use vue for form submission

app/controllers/send_submission_email_controller.rb

@@ -4,18 +4,23 @@ class SendSubmissionEmailController < ApplicationController
   layout 'flow'
 
   skip_before_action :authenticate_user!
+  skip_before_action :verify_authenticity_token
 
   def success; end
 
   def create
-    @submission = if params[:flow_slug]
-                    Submission.joins(:flow).find_by!(email: params[:email], flow: { slug: params[:flow_slug] })
-                  else
-                    Submission.find_by!(slug: params[:submission_slug])
-                  end
+    @submission =
+      if params[:flow_slug]
+        Submission.joins(:flow).find_by!(email: params[:email], flow: { slug: params[:flow_slug] })
+      else
+        Submission.find_by!(slug: params[:submission_slug])
+      end
 
     SubmissionMailer.copy_to_submitter(@submission).deliver_later!
 
-    redirect_to success_send_submission_email_index_path
+    respond_to do |f|
+      f.html { redirect_to success_send_submission_email_index_path }
+      f.json { head :ok }
+    end
   end
 end

app/controllers/submit_flow_controller.rb

@@ -14,7 +14,7 @@ class SubmitFlowController < ApplicationController
 
   def update
     submission = Submission.find_by!(slug: params[:slug])
-    submission.values.merge!(params[:values].to_unsafe_h)
+    submission.values.merge!(normalized_values)
     submission.completed_at = Time.current if params[:completed] == 'true'
 
     submission.save
@@ -25,4 +25,10 @@ class SubmitFlowController < ApplicationController
   def completed
     @submission = Submission.find_by!(slug: params[:submit_flow_slug])
   end
+
+  private
+
+  def normalized_values
+    params[:values].to_unsafe_h.transform_values { |v| v.is_a?(Array) ? v.compact_blank : v }
+  end
 end