修复：rake任务

lib/tasks/upgrade_issue_generate_data.rake

@@ -8,9 +8,9 @@ namespace :upgrade_issue_generate_data do
   task project_issues_index: :environment do
     puts "____________fix start________________"
 
-    Issue.update_all(project_issues_index: nil)
+    Issue.issue_issue.update_all(project_issues_index: nil)
     count = 0
-    Issue.where(project_issues_index: nil).group(:project_id).count.each do |pid, count| 
+    Issue.issue_issue.where(project_issues_index: nil).group(:project_id).count.each do |pid, count| 
       p = Project.find_by_id(pid)
       issues = p.issues.order(created_on: :asc)
       issues.find_each.with_index do |issue, index|