Simplify `Account.by_recent_status` and `Account.by_recent_sign_in` scopes (#26840)

app/models/account.rb

@@ -127,8 +127,8 @@ class Account < ApplicationRecord
   scope :searchable, -> { without_unapproved.without_suspended.where(moved_to_account_id: nil) }
   scope :discoverable, -> { searchable.without_silenced.where(discoverable: true).left_outer_joins(:account_stat) }
   scope :followable_by, ->(account) { joins(arel_table.join(Follow.arel_table, Arel::Nodes::OuterJoin).on(arel_table[:id].eq(Follow.arel_table[:target_account_id]).and(Follow.arel_table[:account_id].eq(account.id))).join_sources).where(Follow.arel_table[:id].eq(nil)).joins(arel_table.join(FollowRequest.arel_table, Arel::Nodes::OuterJoin).on(arel_table[:id].eq(FollowRequest.arel_table[:target_account_id]).and(FollowRequest.arel_table[:account_id].eq(account.id))).join_sources).where(FollowRequest.arel_table[:id].eq(nil)) }
-  scope :by_recent_status, -> { order(Arel.sql('(case when account_stats.last_status_at is null then 1 else 0 end) asc, account_stats.last_status_at desc, accounts.id desc')) }
-  scope :by_recent_sign_in, -> { order(Arel.sql('(case when users.current_sign_in_at is null then 1 else 0 end) asc, users.current_sign_in_at desc, accounts.id desc')) }
+  scope :by_recent_status, -> { order(Arel.sql('account_stats.last_status_at DESC NULLS LAST')) }
+  scope :by_recent_sign_in, -> { order(Arel.sql('users.current_sign_in_at DESC NULLS LAST')) }
   scope :popular, -> { order('account_stats.followers_count desc') }
   scope :by_domain_and_subdomains, ->(domain) { where(domain: Instance.by_domain_and_subdomains(domain).select(:domain)) }
   scope :not_excluded_by_account, ->(account) { where.not(id: account.excluded_from_timeline_account_ids) }

spec/controllers/api/v1/directories_controller_spec.rb

@@ -55,7 +55,7 @@ describe Api::V1::DirectoriesController do
         Fabricate(:account_domain_block, account: user.account, domain: 'test.example')
       end
 
-      it 'returns only the local discoverable account' do
+      it 'returns the local discoverable account and the remote discoverable account' do
         local_discoverable_account = Fabricate(
           :account,
           domain: nil,
@@ -75,8 +75,7 @@ describe Api::V1::DirectoriesController do
 
         expect(response).to have_http_status(200)
         expect(body_as_json.size).to eq(2)
-        expect(body_as_json.first[:id]).to include(eligible_remote_account.id.to_s)
-        expect(body_as_json.second[:id]).to include(local_discoverable_account.id.to_s)
+        expect(body_as_json.pluck(:id)).to contain_exactly(eligible_remote_account.id.to_s, local_discoverable_account.id.to_s)
       end
     end
 
@@ -97,16 +96,15 @@ describe Api::V1::DirectoriesController do
 
     context 'when ordered by active' do
       it 'returns accounts in order of most recent status activity' do
-        status_old = Fabricate(:status)
-        travel_to 10.seconds.from_now
-        status_new = Fabricate(:status)
+        old_stat = Fabricate(:account_stat, last_status_at: 1.day.ago)
+        new_stat = Fabricate(:account_stat, last_status_at: 1.minute.ago)
 
         get :show, params: { order: 'active' }
 
         expect(response).to have_http_status(200)
         expect(body_as_json.size).to eq(2)
-        expect(body_as_json.first[:id]).to include(status_new.account.id.to_s)
-        expect(body_as_json.second[:id]).to include(status_old.account.id.to_s)
+        expect(body_as_json.first[:id]).to include(new_stat.account_id.to_s)
+        expect(body_as_json.second[:id]).to include(old_stat.account_id.to_s)
       end
     end