use session to keep value when back form

app/controllers/applies_controller.rb

@@ -2,14 +2,22 @@ class AppliesController < ApplicationController
   before_action :load_job, only: %i[new confirm create]
 
   def new
-    @apply = current_user.apply_jobs.build
+    @apply = if request.referer.include?('confirm') && session[:apply_job].present?
+               ApplyJob.new(session[:apply_job])
+             else
+               current_user.apply_jobs.build
+             end
   end
 
   def confirm
     @apply = current_user.apply_jobs.build(apply_params)
     @apply.job = @job
 
-    render 'new' if @apply.invalid?
+    if @apply.valid?
+      session[:apply_job] = @apply
+    else
+      render 'new'
+    end
   end
 
   def create
@@ -23,6 +31,7 @@ class AppliesController < ApplicationController
     else
       render 'new'
     end
+    session[:apply_job] = nil
   end
 
   private

app/javascript/packs/application.js

@@ -15,4 +15,4 @@ ActiveStorage.start()
 import "bootstrap"
 window.bootstrap = require("bootstrap");
 import "../stylesheets/application.scss";
-
+import "./validation";

app/views/applies/confirm.html.slim

@@ -34,7 +34,7 @@
           span.form-control
             = url_for(@apply.cv)        
       
-          = link_to 'Edit', apply_path(job_id: @job.id), class: 'btn btn-secondary w-25 btn-height mr-5 my-5'
+          = link_to 'Edit', :back, class: 'btn btn-secondary w-25 btn-height mr-5 my-5'
 
           = f.submit 'Confirm', class: 'btn btn-primary w-25 btn-height mx-5 my-5'
         

app/views/applies/new.html.slim

@@ -14,13 +14,13 @@
         .col-2
           = f.label :user_name, 'Full name', class: 'form-label label'
         .col-10
-          = f.text_field :user_name, value: @current_user.name, class: 'form-control'
+          = f.text_field :user_name, value: @apply.user_name ||= @current_user.name, class: 'form-control'
           span.form-msg
       .row.mb-5.form-group
         .col-2 
           = f.label :email, class: 'form-label label'
         .col-10
-          = f.text_field :email, value: @current_user.email, class: 'form-control'
+          = f.text_field :email, value: @apply.email ||= @current_user.email, class: 'form-control'
           span.form-msg
       .row.mb-5
         / - if @user.cv.attached?
@@ -31,8 +31,7 @@
           = f.file_field :cv, accept: ApplyJob::ACCEPT_CONTENT_TYPE, class: 'form-control'
           = f.submit 'Confirm', class: 'btn btn-primary w-25 my-4 btn-height'
 
-/ = render 'validate_form'
-= javascript_pack_tag 'validation'
+= render 'validate_form'
 javascript:
   Validator({
         form: '#apply-form',