组织域名500问题

app/controllers/org_subfields_controller.rb

@@ -56,7 +56,7 @@ class OrgSubfieldsController < ApplicationController
       @org_subfield = OrgSubfield.find_by_sql("select distinct org_subfields.* from org_subfields,"+
                                                   "subfield_subdomain_dirs where org_subfields.id = subfield_subdomain_dirs.org_subfield_id and "+
                                                   " org_subfields.organization_id=#{@organization.id} and subfield_subdomain_dirs.name='#{params[:sub_dir_name]}'").first
-      if @org_subfield.field_type == 'Post'
+      if @org_subfield.try(:field_type) == 'Post'
         @org_subfield_ids = @org_subfield.org_document_comments.map(&:id) << 0
         @org_activities = OrgActivity.where("(org_act_type='OrgDocumentComment'and org_act_id in (#{@org_subfield_ids.join(",")})) || (container_type='OrgSubfield' and container_id=#{@org_subfield.id})").order('updated_at desc').page(params[:page] || 1).per(10)
         #redirect_to organization_path(@organization, :org_subfield_id => @org_subfield.id)