Merge branch 'crawler' into 'master'

crawl companies, industries, locations

See merge request !2

Gemfile

@@ -61,3 +61,7 @@ end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+
+##
+gem "nokogiri"
+##

Gemfile.lock

@@ -203,6 +203,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
   mysql2 (>= 0.4.4, < 0.6.0)
+  nokogiri
   puma (~> 3.11)
   rails (~> 5.2.4, >= 5.2.4.3)
   sass-rails (~> 5.0)

app/models/industries_job.rb

-class IndustriesJob < ApplicationRecord
-  belongs_to :job
-  belongs_to :industry
-end

app/models/job.rb

@@ -3,6 +3,7 @@ class Job < ApplicationRecord
   has_many :applied_jobs
   has_many :histories
   has_many :favorites
+  has_many :locations_jobs
   has_many :locations, through: :locations_jobs
   has_and_belongs_to_many :industries
 end

app/models/location.rb

 class Location < ApplicationRecord
+  CITY_VIETNAM_NUMBER = 70
+  has_many :locations_jobs
   has_many :jobs, through: :locations_jobs
 end

db/migrate/20200720041935_add_index_to_company.rb

+class AddIndexToCompany < ActiveRecord::Migration[5.2]
+  def change
+    add_index :companies, :name, unique: true
+  end
+end

db/migrate/20200720075150_change_col_area_to_oversea_in_location.rb

+class ChangeColAreaToOverseaInLocation < ActiveRecord::Migration[5.2]
+  def change
+    remove_column :locations, :area, :string
+    add_column :locations, :oversea, :boolean
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_07_17_014308) do
+ActiveRecord::Schema.define(version: 2020_07_20_075150) do
 
   create_table "applied_jobs", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
     t.bigint "user_id"
@@ -30,6 +30,7 @@ ActiveRecord::Schema.define(version: 2020_07_17_014308) do
     t.string "address"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.index ["name"], name: "index_companies_on_name", unique: true
   end
 
   create_table "favorites", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
@@ -77,10 +78,10 @@ ActiveRecord::Schema.define(version: 2020_07_17_014308) do
   end
 
   create_table "locations", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|
-    t.string "area"
     t.string "city"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.boolean "oversea"
   end
 
   create_table "locations_jobs", options: "ENGINE=InnoDB DEFAULT CHARSET=utf8", force: :cascade do |t|

lib/tasks/crawler.rake

+require "open-uri"
+task crawl_jobs: :environment do
+  job_links = get_job_links(1)
+  crawl_jobs(job_links)
+end
+
+task crawl_industries_locations: :environment do
+  crawl_industries_and_locations
+end
+
+def get_job_links(page)
+  job_links = []
+  page.times do |i|
+    document = Nokogiri::HTML(open("https://careerbuilder.vn/viec-lam/tat-ca-viec-lam-trang-#{i}-vi.html"))
+    jobs_xml = document.xpath('//div/a[@class="job_link"]/@href')
+    jobs_xml.each { |i| job_links << i.value}
+  end
+  job_links
+end
+
+def crawl_company(company_link)
+  begin
+    uri = URI.parse(URI.escape(company_link)) #fix error: uri must be ascii only
+    document = Nokogiri::HTML(open(uri))
+    company_name = document.css(".content .name").text
+    return nil if company_name.empty?
+
+    company = Company.find_by(name: company_name)
+    return company if company.present?
+    
+    puts company_name
+    company_address = document.css(".content p")[1].text
+    company_description = document.css(".main-about-us").css('.content').text
+    company = Company.create!(name: company_name, address: company_address, description: company_description)
+  rescue => exception
+    puts exception
+    return nil
+  end
+end
+
+def crawl_jobs(job_links)
+  job_links.each do |link|
+    crawl_job(link)
+  end
+end
+
+def crawl_job(job_link)
+  begin
+    uri = URI.parse(URI.escape(job_link)) #fix error: uri must be ascii only
+    document = Nokogiri::HTML(open(uri))
+    job_title = document.at_css('.job-desc p.title').text
+    return if job_title.empty?
+
+    job_company_link = document.at_css('.job-desc a.job-company-name')[:href]
+    job_company = crawl_company(job_company_link)
+    return if job_company.nil?
+    
+    job_detail = document.css('.job-detail-content div.detail-box')
+    job_location_name = job_detail[0].css('p a').map{ |val| val.text.strip }
+    job_locations = Location.where(city: job_location_name)
+    job_industry_names = job_detail[1].css('ul li')[1].css('p a').map{ |val| val.text.strip }
+    job_industries = Industry.where(name: job_industry_names)
+    job_salary = job_detail[2].css('ul li')[0].css('p').text.strip
+    job_experience = job_detail[2].css('ul li')[1].css('p').text.strip
+    job_level = job_detail[2].css('ul li')[2].css('p').text.strip
+    job_expiration_date = job_detail[2].css('ul li')[3].css('p').text.strip
+    job_description = document.css('.job-detail-content .detail-row').to_s
+
+    Job.find_or_create_by(title: job_title, company_id: job_company.id) do |job|
+      job.salary = job_salary
+      job.experience = job_experience
+      job.level = job_level
+      job.expiration_date = job_expiration_date
+      job.description = job_description
+      job.industries << job_industries
+      job.locations << job_locations
+    end
+    puts job_title
+  rescue => exception
+    puts exception
+    return exception
+  end
+end
+
+def crawl_industries_and_locations
+  document = Nokogiri::HTML(open('https://careerbuilder.vn/viec-lam/tat-ca-viec-lam-vi.html'))
+  industries_xml = document.css('#industry option')
+  industries = industries_xml.map(&:text)
+  locations_xml = document.css('#location option')
+  locations = locations_xml.map(&:text)
+
+
+  industries.each do |val|
+    Industry.find_or_create_by(name: val)
+  end
+
+  locations.take(Location::CITY_VIETNAM_NUMBER).each do |val|
+    Location.find_or_create_by(city: val) do |location|
+      location.oversea = false
+    end
+  end
+
+  locations.last(locations.count - Location::CITY_VIETNAM_NUMBER).each do |val|
+    Location.find_or_create_by(city: val) do |location|
+      location.oversea = true
+    end
+  end
+end
\ No newline at end of file

test/fixtures/industries_jobs.yml

-# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
-
-one:
-  job: one
-  industry: one
-
-two:
-  job: two
-  industry: two

test/models/industries_job_test.rb

-require 'test_helper'
-
-class IndustriesJobTest < ActiveSupport::TestCase
-  # test "the truth" do
-  #   assert true
-  # end
-end