using 1 import file

app/services/cities.rb

-require "csv"
-require "activerecord-import"
-# require "activerecord -import/active_record/adapters/mysql_adapter"
-
-class CityImport
-  def cities
-    cities = []
-    columns = [:name, :region]
-
-    CSV.foreach(Rails.root.join("lib", "jobss.csv"), headers: true) do |row|
-      cities << {name: row["company province"], region: "Việt Nam"}
-    end
-
-    City.import columns, cities, on_duplicate_key_ignore: true
-  end
-end
\ No newline at end of file

app/services/companies.rb

-require "csv"
-require "activerecord-import"
-# require "activerecord -import/active_record/adapters/mysql_adapter"
-
-class CompanyImport
-  def companies
-    companies = []
-    columns = [:name, :email, :address, :company_code]
-
-    CSV.foreach(Rails.root.join("lib", "jobss.csv"), headers: true) do |row|
-      companies << {name: row["company name"], email: row["contact email"],
-                    address: row["company address"], code: row["company id"]}
-    end
-
-    Company.import columns, companies, on_duplicate_key_ignore: true
-  end
-end

app/services/jobs.rb → app/services/import.rb

@@ -2,19 +2,33 @@ require "csv"
 require "activerecord-import"
 # require "activerecord -import/active_record/adapters/mysql_adapter"
 
-class JobImport
-  def jobs
+class Import
+  def import
+    cities = []
+    companies = []
+    industries = []
     jobs = []
-    columns = [:title, :level, :salary, :description, :short_des, :requirement,
+
+    city_columns = [:name, :region]
+    company_columns = [:name, :email, :address, :code]
+    industry_columns = [:name]
+    job_columns = [:title, :level, :salary, :description, :short_des, :requirement,
       :category, :company_id]
 
     CSV.foreach(Rails.root.join("lib", "jobss.csv"), headers: true) do |row|
+      cities << {name: row["company province"], region: "Việt Nam"}
+      companies << {name: row["company name"], email: row["contact email"],
+        address: row["company address"], code: row["company id"]}
+      industries << {name: row["category"]}
       jobs << {title: row["name"], level: row["level"], salary: row["salary"],
         description: row["description"], short_des: row["benefit"],
         requirement: row["requirement"], category: row["type"],
         company_id: Company.find_by(code: row["company id"])&.id}
     end
 
-    Job.import columns, jobs
+    City.import city_columns, cities, on_duplicate_key_ignore: true
+    Company.import company_columns, companies, on_duplicate_key_ignore: true
+    Industry.import industry_columns, industries, on_duplicate_key_ignore: true
+    Job.import job_columns, jobs
   end
 end

app/services/industries.rb

-require "csv"
-require "activerecord-import"
-# require "activerecord -import/active_record/adapters/mysql_adapter"
-
-class IndustryImport
-  def industries
-    industries = []
-    columns = [:name]
-
-    CSV.foreach(Rails.root.join("lib", "jobss.csv"), headers: true) do |row|
-      industries << {name: row["category"]}
-    end
-
-    Industry.import columns, industries, on_duplicate_key_ignore: true
-  end
-end

app/views/companies/index.html.erb

@@ -13,7 +13,7 @@
         <td><%= company.name %></td>
         <td><%= company.email %></td>
         <td><%= company.address %></td>
-        <td><%= company.company_code %></td>
+        <td><%= company.code %></td>
       </tr>
     <% end %>
   </tbody>

lib/tasks/task.rake

-require "./app/services/cities.rb"
-require "./app/services/industries.rb"
-require "./app/services/companies.rb"
-require "./app/services/jobs.rb"
+require "./app/services/import.rb"
 
 namespace :task do
   desc "import data"
   task import: :environment do
-    CityImport.new.cities
-    CompanyImport.new.companies
-    IndustryImport.new.industries
-    JobImport.new.jobs
+    Import.new.import
   end
 end