Fix GitLab Slack application configuration

app/controllers/projects/settings/integrations_controller.rb

@@ -11,7 +11,18 @@ module Projects
         @hook = ProjectHook.new
 
         # Services
-        @services = @project.find_or_initialize_services
+        @services = @project.find_or_initialize_services(exceptions: service_exceptions)
+      end
+
+      private
+
+      # Returns a list of services that should be hidden from the list
+      def service_exceptions
+        if current_application_settings.slack_app_enabled
+          ['slack_slash_commands']
+        else
+          ['gitlab_slack_application']
+        end
       end
     end
   end

app/models/project.rb

@@ -795,10 +795,12 @@ class Project < ActiveRecord::Base
     update_column(:has_external_wiki, services.external_wikis.any?)
   end
 
-  def find_or_initialize_services
+  def find_or_initialize_services(exceptions: [])
     services_templates = Service.where(template: true)
 
-    Service.available_services_names.map do |service_name|
+    available_services_names = Service.available_services_names - exceptions
+
+    available_services_names.map do |service_name|
       service = find_service(services, service_name)
 
       if service

app/models/service.rb

@@ -246,6 +246,7 @@ class Service < ActiveRecord::Base
       pushover
       redmine
       slack
+      slack_slash_commands
       teamcity
       microsoft_teams
     ]
@@ -253,14 +254,10 @@ class Service < ActiveRecord::Base
       service_names += %w[mock_ci mock_deployment mock_monitoring]
     end
 
-    if show_gitlab_slack_application?
+    if Gitlab.com? || Rails.env.development?
       service_names.push('gitlab_slack_application')
     end
 
-    unless Gitlab.com?
-      service_names.push('slack_slash_commands')
-    end
-
     service_names.sort_by(&:downcase)
   end
 
@@ -271,10 +268,6 @@ class Service < ActiveRecord::Base
     service
   end
 
-  def self.show_gitlab_slack_application?
-    (Gitlab.com? && current_application_settings.slack_app_enabled) || Rails.env.development?
-  end
-
   private
 
   def cache_project_has_external_issue_tracker

spec/controllers/projects/settings/integrations_controller_spec.rb

@@ -17,4 +17,27 @@ describe Projects::Settings::IntegrationsController do
       expect(response).to render_template(:show)
     end
   end
+
+  context 'Sets correct services list' do
+    it 'enables SlackSlashCommandsService and disables GitlabSlackApplication' do
+      get :show, namespace_id: project.namespace, project_id: project
+
+      services = assigns(:services).map(&:type)
+
+      expect(services).to include('SlackSlashCommandsService')
+      expect(services).not_to include('GitlabSlackApplicationService')
+    end
+
+    it 'enables GitlabSlackApplication and disables SlackSlashCommandsService' do
+      stub_application_setting(slack_app_enabled: true)
+      allow(::Gitlab).to receive(:com?).and_return(true)
+
+      get :show, namespace_id: project.namespace, project_id: project
+
+      services = assigns(:services).map(&:type)
+
+      expect(services).to include('GitlabSlackApplicationService')
+      expect(services).not_to include('SlackSlashCommandsService')
+    end
+  end
 end

spec/controllers/projects/settings/slacks_controller_spec.rb

@@ -24,7 +24,7 @@ describe Projects::Settings::SlacksController do
         .to receive(:new).with(project, user, anything).and_return(service)
     end
 
-    it 'calls service and redirects with no flash message if result is successful' do
+    it 'calls service and redirects with no alerts if result is successful' do
       stub_service(status: :success)
 
       get :slack_auth, namespace_id: project.namespace, project_id: project
@@ -34,7 +34,7 @@ describe Projects::Settings::SlacksController do
       expect(flash[:alert]).to be_nil
     end
 
-    it 'calls service and redirects with flash message if there is error' do
+    it 'calls service and redirects with the alert if there is error' do
       stub_service(status: :error, message: 'error')
 
       get :slack_auth, namespace_id: project.namespace, project_id: project

spec/features/projects/settings/slack_application_spec.rb

@@ -13,7 +13,7 @@ feature 'Slack application', feature: true do
 
     create(:slack_integration, service: service)
 
-    allow(Service).to receive(:show_gitlab_slack_application?).and_return(true)
+    allow(Gitlab).to receive(:com?).and_return(true)
   end
 
   scenario 'I can edit slack integration' do