修改课程退出的权限

app/views/layouts/base_courses.html.erb

@@ -41,9 +41,11 @@
 											<td><%= link_to image_tag(url_to_avatar(@project), :class => 'avatar2') %></td>
 											<td align="center">
 											<div class="info_font" style=" word-wrap: break-word; word-break: break-all">
-												<%=  @project.name %>												
+												<%=  @project.name %>
 											</div>
+											<% unless @course.teacher.id == User.current.id%>
 											<%= join_in_course(@project, User.current)%>
+											<% end %>
 											</td>
 										</tr>
 									</table>												
@@ -82,7 +84,7 @@
 											<tr>
 												<td valign="top" style="padding-left: 8px;">课程学期：</td><td class="font_lighter_sidebar"><%= @course.term %></td>
 											</tr>
-											<% unless @course.teacher.user_extensions.nil?%>											
+											<% unless @course.teacher.user_extensions.nil?%>
 											<tr>
 												<td valign="top" style="padding-left: 8px;">教师单位：</td><td class="font_lighter_sidebar"><%= @course.teacher.user_extensions.occupation %></td>
 											</tr>