增减功能《课程分班模块添加当分班中没有学生时，可以删除该分班》

Signed-off-by: alan <547533434@qq.com>

app/controllers/courses_controller.rb

@@ -226,6 +226,16 @@ class CoursesController < ApplicationController
     @course_groups = @course.course_groups
   end
 
+  def deletegroup
+    CourseGroup.delete(params[:group_id])
+    @subPage_title = l :label_student_list
+    @canShowCode = isCourseTeacher(User.current.id,@course) && params[:role] != '1'
+    @is_remote = true
+    @members = searchStudent(@course)
+    @membercount = @members.count
+    @course_groups = @course.course_groups
+  end
+
   def updategroupname
     @subPage_title = l :label_student_list
     if params[:group_name]

app/views/courses/_groups_name.html.erb

@@ -48,6 +48,13 @@
       <li class="classbox" id="group_name_<%= group.id %>" name="check_group_name">
         <%= link_to group_display, searchgroupmembers_course_path(@course,:group_id => group.id), method: 'get', remote: true,
                     :onclick => "checkclass('group_name_#{group.id}')",:style => " border:0px; color: #0d90c3; float:left;"%>
+        <% if @canShowCode && group.members.count == 0 %>
+            <%= link_to '', deletegroup_course_path(:group_id => group.id), :method => 'delete', :remote => true,
+                        :data => {confirm: l(:label_delete_group)},
+                        :class => 'f_1',
+                        :style => "width: 16px;height: 21px;margin-top:3px;margin-left:5px;background: url(/images/pic_del.gif) no-repeat 0 0;"
+            %>
+        <% end %>
         <% if @canShowCode %>
         <a href="javascript:void(0)" class="f_l" onclick="$('#add_tag_<%= group.id %>').slideToggle();"><img src="/images/pic_edit.png" width="14" height="15" alt="编辑班级" /></a>
         <% end %>

app/views/courses/deletegroup.js.erb

@@ -0,0 +1 @@
+$("#st_groups").html("<%= escape_javascript(  render :partial => 'groups_name', locals: {:course_groups => @course_groups})%>");

config/locales/zh.yml

@@ -572,6 +572,7 @@ zh:
   label_member: 成员
   label_search_member_count: 共搜索到
   label_member_people: 人
+  label_delete_group: 确定删除分班？
   label_current_group: 当前分班
   label_limit_groupname: 组别名不能超出20字符
   label_limit_groupname_null: 组别名不能为空

config/routes.rb

@@ -647,6 +647,7 @@ RedmineApp::Application.routes.draw do
       match "searchgroupmembers", :via => [:post, :get]
       match "updategroupname", :via => [:post, :get]
       match "addgroups",  :via => [:post, :get]
+      match 'deletegroup', :via => [:delete]
       post 'join_in/join_group', :to => 'courses#join_group', :as => 'join_group'
       delete 'join_in/join_group', :to => 'courses#unjoin_group'
     end