「7. 言及している日報を表示する」の差分 / 「8. Railsでテストを書く」のスタート地点

Gemfile

@@ -84,3 +84,4 @@ gem 'carrierwave'
 gem 'devise'
 gem 'devise-i18n'
 gem 'kaminari'
+gem 'rails_autolink'

Gemfile.lock

@@ -218,6 +218,8 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.5.0)
       loofah (~> 2.19, >= 2.19.1)
+    rails_autolink (1.1.7)
+      rails (> 3.1)
     railties (7.0.4.2)
       actionpack (= 7.0.4.2)
       activesupport (= 7.0.4.2)
@@ -323,6 +325,7 @@ DEPENDENCIES
   letter_opener_web
   puma (~> 5.0)
   rails (~> 7.0.4)
+  rails_autolink
   rubocop-fjord
   rubocop-rails
   selenium-webdriver

app/assets/stylesheets/mentions.css

@@ -0,0 +1,40 @@
+/****************
+mentions-container
+****************/
+
+.mentions-container {
+    margin-top: 32px;
+    max-width: var(--single-column-w);
+}
+
+.mentions-container p {
+    font-size: var(--global-fz-md);
+    line-height: 1.8;
+}
+
+.mentions-container ul {
+    margin: 12px 0 0;
+    padding-inline-start: 0;
+    list-style: none;
+}
+
+.mentions-container li {
+    padding-bottom: 12px;
+    font-size: var(--global-fz-md);
+    line-height: 1.8;
+}
+
+.mentions-container li:not(:first-of-type) {
+    border-top: solid var(--global-bw) var(--global-bc-muted);
+    padding-top: 12px;
+}
+
+.mentions-container li:last-of-type {
+    padding-bottom: 0;
+}
+
+.mentions-container li small {
+    display: block;
+    font-size: 12px;
+    margin-top: 8px;
+}

app/models/report.rb

@@ -4,14 +4,32 @@ class Report < ApplicationRecord
   belongs_to :user
   has_many :comments, as: :commentable, dependent: :destroy
 
+  has_many :active_mentions, class_name: 'ReportMention', foreign_key: :mentioned_by_id, dependent: :destroy, inverse_of: :mentioned_by
+  has_many :mentioning_reports, through: :active_mentions, source: :mention_to
+
+  has_many :passive_mentions, class_name: 'ReportMention', foreign_key: :mention_to_id, dependent: :destroy, inverse_of: :mention_to
+  has_many :mentioned_reports, through: :passive_mentions, source: :mentioned_by
+
   validates :title, presence: true
   validates :content, presence: true
 
+  after_save :save_mentions
+
   def editable?(target_user)
     user == target_user
   end
 
   def created_on
     created_at.to_date
   end
+
+  private
+
+  MENTION_REGEXP = %r{http://localhost:3000/reports/(\d+)}
+  def save_mentions
+    active_mentions.destroy_all
+    ids = content.to_s.scan(MENTION_REGEXP).flatten.uniq
+    reports = Report.where(id: ids).where.not(id:)
+    self.mentioning_reports += reports
+  end
 end

app/models/report_mention.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class ReportMention < ApplicationRecord
+  belongs_to :mention_to, class_name: 'Report'
+  belongs_to :mentioned_by, class_name: 'Report'
+
+  validates :mentioned_by_id, uniqueness: { scope: :mention_to_id }
+end

app/views/reports/_mentions.html.erb

@@ -0,0 +1,17 @@
+<div class="mentions-container">
+  <strong><%= t('.title') %>:</strong>
+  <% if mentioned_reports = report.mentioned_reports.includes(mentioned_reports: :user).order(id: :desc).presence %>
+    <ul>
+      <% mentioned_reports.each do |mentioned_report| %>
+        <li>
+          <%= link_to mentioned_report.title, mentioned_report %>
+          <small>
+            (<%= link_to mentioned_report.user.name_or_email, mentioned_report.user %> - <%= l mentioned_report.created_on %>)
+          </small>
+        </li>
+      <% end %>
+    </ul>
+  <% else %>
+    <p>（<%= t('.no_mentions') %>）</p>
+  <% end %>
+</div>

app/views/reports/_report.html.erb

@@ -6,7 +6,7 @@
 
   <p>
     <strong><%= Report.human_attribute_name(:content) %>:</strong>
-    <%= format_content report.content %>
+    <%= auto_link(format_content(report.content)) %>
   </p>
 
   <p>

app/views/reports/show.html.erb

@@ -4,6 +4,8 @@
   <%= render @report %>
 </div>
 
+<%= render 'reports/mentions', report: @report %>
+
 <%= render 'shared/comments', commentable: @report %>
 
 <nav class="page-nav">

config/locales/ja.yml

@@ -216,6 +216,10 @@ ja:
       create: コメントする
       delete: 削除
       no_comments: コメントはまだありません
+  reports:
+    mentions:
+      title: この日報に言及している日報
+      no_mentions: この日報に言及している日報はまだありません
   # devise-i18n-viewsをオーバーライド
   devise:
     registrations:

db/migrate/20230102085641_create_report_mentions.rb

@@ -0,0 +1,11 @@
+class CreateReportMentions < ActiveRecord::Migration[7.0]
+  def change
+    create_table :report_mentions do |t|
+      t.references :mention_to, null: false, foreign_key: { to_table: 'reports' }, index: false
+      t.references :mentioned_by, null: false, foreign_key: { to_table: 'reports' }
+
+      t.timestamps
+    end
+    add_index :report_mentions, %i[mention_to_id mentioned_by_id], unique: true
+  end
+end

db/seeds.rb

@@ -165,4 +165,25 @@ def add_comments_to(commentable, contents)
   end
 end
 
+mention_texts = <<~TEXT.lines(chomp: true)
+  この日報を参考にさせてもらいました。
+  この日報が役に立ちました。
+  昨日こちらの日報を読みました。
+  この日報に書かれている内容が素敵だなと思いました。
+  以下の日報に手順が書いてありました。
+TEXT
+Report.transaction do
+  # 先頭の20件には何らかのメンションをランダムに付ける
+  Report.order(id: :desc).limit(20).each do |report|
+    mention_count = rand(0..5)
+    mentioning_reports = Report.where('id > ?', report.id).to_a.sample(mention_count)
+    mentioning_reports.each do |mentioning_report|
+      mentioning_report.update!(content: <<~CONTENT)
+        #{mention_texts.sample}
+        http://localhost:3000/reports/#{report.id}
+      CONTENT
+    end
+  end
+end
+
 puts '初期データの投入が完了しました。' # rubocop:disable Rails/Output

test/fixtures/report_mentions.yml

@@ -0,0 +1,11 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+# This model initially had no columns defined. If you add columns to the
+# model remove the "{}" from the fixture names and add the columns immediately
+# below each fixture, per the syntax in the comments below
+#
+one: {}
+# column: value
+#
+two: {}
+# column: value

test/models/report_mention_test.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class ReportMentionTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end