1.作业参与人员可以对作业进行修改，但不能进行删除

2.作业成员(发布人员和参与人员)不能对作业进行评分
3.修改进行作业删除、添加、修改、添加成员等方法的权限判断

app/controllers/homework_attach_controller.rb

@@ -35,7 +35,7 @@ class HomeworkAttachController < ApplicationController
 
   #作业添加成员（参与人员）
   def add_homework_users
-    if User.current.admin? || User.current == @homework.user
+    if User.current.admin? ||  User.current.member_of?(@homework.bid.courses.first)
       #@homework = HomeworkAttach.find(params[:id])
       if params[:membership]
         if params[:membership][:user_ids]
@@ -59,7 +59,7 @@ class HomeworkAttachController < ApplicationController
   #作业删除成员（参与人员）
   def destory_homework_users
     #@homework = HomeworkAttach.find(params[:id])
-    if User.current.admin? || User.current == @homework.user
+    if User.current.admin? ||  User.current.member_of?(@homework.bid.courses.first)
       homework_user = @homework.homework_users.where("user_id = #{params[:user_id]}").first
       homework_user.destroy
       get_homework_member @homework
@@ -196,7 +196,7 @@ class HomeworkAttachController < ApplicationController
 
   def destroy
     #@homework = HomeworkAttach.find(params[:id])
-    if User.current.admin? || User.current.member_of?(@homework.bid.courses.first)
+    if User.current.admin? || User.current == @homework
       if @homework.destroy
         respond_to do |format|
           format.html { redirect_to project_for_bid_path @homework.bid }

app/helpers/courses_helper.rb

@@ -177,4 +177,9 @@ module CoursesHelper
     seem_count = homework.rates(:quality).where("rater_id = ?",User.current).count
     seem_count > 0
   end
+
+  #获取指定作业的所有成员
+  def users_for_homework homework
+    homework.nil? ? [] : (homework.users + [homework.user])
+  end
 end

app/views/bids/_homework_list.html.erb

@@ -90,11 +90,13 @@
                             <% end %>
 						</td>
                         <td>
-                          <% if (User.current == homework.user) || is_teacher %>
+                          <% if (users_for_homework(homework).include?(User.current) || is_teacher) %>
                               <%= link_to l(:button_edit), edit_homework_attach_path(homework) %>
+                              <%  if homework.user == User.current || is_teacher %>
                                   <%= link_to(l(:label_bid_respond_delete), homework,
                                               method: :delete, :confirm => l(:text_are_you_sure))  %>
                               <% end %>
+                          <% end %>
                         </td>
 					</tr>
 				</table>

app/views/homework_attach/show.html.erb

@@ -142,7 +142,8 @@
 
 <div class="underline-contests_one"></div>
 
-<% if User.current != @homework.user %>
+<!-- 作业成员(发布人员和参与人员)不能对作业进行评分 -->
+<% if !users_for_homework(@homework).include?(User.current) %>
     <div style="height: 50px">
       <div style="font-size: 15px"><strong>作业评论：</strong></div>
       <% if is_student %>