adjust completed action

app/controllers/submit_form_controller.rb

@@ -55,7 +55,7 @@ class SubmitFormController < ApplicationController
   end
 
   def completed
-    @submitter = Submitter.find_by!(slug: params[:submit_form_slug])
+    @submitter = Submitter.completed.find_by!(slug: params[:submit_form_slug])
   end
 
   def success; end

app/models/submitter.rb

@@ -53,6 +53,8 @@ class Submitter < ApplicationRecord
   has_many :document_generation_events, dependent: :destroy
   has_many :submission_events, dependent: :destroy
 
+  scope :completed, -> { where.not(completed_at: nil) }
+
   def status
     if completed_at?
       'completed'