Fix errorcode 500 on slash commands

Coverage was failing, so this could slip through the cracks

lib/gitlab/chat_commands/deploy.rb

@@ -49,8 +49,9 @@ module Gitlab
       end
       def url(subject)
-        polymorphic_url(
-          [ subject.project.namespace.becomes(Namespace), subject.project, subject ])
+        project = subject.project
+
+        namespace_project_build_url(project.namespace.becomes(Namespace), project, subject)
       end
     end
   end

lib/gitlab/chat_commands/presenter.rb

@@ -30,12 +30,12 @@ module Gitlab
         if subject.is_a?(Gitlab::ChatCommands::Result)
           show_result(subject)
         elsif subject.respond_to?(:count)
-          if subject.many?
-            multiple_resources(subject)
-          elsif subject.none?
+          if subject.none?
             not_found
+          elsif subject.one?
+            single_resource(subject.first)
           else
-            single_resource(subject)
+            multiple_resources(subject)
           end
         else
           single_resource(subject)
@@ -71,9 +71,9 @@ module Gitlab
       end
       def multiple_resources(resources)
-        resources.map! { |resource| title(resource) }
-        message = header_with_list("Multiple results were found:", resources)
+        titles = resources.map { |resource| title(resource) }
+        message = header_with_list("Multiple results were found:", titles)
         ephemeral_response(message)
       end

spec/lib/gitlab/chat_commands/command_spec.rb

@@ -54,6 +54,30 @@ describe Gitlab::ChatCommands::Command, service: true do
       end
     end
+    context 'searching for an issue' do
+      let(:params) { { text: 'issue search find me' } }
+      let!(:issue) { create(:issue, project: project, title: 'find me') }
+
+      before do
+        project.team << [user, :master]
+      end
+
+      context 'a single issue is found' do
+        it 'presents the issue' do
+          expect(subject[:text]).to match(issue.title)
+        end
+      end
+
+      context 'multiple issues found' do
+        let!(:issue2) { create(:issue, project: project, title: "someone find me") }
+
+        it 'shows a link to the new issue' do
+          expect(subject[:text]).to match(issue.title)
+          expect(subject[:text]).to match(issue2.title)
+        end
+      end
+    end
+
     context 'when trying to do deployment' do
       let(:params) { { text: 'deploy staging to production' } }
       let!(:build) { create(:ci_build, project: project) }

spec/models/project_services/mattermost_slash_commands_service_spec.rb

@@ -6,7 +6,7 @@ describe MattermostSlashCommandsService, :models do
   context 'Mattermost API' do
     let(:project) { create(:empty_project) }
     let(:service) { project.build_mattermost_slash_commands_service }
-    let(:user) { create(:user)}
+    let(:user) { create(:user) }
     before do
       Mattermost::Session.base_uri("http://mattermost.example.com")