optimize query

app/controllers/api/submitters_controller.rb

@@ -179,10 +179,7 @@ module Api
       submitters = submitters.where(external_id: params[:external_id]) if params[:external_id].present?
       submitters = submitters.where(slug: params[:slug]) if params[:slug].present?
       submitters = submitters.where(submission_id: params[:submission_id]) if params[:submission_id].present?
-
-      if params[:template_id].present?
-        submitters = submitters.joins(:submission).where(submissions: { template_id: params[:template_id] })
-      end
+      submitters = submitters.where(template_id: params[:template_id]) if params[:template_id].present?
 
       maybe_filter_by_completed_at(submitters, params)
     end

lib/submitters/start_form.rb

@@ -65,6 +65,7 @@ module Submitters
       submissions = submissions.where(source:) if source
 
       Submitter
+        .where(template_id: template.id)
         .where(submission: submissions)
         .order(id: :desc)
         .where(declined_at: nil)