Fix “Authorized applications” inefficiently and incorrectly getting last use date (#25060)

app/controllers/oauth/authorized_applications_controller.rb

@@ -8,6 +8,8 @@ class Oauth::AuthorizedApplicationsController < Doorkeeper::AuthorizedApplicatio
   before_action :require_not_suspended!, only: :destroy
   before_action :set_body_classes
 
+  before_action :set_last_used_at_by_app, only: :index, unless: -> { request.format == :json }
+
   skip_before_action :require_functional!
 
   include Localized
@@ -30,4 +32,14 @@ class Oauth::AuthorizedApplicationsController < Doorkeeper::AuthorizedApplicatio
   def require_not_suspended!
     forbidden if current_account.suspended?
   end
+
+  def set_last_used_at_by_app
+    @last_used_at_by_app = Doorkeeper::AccessToken
+                           .select('DISTINCT ON (application_id) application_id, last_used_at')
+                           .where(resource_owner_id: current_resource_owner.id)
+                           .where.not(last_used_at: nil)
+                           .order(application_id: :desc, last_used_at: :desc)
+                           .pluck(:application_id, :last_used_at)
+                           .to_h
+  end
 end

app/lib/application_extension.rb

@@ -9,10 +9,6 @@ module ApplicationExtension
     validates :redirect_uri, length: { maximum: 2_000 }
   end
 
-  def most_recently_used_access_token
-    @most_recently_used_access_token ||= access_tokens.where.not(last_used_at: nil).order(last_used_at: :desc).first
-  end
-
   def confirmation_redirect_uri
     redirect_uri.lines.first.strip
   end

app/views/oauth/authorized_applications/index.html.haml

@@ -18,8 +18,8 @@
 
       .announcements-list__item__action-bar
         .announcements-list__item__meta
-          - if application.most_recently_used_access_token
-            = t('doorkeeper.authorized_applications.index.last_used_at', date: l(application.most_recently_used_access_token.last_used_at.to_date))
+          - if @last_used_at_by_app[application.id]
+            = t('doorkeeper.authorized_applications.index.last_used_at', date: l(@last_used_at_by_app[application.id].to_date))
           - else
             = t('doorkeeper.authorized_applications.index.never_used')