Refactor activity_path into separate model methods

app/controllers/invites_controller.rb

@@ -125,14 +125,14 @@ class InvitesController < ApplicationController
                             name: member.source.full_name,
                             url: project_url(member.source),
                             title: _("project"),
-                            path: activity_project_path(member.source)
+                            path: member.source.activity_path
                           }
                         when Group
                           {
                             name: member.source.name,
                             url: group_url(member.source),
                             title: _("group"),
-                            path: activity_group_path(member.source)
+                            path: member.source.activity_path
                           }
                         end
   end

app/controllers/registrations/welcome_controller.rb

@@ -18,8 +18,10 @@ module Registrations
       if result[:status] == :success
         return redirect_to new_users_sign_up_group_path if show_signup_onboarding?
 
-        if current_user.members.count == 1
-          redirect_to path_for_signed_in_user(current_user), notice: helpers.invite_accepted_notice(current_user.members.last)
+        members = current_user.members
+
+        if members.count == 1 && members.last.source.present?
+          redirect_to members_activity_path(members), notice: helpers.invite_accepted_notice(members.last)
         else
           redirect_to path_for_signed_in_user(current_user)
         end
@@ -52,20 +54,14 @@ module Registrations
     def path_for_signed_in_user(user)
       return users_almost_there_path if requires_confirmation?(user)
 
-      stored_location_for(user) || members_activity_path(user)
+      stored_location_for(user) || members_activity_path(user.members)
     end
 
-    def members_activity_path(user)
-      return dashboard_projects_path unless user.members.count >= 1
+    def members_activity_path(members)
+      return dashboard_projects_path unless members.any?
+      return dashboard_projects_path unless members.last.source.present?
 
-      case user.members.last.source
-      when Project
-        activity_project_path(user.members.last.source)
-      when Group
-        activity_group_path(user.members.last.source)
-      else
-        dashboard_projects_path
-      end
+      members.last.source.activity_path
     end
 
     def show_signup_onboarding?

app/models/group.rb

@@ -708,6 +708,10 @@ class Group < Namespace
     model_name.singular
   end
 
+  def activity_path
+    Gitlab::Routing.url_helpers.activity_group_path(self)
+  end
+
   private
 
   def update_two_factor_requirement

app/models/project.rb

@@ -2570,6 +2570,10 @@ class Project < ApplicationRecord
     Feature.enabled?(:inherited_issuable_templates, self, default_enabled: :yaml)
   end
 
+  def activity_path
+    Gitlab::Routing.url_helpers.activity_project_path(self)
+  end
+
   private
 
   def set_container_registry_access_level

spec/controllers/registrations/welcome_controller_spec.rb

@@ -77,6 +77,30 @@ RSpec.describe Registrations::WelcomeController do
 
       it { is_expected.to redirect_to(dashboard_projects_path)}
 
+      context 'when the new user already has any accepted group membership' do
+        let!(:member1) { create(:group_member, user: user) }
+
+        it 'redirects to the group activity page' do
+          expect(subject).to redirect_to(activity_group_path(member1.source))
+        end
+
+        context 'when the new user already has more than 1 accepted group membership' do
+          it 'redirects to the most recent membership group activty page' do
+            member2 = create(:group_member, user: user)
+
+            expect(subject).to redirect_to(activity_group_path(member2.source))
+          end
+        end
+
+        context 'when the member has an orphaned source at the time of the welcome' do
+          it 'redirects to the project dashboard page' do
+            member1.source.delete
+
+            expect(subject).to redirect_to(dashboard_projects_path)
+          end
+        end
+      end
+
       context 'when the user opted in' do
         let(:email_opted_in) { '1' }
 

spec/models/group_spec.rb

@@ -2398,4 +2398,12 @@ RSpec.describe Group do
       expect(group.to_ability_name).to eq('group')
     end
   end
+
+  describe '#activity_path' do
+    it 'returns the group activity_path' do
+      expected_path = "/groups/#{group.name}/-/activity"
+
+      expect(group.activity_path).to eq(expected_path)
+    end
+  end
 end

spec/models/project_spec.rb

@@ -6890,6 +6890,14 @@ RSpec.describe Project, factory_default: :keep do
         end
       end
     end
+
+    describe '#activity_path' do
+      it 'returns the project activity_path' do
+        expected_path = "/#{project.namespace.path}/#{project.name}/activity"
+
+        expect(project.activity_path).to eq(expected_path)
+      end
+    end
   end
 
   describe '#default_branch_or_main' do