update func set language

app/controllers/apply_job_controller.rb

@@ -5,7 +5,7 @@ class ApplyJobController < ApplicationController
   before_action :authenticate_user!
 
   def index
-    @jobs = current_user.applied_jobs.order(created_at: :desc).page(params[:page]).per(6)
+    @jobs = current_user.applied_jobs.includes(:job).order(created_at: :desc).page(params[:page]).per(6)
   end
 
   def apply

app/controllers/users_controller.rb

@@ -10,9 +10,7 @@ class UsersController < ApplicationController
   def my_page; end
 
   def set_lang
-    if user_signed_in? && current_user.language != params[:lang]
-      User.update(current_user.id, language: params[:lang]) if params[:lang] == 'vi' || params[:lang] == 'en'
-    end
+    current_user.update_current_language(params[:lang]) if user_signed_in?
     redirect_to '/'
   end
 end

app/models/user.rb

@@ -4,6 +4,7 @@
 class User < ApplicationRecord
   # Include default devise modules. Others available are:
   # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
+  VALID_LANG_CODES = %w[vi en].freeze
   mount_uploader :cv, CvUploader
   devise :database_authenticatable, :registerable,
          :recoverable, :rememberable, :validatable, :confirmable
@@ -14,4 +15,11 @@ class User < ApplicationRecord
   has_many :favorites
   validates_length_of :name, within: 4..200
   validates_length_of :email, within: 8..200
+
+  def update_current_language(new_lang)
+    return if new_lang == language || VALID_LANG_CODES.exclude?(new_lang)
+
+    self.language = new_lang
+    save
+  end
 end