edit setting.yml

app/controllers/cities_controller.rb

 class CitiesController < ApplicationController
   def index
-    @cities = City.page(params[:page]).per(Settings.col.page.per)
+    @cities = City.page(params[:page]).per(Settings.city.per_page)
   end
 end

app/controllers/jobs_controller.rb

 class JobsController < ApplicationController
   def index
-    @jobs = Job.page(params[:page]).per(Settings.table.page.per)
+    @jobs = Job.page(params[:page]).per(Settings.job.per_page)
   end
 end

app/controllers/static_pages_controller.rb

 class StaticPagesController < ApplicationController
   def index
-    @cities = City.page(params[:page]).per(Settings.col.page.per)
+    @cities = City.page(params[:page]).per(Settings.city.per_page)
     @industries  = Industry.all
-    @jobs = Job.page(params[:page]).per(Settings.table.page.per)
+    @jobs = Job.page(params[:page]).per(Settings.job.per_page)
   end
 end

config/settings.yml

-table:
-  page:
-    per: 5
+job:
+  per_page: 5
 
-col:
-  page:
-    per: 12
+city:
+  per_page: 12