Add value to onboarding_issues_settings cookie

For hiding advanced issues on the frontend

app/controllers/registrations/experience_levels_controller.rb

@@ -13,6 +13,7 @@ module Registrations
       current_user.experience_level = params[:experience_level]
 
       if current_user.save
+        hide_advanced_issues
         flash[:message] = I18n.t('devise.registrations.signed_up')
         redirect_to group_path(params[:namespace_path])
       else
@@ -29,5 +30,15 @@ module Registrations
     def ensure_namespace_path_param
       redirect_to root_path unless params[:namespace_path].present?
     end
+
+    def hide_advanced_issues
+      return unless current_user.user_preference.novice?
+
+      settings = cookies[:onboarding_issues_settings]
+      return unless settings
+
+      modified_settings = Gitlab::Json.parse(settings).merge(hideAdvanced: true)
+      cookies[:onboarding_issues_settings] = modified_settings.to_json
+    end
   end
 end

spec/controllers/registrations/experience_levels_controller_spec.rb

@@ -97,6 +97,38 @@ describe Registrations::ExperienceLevelsController do
           it { is_expected.to have_gitlab_http_status(:redirect) }
           it { is_expected.to redirect_to(root_path) }
         end
+
+        describe 'applying the chosen level' do
+          context "when an 'onboarding_issues_settings' cookie does not exist" do
+            let(:params) { super().merge(experience_level: :novice) }
+
+            it 'does not change the cookie' do
+              expect { subject }.not_to change { cookies[:onboarding_issues_settings] }
+            end
+          end
+
+          context "when an 'onboarding_issues_settings' cookie does exist" do
+            before do
+              request.cookies[:onboarding_issues_settings] = '{}'
+            end
+
+            context 'when novice' do
+              let(:params) { super().merge(experience_level: :novice) }
+
+              it "adds a 'hideAdvanced' setting to the cookie" do
+                expect { subject }.to change { Gitlab::Json.parse(cookies[:onboarding_issues_settings])['hideAdvanced'] }.from(nil).to(true)
+              end
+            end
+
+            context 'when experienced' do
+              let(:params) { super().merge(experience_level: :experienced) }
+
+              it 'does not change the cookie' do
+                expect { subject }.not_to change { cookies[:onboarding_issues_settings] }
+              end
+            end
+          end
+        end
       end
 
       context 'when user update fails' do