修复：排序字段失效

app/services/api/pm/sprint_issues/list_service.rb

@@ -20,6 +20,8 @@ class Api::Pm::SprintIssues::ListService < ApplicationService
     @priority_id = params[:priority_id]
     @status_id = params[:status_id]
     @keyword = params[:keyword]
+    @sort_by = params[:sort_by].present? ?  params[:sort_by] : 'issues.updated_on'
+    @sort_direction = (params[:sort_direction].present? ? params[:sort_direction] : 'desc').downcase
     @current_user = current_user
   end