Add `not_featured_by` scope to Tag (#28815)

app/controllers/api/v1/featured_tags/suggestions_controller.rb

@@ -12,10 +12,6 @@ class Api::V1::FeaturedTags::SuggestionsController < Api::BaseController
   private
 
   def set_recently_used_tags
-    @recently_used_tags = Tag.recently_used(current_account).where.not(id: featured_tag_ids).limit(10)
-  end
-
-  def featured_tag_ids
-    current_account.featured_tags.pluck(:tag_id)
+    @recently_used_tags = Tag.suggestions_for_account(current_account).limit(10)
   end
 end

app/controllers/settings/featured_tags_controller.rb

@@ -38,7 +38,7 @@ class Settings::FeaturedTagsController < Settings::BaseController
   end
 
   def set_recently_used_tags
-    @recently_used_tags = Tag.recently_used(current_account).where.not(id: @featured_tags.map(&:id)).limit(10)
+    @recently_used_tags = Tag.suggestions_for_account(current_account).limit(10)
   end
 
   def featured_tag_params

app/models/tag.rb

@@ -53,6 +53,8 @@ class Tag < ApplicationRecord
   scope :listable, -> { where(listable: [true, nil]) }
   scope :trendable, -> { Setting.trendable_by_default ? where(trendable: [true, nil]) : where(trendable: true) }
   scope :not_trendable, -> { where(trendable: false) }
+  scope :suggestions_for_account, ->(account) { recently_used(account).not_featured_by(account) }
+  scope :not_featured_by, ->(account) { where.not(id: account.featured_tags.select(:tag_id)) }
   scope :recently_used, lambda { |account|
                           joins(:statuses)
                             .where(statuses: { id: account.statuses.select(:id).limit(RECENT_STATUS_LIMIT) })

spec/models/tag_spec.rb

@@ -142,6 +142,25 @@ RSpec.describe Tag do
     end
   end
 
+  describe '.not_featured_by' do
+    let!(:account) { Fabricate(:account) }
+    let!(:fun) { Fabricate(:tag, name: 'fun') }
+    let!(:games) { Fabricate(:tag, name: 'games') }
+
+    before do
+      Fabricate :featured_tag, account: account, name: 'games'
+      Fabricate :featured_tag, name: 'fun'
+    end
+
+    it 'returns tags not featured by the account' do
+      results = described_class.not_featured_by(account)
+
+      expect(results)
+        .to include(fun)
+        .and not_include(games)
+    end
+  end
+
   describe '.matches_name' do
     it 'returns tags for multibyte case-insensitive names' do
       upcase_string   = 'abcABCａｂｃＡＢＣやゆよ'