カテゴリ別のフィルタリング方法...スコープまたは別の方法ですか？

Question

カテゴリを使用してエントリをフィルタリングするにはどうすればよいですか？

私は、教育的目的のためにredditを題材にしており、タイトル、リンク、カテゴリのみを削っています。ここで

は、libディレクトリを経由して、それのためのコードです：

require 'open-uri' 

module RedditScrapper 
    def self.scrape 
    doc = Nokogiri::HTML(open("https://www.reddit.com/")) 

    entries = doc.css('.entry') 
    entries.each do |entry| 
     title = entry.css('p.title > a').text 
     link = entry.css('p.title > a')[0]['href'] 
     category = entry.css('p.tagline > a.subreddit')[0]['href'] 
     Entry.create!(title: title, link: link, category: category) 
    end 
    end 

end 

はindex.html.erbではなく、どのように損失でこれをフィルタリングしようとしています。

私は以前に書いたことがないのに、スコープを試してみることに決めました。ここで

は Entryモデル

class Entry < ApplicationRecord 

    validates :title, presence: true 
    validates :link, presence: true 
    validates :category, presence: true 

    scope :categorization, -> (category) { where category: category } 

end 

内のスコープは述べ、このエラーメッセージが表示されentries_controller

class EntriesController < ApplicationController 


def index 
    @entries = Entry.all 
    @entries = @entries.categorization 
end 

def scrape 

    RedditScrapper.scrape 

    respond_to do |format| 
     format.html { redirect_to entries_url, notice: 'Entries were successfully scraped.' } 
     format.json { entriesArray.to_json } 
    end 
    end 

end 

にindexアクションにスコープを入れてあります。

ArgumentError in EntriesController#index 
wrong number of arguments (given 0, expected 1) 

を、それが参照してい範囲に。

これを解決するにはどうすればよいですか、スコープではなく別の方法がある場合は、カテゴリ別にフィルタリングしてください。

ありがとうございます。追加データが必要な場合はお知らせください。あなたがここにスコープを必要としない出力の

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/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

LPT: if you're in a bad mood or something has annoyed you, be as kind as you can to the next 3 people you encounter. By not reacting to the bad mood, as well as helping others, you'll feel miles better. 

/r/LifeProTips/comments/5zf0l2/lpt_if_youre_in_a_bad_mood_or_something_has/ 

Answer 1

、彼らはwhere句をクリーンアップするためのものです。

{ 
    "category1" => [Entry,Entry,Entry], 
    "category2" => [Entry], 
    ... 
} 

は、あなたのビューであなたが

<% @entries.each do |category, entries| %> 
    <h1><%= category %></h1> 
    <% entries.each do |entry| %> 
    <p><%= entry.inspect %></p> 
    <% end %> 
<% end %> 

あなたの第二の問題は、スクレーパーで重複を処理していないことができます：

だけ group_by

このようなハッシュを作成します

def index 
    @entries = Entry.all.group_by{ |entry| entry.category } 
    # a shorter more ruby way of writing this is: 
    # @entries = Entry.all.group_by(&:category) 
end 

を使用

変更：

Entry.create!(title: title, link: link, category: category) 

：

Entry.where(title: title, link: link, category: category).first_or_create