Change: 絵文字リアクションの通知のグループ化で、アカウントを絵文字の種類ごとに表示 (#796)

* Change: 絵文字リアクションの通知のグループ化で、アカウントを絵文字の種類ごとに表示

* Fix lint

* アカウントの一括取得数を制限

* ストリーミング対応

* Fix

* Fix

* Fix

* Fix some problems

* Fix

spec/models/notification_group_spec.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe NotificationGroup do
+  subject { described_class.from_notification(notification) }
+
+  context 'when emoji reaction notifications' do
+    let(:target_status)  { Fabricate(:status) }
+    let(:alice)          { Fabricate(:account) }
+    let(:bob)            { Fabricate(:account) }
+    let(:ohagi)          { Fabricate(:account) }
+    let(:custom_emoji)   { Fabricate(:custom_emoji) }
+    let(:emoji_reaction) { Fabricate(:emoji_reaction, account: alice, status: target_status, name: custom_emoji.shortcode, custom_emoji: custom_emoji) }
+    let(:notification)   { Fabricate(:notification, account: target_status.account, activity: emoji_reaction, group_key: group_key) }
+    let(:group_key)      { 5 }
+
+    it 'with single emoji_reaction' do
+      group = subject.emoji_reaction_groups.first
+
+      expect(group).to_not be_nil
+      expect(group.emoji_reaction.id).to eq emoji_reaction.id
+      expect(group.sample_accounts.map(&:id)).to contain_exactly(alice.id)
+    end
+
+    it 'with multiple reactions' do
+      second = Fabricate(:emoji_reaction, account: bob, status: target_status, name: custom_emoji.shortcode, custom_emoji: custom_emoji)
+      Fabricate(:notification, account: target_status.account, activity: second, group_key: group_key)
+
+      group = subject.emoji_reaction_groups.first
+
+      expect(group).to_not be_nil
+      expect([emoji_reaction.id, second.id]).to include group.emoji_reaction.id
+      expect(group.sample_accounts.map(&:id)).to contain_exactly(alice.id, bob.id)
+    end
+
+    it 'with multiple reactions and multiple emojis' do
+      second = Fabricate(:emoji_reaction, account: bob, status: target_status, name: custom_emoji.shortcode, custom_emoji: custom_emoji)
+      Fabricate(:notification, account: target_status.account, activity: second, group_key: group_key)
+      third = Fabricate(:emoji_reaction, account: ohagi, status: target_status, name: '😀')
+      Fabricate(:notification, account: target_status.account, activity: third, group_key: group_key)
+
+      group = subject.emoji_reaction_groups.find { |g| g.emoji_reaction.name == custom_emoji.shortcode }
+      second_group = subject.emoji_reaction_groups.find { |g| g.emoji_reaction.name == '😀' }
+
+      expect(group).to_not be_nil
+      expect([emoji_reaction.id, second.id]).to include group.emoji_reaction.id
+      expect(group.sample_accounts.map(&:id)).to contain_exactly(alice.id, bob.id)
+
+      expect(second_group).to_not be_nil
+      expect(third.id).to eq second_group.emoji_reaction.id
+      expect(second_group.sample_accounts.map(&:id)).to contain_exactly(ohagi.id)
+    end
+  end
+end