用户为创建课程，或没有作为教师的课程时，不显示引入我的课程按钮

app/helpers/files_helper.rb

@@ -54,6 +54,17 @@ module FilesHelper
     s.html_safe
   end
 
+  #判断用户是否拥有课程，需用户在该课程中角色为教师
+  def has_course? user
+    result = false
+    user.courses.each do |course|
+      if is_course_teacher(user,course)
+        return true
+      end
+    end
+    result
+  end
+
   # 判断指定的资源时候符合类型
   def isTypeOk(attachment, type, contentType)
     result = false

app/views/files/_course_list.html.erb

@@ -21,7 +21,7 @@
         <%= link_to_attachment file, :download => true,:text => truncate(file.filename,length: 35, omission: '...'), :title => file.filename+"\n"+file.description.to_s, :style => "overflow: hidden; white-space: nowrap;text-overflow: ellipsis;",:class => "c_dblue f_14 f_b f_l" %>
         <% if User.current.logged? %>
           <% if is_course_teacher(User.current,@course) && file.author_id == User.current.id %>
-            <%= link_to "选入我的其他课程",quote_resource_show_course_file_path(@course,file),:class => "f_l re_select",:remote => true %>
+            <%= link_to("选入我的其他课程",quote_resource_show_course_file_path(@course,file),:class => "f_l re_select",:remote => true) if has_course?(User.current) %>
 
             <% if delete_allowed && file.container_id == @course.id && file.container_type == "Course"  %>
               <span id="is_public_<%= file.id %>">
@@ -31,7 +31,7 @@
               <!--  <#%= link_to (file.is_public? ? "公开":"私有"),"javascript:void(0)",:class=>"f_l re_open" %> -->
             <% end %>
           <% else %>
-           <%= link_to "选入我的课程",quote_resource_show_course_file_path(@course,file),:class => "f_l re_select",:remote => true %>
+           <%= link_to("选入我的课程",quote_resource_show_course_file_path(@course,file),:class => "f_l re_select",:remote => true) if has_course?(User.current) %>
           <% end %>
         <% else %>
         <% end %>