Cache personal projects count.

Closes #37462.

app/models/user.rb

@@ -700,10 +700,6 @@ class User < ActiveRecord::Base
     projects_limit - personal_projects_count
   end
 
-  def personal_projects_count
-    @personal_projects_count ||= personal_projects.count
-  end
-
   def recent_push(project = nil)
     service = Users::LastPushEventService.new(self)
 
@@ -1046,6 +1042,18 @@ class User < ActiveRecord::Base
     end
   end
 
+  def personal_projects_count(force: false)
+    Rails.cache.fetch(['users', id, 'personal_projects_count'], force: force, expires_in: 24.hours, raw: true) do
+      personal_projects.count
+    end.to_i
+  end
+
+  def update_cache_counts
+    assigned_open_merge_requests_count(force: true)
+    assigned_open_issues_count(force: true)
+    personal_projects_count(force: true)
+  end
+
   def update_todos_count_cache
     todos_done_count(force: true)
     todos_pending_count(force: true)
@@ -1056,6 +1064,7 @@ class User < ActiveRecord::Base
     invalidate_merge_request_cache_counts
     invalidate_todos_done_count
     invalidate_todos_pending_count
+    invalidate_personal_projects_count
   end
 
   def invalidate_issue_cache_counts
@@ -1074,6 +1083,10 @@ class User < ActiveRecord::Base
     Rails.cache.delete(['users', id, 'todos_pending_count'])
   end
 
+  def invalidate_personal_projects_count
+    Rails.cache.delete(['users', id, 'personal_projects_count'])
+  end
+
   # This is copied from Devise::Models::Lockable#valid_for_authentication?, as our auth
   # flow means we don't call that automatically (and can't conveniently do so).
   #

app/services/projects/create_service.rb

@@ -96,6 +96,8 @@ module Projects
       system_hook_service.execute_hooks_for(@project, :create)
 
       setup_authorizations
+
+      current_user.invalidate_personal_projects_count
     end
 
     # Refresh the current user's authorizations inline (so they can access the

app/services/projects/destroy_service.rb

@@ -34,6 +34,8 @@ module Projects
       system_hook_service.execute_hooks_for(project, :destroy)
       log_info("Project \"#{project.full_path}\" was removed")
 
+      current_user.invalidate_personal_projects_count
+
       true
     rescue => error
       attempt_rollback(project, error.message)

app/services/projects/transfer_service.rb

@@ -24,6 +24,8 @@ module Projects
 
       transfer(project)
 
+      current_user.invalidate_personal_projects_count
+
       true
     rescue Projects::TransferService::TransferError => ex
       project.reload

changelogs/unreleased/ab-37462-cache-personal-projects-count.yml

@@ -0,0 +1,5 @@
+---
+title: Cache personal projects count.
+merge_request: 18197
+author:
+type: performance

spec/models/user_spec.rb

@@ -2234,6 +2234,20 @@ describe User do
     end
   end
 
+  context '#invalidate_personal_projects_count' do
+    let(:user) { build_stubbed(:user) }
+
+    it 'invalidates cache for personal projects counter' do
+      cache_mock = double
+
+      expect(cache_mock).to receive(:delete).with(['users', user.id, 'personal_projects_count'])
+
+      allow(Rails).to receive(:cache).and_return(cache_mock)
+
+      user.invalidate_personal_projects_count
+    end
+  end
+
   describe '#allow_password_authentication_for_web?' do
     context 'regular user' do
       let(:user) { build(:user) }
@@ -2283,11 +2297,9 @@ describe User do
       user = build(:user)
       projects = double(:projects, count: 1)
 
-      expect(user).to receive(:personal_projects).once.and_return(projects)
+      expect(user).to receive(:personal_projects).and_return(projects)
 
-      2.times do
-        expect(user.personal_projects_count).to eq(1)
-      end
+      expect(user.personal_projects_count).to eq(1)
     end
   end
 

spec/services/projects/create_service_spec.rb

@@ -28,6 +28,14 @@ describe Projects::CreateService, '#execute' do
     end
   end
 
+  describe 'after create actions' do
+    it 'invalidate personal_projects_count caches' do
+      expect(user).to receive(:invalidate_personal_projects_count)
+
+      create_project(user, opts)
+    end
+  end
+
   context "admin creates project with other user's namespace_id" do
     it 'sets the correct permissions' do
       admin = create(:admin)

spec/services/projects/destroy_service_spec.rb

@@ -66,6 +66,12 @@ describe Projects::DestroyService do
     end
 
     it_behaves_like 'deleting the project'
+
+    it 'invalidates personal_project_count cache' do
+      expect(user).to receive(:invalidate_personal_projects_count)
+
+      destroy_project(project, user)
+    end
   end
 
   context 'Sidekiq fake' do

spec/services/projects/transfer_service_spec.rb

@@ -37,6 +37,12 @@ describe Projects::TransferService do
       transfer_project(project, user, group)
     end
 
+    it 'invalidates the user\'s personal_project_count cache' do
+      expect(user).to receive(:invalidate_personal_projects_count)
+
+      transfer_project(project, user, group)
+    end
+
     it 'executes system hooks' do
       transfer_project(project, user, group) do |service|
         expect(service).to receive(:execute_system_hooks)