fix sql call

app/controllers/management/complaints_controller.rb

@@ -2,7 +2,7 @@ class Management::ComplaintsController < ManagementController
   include RepositoriesProxy
   before_action :set_complaint, only: :destroy
   def index
-    @complaints = Complaint.all
+    @complaints = Complaint.includes(:complaint_reason, :complaintable, :user)
 
     @date = params[:period]
     @date_limit  = case @date.to_i