修复: 代码溯源pdf只需下载一次

app/controllers/traces/projects_controller.rb

@@ -69,12 +69,18 @@ class Traces::ProjectsController < Traces::BaseController
 
 
   def task_pdf 
-    return render_error("task_id错误") if params[:task_id].blank?
-    result = Trace::PdfReportService.call(current_user.trace_token, params[:task_id])
-    if result.is_a?(Hash) && result[:code] == 200
-      redirect_to result[:download_url]
+    task_id =  params[:task_id]
+    return render_error("task_id错误") if task_id.blank?
+    file_save_path = "public/trace_task_results/#{task_id}/report.pdf" 
+    if File.exists?(file_save_path)
+      redirect_to "/trace_task_results/#{task_id}/report.pdf"
     else 
-      render_error("下载报告失败！")
+      result = Trace::PdfReportService.call(current_user.trace_token, task_id)
+      if result.is_a?(Hash) && result[:code] == 200
+        redirect_to result[:download_url]
+      else 
+        render_error("下载报告失败！")
+      end
     end
   rescue Exception => exception 
     puts exception.message