管理员登陆报错

app/views/layouts/base_users_new.html.erb

@@ -149,7 +149,7 @@
             <div class="subNav">
               <a href="<%=url_for(:controller => 'users', :action => 'user_resource',:id=>@user.id,:type=>1)%>" class=" f14 c_blue02">
                 我的资源库
-                <span style="font-weight:normal;font-size:12px;color:#FF5722;">(<%=Attachment.where("(author_id = #{@user.id} and container_type in('Project','Principal','Course','Issue','Document','Message','News','StudentWorkScore','HomewCommon')) or (container_type = 'Course'  and container_id in (#{@user.courses.map{|c| c.id}.join(',')}))").count%>)</span>
+                <span style="font-weight:normal;font-size:12px;color:#FF5722;">(<%=Attachment.where("(author_id = #{@user.id} and container_type in('Project','Principal','Course','Issue','Document','Message','News','StudentWorkScore','HomewCommon')) or (container_type = 'Course'  and container_id in (#{@user.courses.map{|c| c.id}.empty? ? '0' : @user.courses.map{|c| c.id}.join(',')}))").count%>)</span>
               </a>
             </div>