install gem settinglogic and delete the unnecessary files

Gemfile

@@ -20,6 +20,7 @@ gem 'figaro'
 gem 'devise'
 gem 'carrierwave'
 gem 'kaminari'
+gem "settingslogic"
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console

Gemfile.lock

@@ -141,6 +141,7 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    settingslogic (2.0.9)
     spring (2.0.2)
       activesupport (>= 4.2)
     spring-watcher-listen (2.0.1)
@@ -185,6 +186,7 @@ DEPENDENCIES
   puma (~> 3.7)
   rails (~> 5.1.4)
   sass-rails (~> 5.0)
+  settingslogic
   spring
   spring-watcher-listen (~> 2.0.0)
   tzinfo-data

app/controllers/jobs_controller.rb

 class JobsController < ApplicationController
   before_action :set_job, only: [:show]
   def index
-    @jobs = Job.includes(:company).order(updated_date: :desc).limit(5)
-    @cities = City.top_cities
+    @jobs = Job.top_list.includes(:company)
+    @cities = City.top_cities.includes(:country)
     @industries = Industry.top_industries
   end
 
@@ -11,21 +11,21 @@ class JobsController < ApplicationController
 
   def city
     city = City.find(params[:city_id])
-    @jobs = city.jobs.includes(:company).page(params[:page]).per(20)
+    @jobs = city.jobs.includes(:company).page(params[:page]).per(Settings.pagination.job_per_page)
     @result = "jobs/City/#{city.name}"
     render template: "jobs/job_lists"
   end
 
   def industry
     industry = Industry.find(params[:industry_id])
-    @jobs = industry.jobs.includes(:company).page(params[:page]).per(20)
+    @jobs = industry.jobs.includes(:company).page(params[:page]).per(Settings.pagination.job_per_page)
     @result = "jobs/Industry/#{industry.name}"
     render template: "jobs/job_lists"
   end
 
   def company
     company = Company.find(params[:company_id])
-    @jobs = company.jobs.page(params[:page]).per(20)
+    @jobs = company.jobs.page(params[:page]).per(Settings.pagination.job_per_page)
     @result = "jobs/Company/#{company.name}"
     render template: "jobs/job_lists"
   end

app/models/city.rb

@@ -4,13 +4,12 @@ class City < ApplicationRecord
   has_many :cities_jobs
   has_many :jobs, through: :cities_jobs
 
-  scope :top_cities, -> { have_at_least_one_job.
+  scope :top_cities, -> { availble_job.
                           order(jobs_count: :desc).
-                          limit(9) }
+                          limit(Settings.top.city_per_page) }
 
-  scope :city_list, -> { includes(:country).
-                         have_at_least_one_job.
+  scope :city_list, -> { availble_job.
                          order(jobs_count: :desc, name: :asc) }
 
-  scope :have_at_least_one_job, -> { where('jobs_count > 0')}
+  scope :availble_job, -> { where('jobs_count > 0')}
 end

app/models/industry.rb

@@ -2,12 +2,12 @@ class Industry < ApplicationRecord
   has_many :industries_jobs
   has_many :jobs, through: :industries_jobs
 
-  scope :top_industries, -> { have_at_least_one_job.
+  scope :top_industries, -> { availble_job.
                               order(jobs_count: :desc, name: :asc).
-                              limit(9) }
+                              limit(Settings.top.industry_per_page) }
 
-  scope :industry_list, -> { have_at_least_one_job.
+  scope :industry_list, -> { availble_job.
                              order(jobs_count: :desc) }
 
-  scope :have_at_least_one_job, -> { where('jobs_count > 0')}
+  scope :availble_job, -> { where('jobs_count > 0')}
 end

app/models/job.rb

@@ -9,6 +9,8 @@ class Job < ApplicationRecord
   has_many :cities_jobs
   has_many :cities, through: :cities_jobs
 
+  scope :top_list, -> { order(updated_date: :desc).limit(Settings.top.job_per_page) }
+
   def self.create_new_jobs(arr_jobs)
     arr_jobs.each do |item|
       city_names = []

app/models/settings.rb

+class Settings < Settingslogic
+  source "#{Rails.root}/config/application.yml"
+  namespace Rails.env
+end

vendor/assets/javascripts/npm.js

-// This file is autogenerated via the `commonjs` Grunt task. You can require() this file in a CommonJS environment.
-require('../../js/transition.js')
-require('../../js/alert.js')
-require('../../js/button.js')
-require('../../js/carousel.js')
-require('../../js/collapse.js')
-require('../../js/dropdown.js')
-require('../../js/modal.js')
-require('../../js/tooltip.js')
-require('../../js/popover.js')
-require('../../js/scrollspy.js')
-require('../../js/tab.js')
-require('../../js/affix.js')
\ No newline at end of file