
     s = ''
     principals.each do |principal|
-      s << "<label>#{ check_box_tag name, principal.id, false, :id => nil } #{h principal.userInfo }</label>\n"
+      if principal.has_attribute?(:userInfo)
+        s << "<label>#{ check_box_tag name, principal.id, false, :id => nil } #{h principal.userInfo }</label>\n"
+      else
+        s << "<label>#{ check_box_tag name, principal.id, false, :id => nil } #{h principal}</label>\n"
+      end
     end
     s.html_safe
   end
diff --git a/app/helpers/welcome_helper.rb b/app/helpers/welcome_helper.rb
index 048933e40..d41e6bd95 100644
--- a/app/helpers/welcome_helper.rb
+++ b/app/helpers/welcome_helper.rb
@@ -182,11 +182,12 @@ module WelcomeHelper
     sort_course_by_hot limit
   end
 
+  # modif by nwb
   def find_all_new_hot_course limit = 9 ,school_id = 0
     #sort_project_by_hot_rails 1, 'course_ac_para DESC', limit
     time_now = Time.new.strftime("%Y");
-    Project.visible.joins(:project_status).where("#{Project.table_name}.project_type = ? and #{Project.table_name}.created_on like '%#{time_now}%' and #{Project.table_name}.identifier not in
-      (select extra from courses where school_id = ?)", 1,school_id).order("course_ac_para DESC").limit(limit).all
+    Course.visible.joins(:course_status).where("#{Course.table_name}.created_at like '%#{time_now}%' and #{Course.table_name}.school_id <>
+       ?", school_id).order("course_ac_para DESC").limit(limit).all
   end
 
   def find_all_hot_bid
diff --git a/app/models/course.rb b/app/models/course.rb
index 51b118679..ff5e4fbd8 100644
--- a/app/models/course.rb
+++ b/app/models/course.rb
@@ -27,6 +27,7 @@ class Course < ActiveRecord::Base
   has_many :boards, :dependent => :destroy, :order => "position ASC"
   #has_many :course_journals_for_messages, :class_name => 'CourseJournalsForMessage', :as => :jour, :dependent => :destroy
   has_many :news, :dependent => :destroy, :include => :author
+  has_one :course_status, :class_name => "CourseStatus", :dependent => :destroy
 
   acts_as_taggable
   acts_as_nested_set :order => 'name', :dependent => :destroy
diff --git a/app/models/repository.rb b/app/models/repository.rb
index bcd3366cb..ce7ac9d0c 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -38,7 +38,7 @@ class Repository < ActiveRecord::Base
 
   validates_length_of :password, :maximum => 255, :allow_nil => true
   validates_length_of :identifier, :maximum => IDENTIFIER_MAX_LENGTH, :allow_blank => true
-  validates_presence_of :identifier, :unless => Proc.new { |r| r.is_default? || r.set_as_default? }
+  validates_presence_of :identifier#, :unless => Proc.new { |r| r.is_default? || r.set_as_default? }
   validates_uniqueness_of :identifier, :scope => :project_id, :allow_blank => true
   validates_exclusion_of :identifier, :in => %w(show entry raw changes annotate diff show stats graph)
   # donwcase letters, digits, dashes, underscores but not digits only
diff --git a/app/views/welcome/course.html.erb b/app/views/welcome/course.html.erb
index ce53924ed..5ec76e4cc 100644
--- a/app/views/welcome/course.html.erb
+++ b/app/views/welcome/course.html.erb
@@ -75,7 +75,7 @@
   <h3><strong>新开课程</strong></h3>
   <% school_course = find_miracle_course(10, 7,params[:school_id]) %>
   <% if(school_course.count == 0) %>
-      <span><%= link_to "更多>>", {:controller => 'projects', :action => 'course', :project_type => 1, :school_id => nil} %></span>
+      <span><%= link_to "更多>>", {:controller => 'courses', :action => 'course', :project_type => 1, :school_id => nil} %></span>
       <div class="d-p-projectlist-box">
         <ul class="d-p-projectlist">
 
diff --git a/config/routes.rb b/config/routes.rb
index 2ed284919..88d2725ba 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -573,6 +573,7 @@ RedmineApp::Application.routes.draw do
     end
   end
 
+  match 'projects/course', :to => 'courses#course', :as => 'course'
   # add by nwb
   # 课程路由设置
   resources :courses do