fix draper

app/decorators/job_decorator.rb

@@ -3,6 +3,7 @@ class JobDecorator < ApplicationDecorator
 
   delegate_all
   decorates_association :city
+  decorates_association :user
 
   def city_name
     object.cities&.first&.name
@@ -19,4 +20,8 @@ class JobDecorator < ApplicationDecorator
   def display_description
     simple_format object.description
   end
+
+  def apply_available(user)
+    object.users.find_by(id: user.id)
+  end
 end

app/decorators/user_decorator.rb

+class UserDecorator < ApplicationDecorator
+  include ActionView::Helpers::TextHelper
+
+  delegate_all
+  decorates_association :jobs
+
+  def apply_available
+    object.jobs.find_by(job_id: jobs.id)
+  end
+end

app/views/jobs/show.html.erb

@@ -32,7 +32,7 @@
 
 <div class="job_detail_button">
   <%= link_to "Favorite", "#", class: "btn btn-primary float-right" %>
-  <% if user_signed_in? && UserJob.find_by(user_id: current_user.id, job_id: @job.id) %>
+  <% if user_signed_in? && @job.apply_available(current_user) %>
     <button type="button" class="btn btn-primary float-right mx-3" disabled>Apply</button>
   <% else %>
     <%= link_to "Apply", apply_path(job_id: @job.id), class: "btn btn-primary float-right mx-3" %>