Cache inbox and notification counters

app/helpers/application_helper.rb

@@ -4,30 +4,6 @@ module ApplicationHelper
   include ApplicationHelper::GraphMethods
   include ApplicationHelper::TitleMethods
 
-  def inbox_count
-    return 0 unless user_signed_in?
-
-    count = Inbox.select("COUNT(id) AS count")
-                 .where(new: true)
-                 .where(user_id: current_user.id)
-                 .group(:user_id)
-                 .order(:count)
-                 .first
-    return nil if count.nil?
-    return nil unless count.count.positive?
-
-    count.count
-  end
-
-  def notification_count
-    return 0 unless user_signed_in?
-
-    count = Notification.for(current_user).where(new: true).count
-    return nil unless count.positive?
-
-    count
-  end
-
   def privileged?(user)
     !current_user.nil? && ((current_user == user) || current_user.mod?)
   end

app/models/inbox.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class Inbox < ApplicationRecord
-  belongs_to :user
+  belongs_to :user, touch: :inbox_updated_at
   belongs_to :question
 
   attr_accessor :returning
@@ -29,7 +29,6 @@ class Inbox < ApplicationRecord
 
   def as_push_notification
     {
-      type:  :inbox,
       title: I18n.t(
         "frontend.push_notifications.inbox.title",
         user: if question.author_is_anonymous
@@ -39,7 +38,10 @@ class Inbox < ApplicationRecord
               end
       ),
       icon:  question.author_is_anonymous ? "/icons/maskable_icon_x128.png" : question.user.profile_picture.url(:small),
-      body:  question.content.truncate(Question::SHORT_QUESTION_MAX_LENGTH)
+      body:  question.content.truncate(Question::SHORT_QUESTION_MAX_LENGTH),
+      data:  {
+        click_url: "/inbox",
+      }
     }
   end
 end

app/models/notification.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class Notification < ApplicationRecord
-  belongs_to :recipient, class_name: "User"
+  belongs_to :recipient, class_name: "User", touch: :notifications_updated_at
   belongs_to :target, polymorphic: true
 
   class << self

app/models/user.rb

@@ -8,6 +8,7 @@ class User < ApplicationRecord # rubocop:disable Metrics/ClassLength
   include User::AnswerMethods
   include User::BanMethods
   include User::InboxMethods
+  include User::NotificationMethods
   include User::QuestionMethods
   include User::PushNotificationMethods
   include User::ReactionMethods

app/models/user/inbox_methods.rb

@@ -12,4 +12,21 @@ module User::InboxMethods
       .order(:created_at)
       .reverse_order
   end
+
+  def unread_inbox_count
+    Rails.cache.fetch("#{inbox_cache_key}/unread_inbox_count") do
+      count = Inbox.select("COUNT(id) AS count")
+                   .where(new: true)
+                   .where(user_id: id)
+                   .group(:user_id)
+                   .order(:count)
+                   .first
+      return nil if count.nil?
+      return nil unless count.count.positive?
+
+      count.count
+    end
+  end
+
+  def inbox_cache_key = "#{cache_key}-#{inbox_updated_at}"
 end

app/models/user/notification_methods.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module User::NotificationMethods
+  def unread_notification_count
+    Rails.cache.fetch("#{notification_cache_key}/unread_notification_count") do
+      count = Notification.for(self).where(new: true).count
+      return nil unless count.positive?
+
+      count
+    end
+  end
+
+  def notification_cache_key = "#{cache_key}-#{notifications_updated_at}"
+end

app/views/navigation/_main.html.haml

@@ -1,6 +1,8 @@
 - notifications = Notification.for(current_user).where(new: true).includes([:target]).limit(4)
-= render 'navigation/desktop', notifications: notifications
-= render 'navigation/mobile', notifications: notifications
+- inbox_count = current_user.unread_inbox_count
+- notification_count = current_user.unread_notification_count
+= render 'navigation/desktop', notifications:, inbox_count:, notification_count:
+= render 'navigation/mobile', inbox_count:, notification_count:
 
 = render 'modal/ask'
 %button.btn.btn-primary.btn-fab.d-block.d-lg-none.d-print-none{ data: { bs_target: "#modal-ask-followers", bs_toggle: :modal }, type: "button" }

db/migrate/20230225143633_add_notification_and_inbox_timestamps_to_users.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class AddNotificationAndInboxTimestampsToUsers < ActiveRecord::Migration[6.1]
+  def change
+    change_table :users, bulk: true do |t|
+      t.timestamp :notifications_updated_at
+      t.timestamp :inbox_updated_at
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2023_02_18_142952) do
+ActiveRecord::Schema.define(version: 2023_02_25_143633) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -364,6 +364,8 @@ ActiveRecord::Schema.define(version: 2023_02_18_142952) do
     t.boolean "sharing_enabled", default: false
     t.boolean "sharing_autoclose", default: false
     t.string "sharing_custom_url"
+    t.datetime "notifications_updated_at"
+    t.datetime "inbox_updated_at"
     t.index ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true
     t.index ["email"], name: "index_users_on_email", unique: true
     t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true