修复：last index 获取方式

app/models/project.rb

@@ -426,7 +426,7 @@ class Project < ApplicationRecord
   end
 
   def get_last_project_issues_index
-    last_issue = self.issues.last 
+    last_issue = self.issues.issue_issue.last 
     deleted_issue_count = ($redis_cache.hget("issue_cache_delete_count", self.id) || 0).to_i
 
     last_issue&.project_issues_index.present? ? last_issue.project_issues_index + deleted_issue_count : 0