move Constant Variable to model, append relationship

app/controllers/cities_controller.rb

 class CitiesController < ApplicationController
-  VIETNAM = 1
-  FOREIGN = 0
   def index
-    @cities_vietnam = City.location(VIETNAM)
-    @cities_international = City.location(FOREIGN)
+    @cities_vietnam = City.location(City::VIETNAM)
+    @cities_international = City.location(City::FOREIGN)
   end
 end

app/models/city.rb

@@ -2,6 +2,9 @@ class City < ApplicationRecord
   has_many :city_jobs
   has_many :jobs, through: :city_jobs
 
+  VIETNAM = 1
+  FOREIGN = 0
+
   scope :top_city, -> { joins(:jobs).group(:city_id).order('count(job_id) DESC').limit(9) }
   scope :location, ->(number) { joins(:jobs).group(:city_id).order('count(job_id) DESC').where(location: number) }
 end

app/models/job.rb

@@ -15,7 +15,7 @@ class Job < ApplicationRecord
   has_many :histories
   has_many :users, through: :histories
 
-  scope :limit_job, -> { limit(5).order(created_at: :desc) }
+  scope :limit_job, -> { includes(:cities, :company).order(created_at: :desc).limit(5) }
   scope :all_job, -> { limit(20).order(created_at: :desc) }
 
   def company_name

lib/src/crawler.rb

@@ -45,9 +45,7 @@ class Crawler
     cities_relationship = City.where(name: location_relationship)
     city_job_relationship = CityJob.where(job_id: job.id ,city_id: cities_relationship.ids)
 
-    if city_job_relationship.blank?
-      job.cities << cities_relationship
-    end
+    job.cities << cities_relationship if city_job_relationship.blank?
   end
 
   def industry_relationship(row, job)
@@ -55,9 +53,7 @@ class Crawler
     industries_relationship = Industry.where(name: industry_relationship)
     industry_job_relationship = IndustryJob.where(job_id: job.id, industry_id: industries_relationship.ids)
 
-    if industry_job_relationship.blank?
-      job.industries << industries_relationship
-    end
+    job.industries << industries_relationship if industry_job_relationship.blank?
   end
 
   def create_job(title, link_page, row, company)