报错问题

app/controllers/managements_controller.rb

@@ -29,7 +29,8 @@ class ManagementsController < ApplicationController
   end
 
   def user_agents
-    @user_agents = UserAgent.where("user_agents.key is not null and is_delete = 0").order("created_at desc")
+    @user_agents = UserAgent.joins("JOIN users u ON u.login = user_agents.key")
+                       .where("user_agents.key is not null and is_delete = 0").order("created_at desc")
     @agents_count = @user_agents.count
     limit = 20
     @agents_pages = Paginator.new @agents_count, limit, params['page'] || 1

app/views/managements/_user_agent_list.html.erb

@@ -12,7 +12,7 @@
   </thead>
   <tbody>
   <% @user_agents.each do |ua| %>
-    <% user = User.find_by_login(ua.key) %>
+    <% user = User.find_by_login(ua.key)  %>
     <% user_extension = user&.user_extensions %>
     <% school = user_extension&.school %>
     <tr>