using before_action find_user

app/controllers/jobs_controller.rb

 class JobsController < ApplicationController
   before_action :authenticate_user!, only: [:apply, :confirm_apply, :finish_apply]
+  before_action :find_user, only: :apply_available
 
   def index
     if params[:city_id]
@@ -41,9 +42,17 @@ class JobsController < ApplicationController
     end
   end
 
+  def apply_available
+    user_jobs.find_by(job_id: @job_id, user_id: @user.id)
+  end
+
   private
 
   def confirm_apply_info_params
     params.require(:confirm_apply_info).permit(:job_id, :first_name, :last_name, :email)
   end
+
+  def find_user
+    @user = User.fint_by(:id)
+  end
 end

app/models/job.rb

@@ -43,9 +43,4 @@ class Job < ApplicationRecord
   def self.latest_job
     @latest_job ||= order(updated_at: :desc).take(Settings.top.job.limit)
   end
-
-  def apply_available
-    user = User.find_by(:id)
-    user_jobs.find_by(job_id: @job_id, user_id: user.id)
-  end
 end