项目里程碑点击列表报500、里程碑编辑删除、项目成员删除编辑不可用

app/controllers/application_controller.rb

@@ -474,11 +474,12 @@ class ApplicationController < ActionController::Base
     render_404 unless @object.present?
 
     @project = @object.project
-    if @project == nil && !@object.course_id.nil?
+    if @project == nil && @object.has_attribute?('course_id')
       @course = @object.course
-    else
+      if @course.nil? && @object.has_attribute?('contest_id')
         @contest = @object.contest
       end
+    end
 
   end