fixed review

app/assets/stylesheets/cities.scss

-// Place all the styles related to the Cities controller here.
-// They will automatically be included in application.css.
-// You can use Sass (SCSS) here: https://sass-lang.com/

app/assets/stylesheets/industries.scss

-// Place all the styles related to the Industries controller here.
-// They will automatically be included in application.css.
-// You can use Sass (SCSS) here: https://sass-lang.com/

app/assets/stylesheets/jobs.scss

-// Place all the styles related to the Jobs controller here.
-// They will automatically be included in application.css.
-// You can use Sass (SCSS) here: https://sass-lang.com/

app/assets/stylesheets/top.scss

-// Place all the styles related to the Top controller here.
-// They will automatically be included in application.css.
-// You can use Sass (SCSS) here: https://sass-lang.com/

app/controllers/application_controller.rb

 class ApplicationController < ActionController::Base
-  
 end

app/controllers/cities_controller.rb

 class CitiesController < ApplicationController
   def index
-    @region_job_list = City.jobs_count
-  end
-
-  def show
+    @regions = City.regions.keys
+    @job_quantity_by_region = City.job_quantity_by_region
   end
 end

app/controllers/industries_controller.rb

 class IndustriesController < ApplicationController
   def index
-    # @industries_job_list = Industry.joins(:jobs).group(:name).count.sort_by(&:first)
-    @industries_job_list = Industry.jobs_count
-  end
-  def show
+    @job_quantity_by_industry = Industry.job_quantity_by_industry
   end
 end

app/controllers/jobs_controller.rb

 class JobsController < ApplicationController
   def index
-    if params[:city_slug].present?
-      city = City.find_by(slug: params[:city_slug])
-      @name = city.name
-      @jobs = city.jobs
-    elsif params[:industry_slug].present?
-      industry = Industry.find_by(slug: params[:industry_slug])
-      @name = industry.name
-      @jobs = industry.jobs
+    if job_params.present?
+      search
     else
-      @name = 'JOBS'
-      @jobs = Job.all
+      @jobs = Job.page(params[:page]).per(20)
     end
-    @jobs = @jobs.page(params[:page]).per(20)
   end
 
   def show
     @job = Job.find(params[:id])
   end
+
+  private
+
+  def search 
+    if job_params.key?(:model) && job_params.key?(:slug) # search by model
+      model = params[:model].classify.constantize
+      @target = model.find_by(slug: job_params[:slug])
+      @jobs = @target.jobs.page(params[:page]).per(20)
+    elsif job_params.key?(:search)                      # search by keywords
+      wildcard_search = "%#{job_params[:search]}%"
+      @jobs = Job.where('name ILIKE ? OR postal_code LIKE ?', wildcard_search, wildcard_search)
+                 .page(params[:page]).per(Job::JOB_PER_PAGE)
+    end
+  end
+
+  def job_params
+    params.permit(:model, :slug, :search)
+  end
 end

app/helpers/industries_helper.rb

-module IndustriesHelper
-end

app/helpers/jobs_helper.rb

-module JobsHelper
-end

app/models/city.rb

 class City < ApplicationRecord
-  scope :jobs_count, -> { joins(:jobs).group(:region).count }
+  TOP_JOB_COUNT = 9
 
-  has_and_belongs_to_many :jobs
   enum region: { vietnam: 0, international: 1 }
 
+  has_and_belongs_to_many :jobs
+
   validates :slug, presence: true, uniqueness: { case_sensitive: true }
 
-  def to_params
-    slug
+  def self.top_jobs
+    joins(:jobs).select('cities.*, count(jobs.id) as job_count')
+                .group('cities.id').order('job_count desc').limit(TOP_JOB_COUNT)
   end
 
-  def add_slugs
-    update slug: to_slug(name)
+  def self.job_quantity_by_region
+    regions.each_with_object({}) do |(name, _), hash|
+      hash[name.to_sym] = send(name).joins(:jobs).group(:name, :slug)
+                                    .order('COUNT(jobs.id) DESC').count
     end
-
-  def self.top_jobs
-    self.all.map { |city| [city, city.jobs.count] }.sort_by(&:second).reverse.take(9)
   end
 end

app/models/industry.rb

 class Industry < ApplicationRecord
   scope :jobs_count, -> { joins(:jobs).group(:name).count.sort_by(&:first) }
 
+  TOP_JOB_COUNT = 9
+
   has_and_belongs_to_many :jobs
 
   validates :slug, presence: true, uniqueness: { case_sensitive: true }
 
-  # before_validation :add_slugs
-
-  def to_params
-    slug
-  end
-
-  def add_slugs
-    update slug: to_slug(name)
+  def self.top_jobs
+    joins(:jobs).select('industries.*, count(jobs.id) as job_count')
+                .group('industries.id').order('job_count desc').limit(TOP_JOB_COUNT)
   end
 
-  def self.top_jobs
-    self.all.map { |industry| [industry, industry.jobs.count] }.sort_by(&:second).reverse.take(9)
+  def self.job_quantity_by_industry
+    Industry.joins(:jobs).group(:name, :slug).order('COUNT(jobs.id) DESC').count
   end
 end

app/models/job.rb

 class Job < ApplicationRecord
-  scope :latest, -> { order(updated_at: :desc).limit(5).joins(:cities).includes(:company, :cities, :cities_jobs) }
+  LATEST_JOBS_LIMIT = 5
 
   has_and_belongs_to_many :industries
   has_and_belongs_to_many :cities
@@ -7,4 +7,8 @@ class Job < ApplicationRecord
   has_many :apply_jobs, dependent: :destroy
   has_many :favorite_jobs, dependent: :destroy
   has_many :history_job, dependent: :destroy
+
+  def self.latest
+    joins(:cities).includes(:cities, :cities_jobs, :company).order(created_at: :desc).limit(LATEST_JOBS_LIMIT)
+  end
 end

app/views/cities/_cities_list.html.slim

-.cities-list
-  .container 
-    - @region_job_list.each do |region, job_count|
-      .countries-job-list id=region 
-        .container-fullwidth.py-5
-          h2.mt-0
-            = region
-            small.text-muted
-              |  (#{pluralize(job_count, "job")})
-            hr.my-4
-          .row
-            - list = get_cities_list(region)
-            - list.each do |city, count|
-              .col-lg-4.col-md-6.text-center
-                .mt-5
-                  .city-item
-                    h3.h4.mb-2.see-more-text= link_to city, city_jobs_path(City.find_by(name: city).slug) , class:'text-decoration-none fw-normal text-reset'
-                    p.text-muted.mb-0= pluralize(count, "job")
\ No newline at end of file

app/views/cities/_regions_list.html.slim

-.countries-list
-  .container.py-5
-    h2.mt-0 REGION
-    hr.my-4
-    .row
-      - @region_job_list.each do |region, job_count|
-        .col-lg-4.col-md-6.text-center
-          .mt-5
-            h3.h4.mb-2.text-white.see-more-text= link_to region, anchor: region
-            p.text-muted.mb-0= pluralize(job_count, "job")

app/views/cities/index.html.slim

-= render 'regions_list'
-= render 'cities_list'
\ No newline at end of file
+/region
+.countries-list
+  .container.py-5
+    h2.mt-0 REGION
+    hr.my-4
+    .row
+      - @regions.each do |region|
+        .col-lg-4.col-md-6.text-center
+          .mt-5
+            h3.h4.mb-2.text-white.see-more-text= link_to region, anchor: region
+// cities list
+.cities-list
+  .container 
+    - @job_quantity_by_region.each do |region, city_job_count|
+      .countries-job-list id=region 
+        .container-fullwidth.py-5
+          h2.mt-0
+            = region
+            hr.my-4
+          .row
+            - city_job_count.each do |city, count|
+              .col-lg-4.col-md-6.text-center
+                .mt-5
+                  .city-item
+                    h3.h4.mb-2.see-more-text= link_to city[0], job_list_path(model: :city, slug: city[1]) , class:'text-decoration-none fw-normal text-reset'
+                    p.text-muted.mb-0= pluralize(count, "job")
\ No newline at end of file

app/views/industries/index.html.slim

@@ -3,10 +3,10 @@
     h2.mt-0 INDUSTRIES
     hr.my-4
     #info-box.row
-      - @industries_job_list.each do |name, job_count|
+      - @job_quantity_by_industry.each do |name, job_count|
         .col-lg-6.col-md-6.text-center
           .mt-5
-            h3.h4.mb-2.see-more-text= link_to name, industry_jobs_path(Industry.find_by(name: name).slug) , class:'text-decoration-none fw-normal text-reset'
+            h3.h4.mb-2.see-more-text= link_to name[0], job_list_path(model: :industry, slug: name[1]) , class:'text-decoration-none fw-normal text-reset'
             p.text-muted.mb-0= pluralize(job_count, "job")
             hr.divider.my-4
 

app/views/jobs/_breadcrumb.html.slim

@@ -5,14 +5,14 @@
       |  >  
     - city_list = @job.cities
     - city_list.each_with_index do |city, i|
-      = link_to city_jobs_path(city.slug), class: 'text-decoration-none text-info' do
+      = link_to job_list_path(model: :city, slug: city.slug), class: 'text-decoration-none text-info' do
         = city.name
       = " | " if i != city_list.length - 1
     span.d-block.mx-2
       |   >  
     - industry_list = @job.industries
     - industry_list.each_with_index do |industry, i|
-      = link_to industry_jobs_path(industry.slug), class: 'text-decoration-none text-info' do
+      = link_to job_list_path(model: :industry, slug: industry.slug), class: 'text-decoration-none text-info' do
         = industry.name
       = " | " if i != industry_list.length - 1
     span.d-block.mx-2

app/views/jobs/index.html.slim

 - provide(:title, 'Job list page')
-= render 'search'
+= render 'shared/search'
 .container
   h1.mt-5
     = @name

app/views/top/_latest_jobs.html.slim

-.latest-job.mb-5
-  .container.mb-5
-    h2
-      | Latest jobs
-    hr.my-2
-    - @latest_jobs.each do |job|
-      .job-item.mb-4
-        = link_to job.title, job_path(Job.find_by(title: job.title).id), class: "job-title"
-        .job-caption
-          = link_to job.company.name, "#", class: "job-company"
-          p.job-salary
-            | Salary: 
-            = job.salary
-          .job-locations
-            ul
-              - job.cities.each do |city|
-                li
-                  = city.name
-          .job-desc
-            = truncate(simple_format(job.description), escape: false, length: 250)
-      hr.my-2

app/views/top/_top_cities.html.slim

-.top_cities.mb-5
-  .container
-    h2 Top cities
-    hr.my-2
-    .row.align-items-start.mb-3
-      - @top_cities.each do |city, city_jobs|
-        .col-4.city-item
-          = link_to city.name, city_jobs_path(City.find_by(name: city.name).slug), class: 'city-name'
-          span.job-count
-            |  (
-            = pluralize(city_jobs, "job") 
-            |)
-    = link_to 'See all cities', cities_path, class:'all-cities-btn'
\ No newline at end of file

app/views/top/_top_industries.html.slim

-.top_industries.mb-5
-  .container
-    h2 Top industries
-    hr.my-2
-    .row.align-items-start
-      - @top_industries.each do |industry, industry_jobs|
-        .col-4.industry-item
-          = link_to industry.name, industry_jobs_path(Industry.find_by(name: industry.name).slug), class: 'industry-name'
-          span.job-count
-            |  (
-            = pluralize(industry_jobs, "job") 
-            |)
-    = link_to 'See all industries', industries_path, class:'all-industries-btn'
\ No newline at end of file

app/views/top/index.html.slim

 - provide(:title, 'Home page')
-= render 'search'
-= render 'latest_jobs'
-= render 'top_cities'
-= render 'top_industries'
+/ search box
+= render 'shared/search'
+/ latest job
+.latest-job.mb-5
+  .container.mb-5
+    h2
+      | Latest jobs
+    hr.my-2
+    - @latest_jobs.each do |job|
+      .job-item.mb-4
+        = link_to job.title, job_path(job.id), class: "job-title"
+        .job-caption
+          = link_to job.company.name, "#", class: "job-company"
+          p.job-salary
+            | Salary: 
+            = job.salary
+          .job-locations
+            ul
+              - job.cities.each do |city|
+                li
+                  = city.name
+          .job-desc
+            = truncate(simple_format(job.description), escape: false, length: 250)
+      hr.my-2
+/ top cities
+.top_cities.mb-5
+  .container
+    h2 Top cities
+    hr.my-2
+    .row.align-items-start.mb-3
+      - @top_cities.each do |city, city_jobs|
+        .col-4.city-item
+          = link_to city.name, job_list_path(model: :city, slug: city.slug), class: 'city-name'
+          span.job-count
+            |  (
+            = pluralize(city_jobs, "job") 
+            |)
+    = link_to 'See all cities', cities_path, class:'all-cities-btn'
+/ top industries
+.top_industries.mb-5
+  .container
+    h2 Top industries
+    hr.my-2
+    .row.align-items-start
+      - @top_industries.each do |industry, industry_jobs|
+        .col-4.industry-item
+          = link_to industry.name, job_list_path(model: :industry, slug: industry.slug), class: 'industry-name'
+          span.job-count
+            |  (
+            = pluralize(industry_jobs, "job") 
+            |)
+    = link_to 'See all industries', industries_path, class:'all-industries-btn'
\ No newline at end of file

config/initializers/string.rb

 class String
   def to_slug
-    source = [
-      'à', 'á', 'â', 'ã', 'è', 'é', 'ê', 'ì', 'í', 'ò',
-      'ó', 'ô', 'õ', 'ù', 'ú', 'ý', 'ă', 'đ', 'ĩ', 'ũ',
-      'ơ', 'ư', 'ạ', 'ả', 'ấ', 'ầ', 'ẩ', 'ẫ', 'ậ', 'ắ',
-      'ằ', 'ẳ', 'ẵ', 'ặ', 'ẹ', 'ẻ', 'ẽ', 'ế', 'ề', 'ể',
-      'ễ', 'ệ', 'ỉ', 'ị', 'ọ', 'ỏ', 'ố', 'ồ', 'ổ', 'ỗ',
-      'ộ', 'ớ', 'ờ', 'ở', 'ỡ', 'ợ', 'ụ', 'ủ', 'ứ', 'ừ',
-      'ử', 'ữ', 'ự', 'ỳ', 'ỷ', 'ỹ', 'ỵ'
-    ]
-    destination = [
-      'a', 'a', 'a', 'a', 'e', 'e', 'e', 'i', 'i', 'o',
-      'o', 'o', 'o', 'u', 'u', 'y', 'a', 'd', 'i', 'u',
-      'o', 'u', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a',
-      'a', 'a', 'a', 'a', 'e', 'e', 'e', 'e', 'e', 'e',
-      'e', 'e', 'i', 'i', 'o', 'o', 'o', 'o', 'o', 'o',
-      'o', 'o', 'o', 'o', 'o', 'o', 'u', 'u', 'u', 'u',
-      'u', 'u', 'u', 'y', 'y', 'y', 'y'
-    ]
+    source = %w[
+      à á â ã è é ê ì í ò ó ô õ ù ú ý ă đ ĩ ũ ơ ư ạ ả ấ ầ ẩ ẫ ậ ắ ằ ẳ ẵ ặ
+      ẹ ẻ ẽ ế ề ể ễ ệ ỉ ị ọ ỏ ố ồ ổ ỗ ộ ớ ờ ở ỡ ợ ụ ủ ứ ừ ử ữ ự ỳ ỷ ỹ ỵ
+    ].freeze
+    destination = %w[
+      a a a a e e e i i o o o o u u y a d i u o u a a a a a a a a a a a a
+      e e e e e e e e i i o o o o o o o o o o o o u u u u u u u y y y y
+    ].freeze
     hash = Hash[source.zip destination]
-    self.downcase.encode('ASCII', 'UTF-8', fallback: hash).gsub(' ', '-').parameterize.truncate 80
+    downcase.encode('ASCII', 'UTF-8', fallback: hash).gsub(' ', '-').parameterize
   end
 end

config/routes.rb

 Rails.application.routes.draw do
   root 'top#index'
 
-  resources :cities, param: :slug, only: %i[index show] do
-    resources :jobs, only: %i[index]
-  end
-  resources :industries, param: :slug, only: %i[index show] do
-    resources :jobs, only: %i[index]
-  end
+  resources :cities, only: %i[index]
+  resources :industries, only: %i[index]
+  get '/jobs/:model/:slug', to: 'jobs#index', as: :job_list
 
   resources :jobs, only: %i[index show]
 end