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Ruby on Rails モデル内の処理をコンソールだけでデバックする方法

Posted at

こんにちは
今日書くのは主に初心者向けです。
今回はあるデバックの方法を紹介します。そのデバックは'byebug'です。これはbinding.pryみたいなgemは必要とせず、viewが必要としないところは魅力であります。モデルやコントローラーの処理の中にbyebugを書くだけでデバックすることができます。ただしviewに書いてもデバックはできません。

scraping.rb
class Scraping < ApplicationRecord
    def self.get_infomation
        require 'mechanize'
        agent = Mechanize.new
        links = []
        current_page = agent.get("https://talent-dictionary.com/s/jobs/3/20")
        elements = current_page.at('.home_talent_list_wrapper')
        boxs = elements.search('.item')
        roks = boxs.search('.right')
        qqqs = roks.search('a')
        eees = qqqs.search('.title')
        eees.each do |eee|
            links <<  eee.inner_text
        end
        links.each do |link|
            get_personal_infomation('https://talent-dictionary.com/' + link)
        end
    end
    def self.get_personal_infomation(link)
        agent = Mechanize.new
        personal_page = agent.get(link)
        aaas = personal_page.at('.talent_name_wrapper')
        ages = aaas.at('.age').inner_text.delete('歳').to_i if aaas.at('.age')
        names = aaas.at('h1').inner_text  if aaas.at('h1')
        image_urls = personal_page.at('.main_image img').get_attribute('src') if personal_page.at('.main_image img')
        infomation = Infomation.where(name: names).first_or_initialize
        infomation.age = ages
        infomation.image_url = image_urls
        byebug 
        infomation.save
    end
end

そしてコンソールでget_infomationを実行します

[23, 32] in /home/ec2-user/environment/filebook/app/models/scraping.rb
   23:         ages = aaas.at('.age').inner_text.delete('歳').to_i if aaas.at('.age')
   24:         names = aaas.at('h1').inner_text  if aaas.at('h1')
   25:         image_urls = personal_page.at('.main_image img').get_attribute('src') if personal_page.at('.main_image img')
   26:         infomation = Infomation.where(name: names).first_or_initialize
   27:         infomation.age = ages
   28:         infomation.image_url = image_urls
   29:         byebug 
=> 30:         infomation.save
   31:     end
   32: end
(byebug) 

このようにmodel内で処理を止めることができます。この(byebug)にメソッドを書くことでできます。

(byebug) infomation
#<Infomation id: 14, age: 22, name: "広瀬すず", image_url: "https://images.talent-dictionary.com/uploads/image...", created_at: "2020-11-01 07:14:44", updated_at: "2020-11-01 07:14:44">

中身を取り出すことができます。次にinfomation.nameでやると

(byebug) infomation.name
"広瀬すず"

さらにpersonal_pageにすると


personal_page
#<Mechanize::Page
 {url
  #<URI::HTTPS https://talent-dictionary.com/%E5%BA%83%E7%80%AC%E3%81%99%E3%81%9A>}
 {meta_refresh}
 {title "広瀬すずの生い立ちから現在まで - タレント辞書"}
 {iframes
  #<Mechanize::Page::Frame
   nil
   "//www.googletagmanager.com/ns.html?id=GTM-P49Z2S">
  #<Mechanize::Page::Frame nil "https://www.youtube.com/embed/hY0oCSd6G78">}
 {frames}
 {links
  #<Mechanize::Page::Link "タレント辞書" "https://talent-dictionary.com/">
  #<Mechanize::Page::Link "タレント辞書" "https://talent-dictionary.com/">
  #<Mechanize::Page::Link
   "広瀬すず"
   "https://talent-dictionary.com/%E5%BA%83%E7%80%AC%E3%81%99%E3%81%9A">
  #<Mechanize::Page::Link
   ""
   "https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Ftalent-dictionary.com%2F%25E5%25BA%2583%25E7%2580%25AC%25E3%2581%2599%25E3%2581%259A">
  #<Mechanize::Page::Link
   ""
   "https://twitter.com/share?url=h
残りは割愛

viewにある情報を全て抜き取ることができます。

コントローラでも同じようにできます

infomation_controller.rb

def show
        @infomation = Infomation.find(params[:id])
          byebug 
        @comments = @infomation.comments
        @favorite = @infomation.favorites
end

そしてサーバーを起動すると

[3, 12] in /home/ec2-user/environment/filebook/app/controllers/infomations_controller.rb
    3:         @infomations = Infomation.all
    4:         @infomations_rankings = Infomation.find(Favorite.group(:infomation_id).order('count(infomation_id) desc').limit(3).pluck(:infomation_id))
    5:     end
    6:     def show
    7:         @infomation = Infomation.find(params[:id])
    8:           byebug 
=>  9:         @comments = @infomation.comments
   10:         @favorite = @infomation.favorites
   11:     end
   12: end
(byebug)

この状態で@infomationと起動すると

(byebug) @infomation
#<Infomation id: 1, age: 21, name: "橋本環奈", image_url: "https://images.talent-dictionary.com/uploads/image...", created_at: nil, updated_at: nil>

と情報を取得することができます。

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