keep value input if validation error

app/assets/stylesheets/common.scss

@@ -40,4 +40,4 @@ background-color: $main-color;
       display: none;
     }
   }
-}
\ No newline at end of file
+}

app/controllers/applied_jobs_controller.rb

@@ -12,8 +12,8 @@ class AppliedJobsController < ApplicationController
     @applied_job = current_user.applied_jobs.new(applied_job_params)
     @applied_job.curriculum_vitae = current_user.curriculum_vitae if params[:applied_job][:curriculum_vitae].nil?
     if @applied_job.invalid?
-      flash[:error] = @applied_job.errors.full_messages
-      redirect_to new_applied_job_path(job_id: @applied_job.job_id)
+      flash.now[:error] = @applied_job.errors.full_messages
+      render :new
     end
   end
 

config/environment.rb

 # Load the Rails application.
 require_relative 'application'
 
+# disable auto add field_with_errors class
+ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
+  html_tag.html_safe
+end
+
 # Initialize the Rails application.
 Rails.application.initialize!