修复访问不存在的项目时报500的问题

app/controllers/application_controller.rb

@@ -309,7 +309,7 @@ class ApplicationController < ActionController::Base
 
   # Find project of id params[:id]
   def find_project
-    @project = Project.find_by_id(params[:id])
+    @project = Project.find(params[:id])
   rescue ActiveRecord::RecordNotFound
     render_404
   end