Add pagination and new routing

- routes for project
- routes for groups
- pagination in serialiser
- project controller
- group controller

app/controllers/groups/registry/repositories_controller.rb

@@ -14,13 +14,24 @@ module Groups
 
             track_event(:list_repositories)
 
-            render json: ContainerRepositoriesSerializer
+            serializer = ContainerRepositoriesSerializer
               .new(current_user: current_user)
-              .represent_read_only(@images)
+
+            if Feature.enabled?(:vue_container_registry_explorer)
+              render json: serializer.with_pagination(request, response)
+                .represent_read_only(@images)
+            else
+              render json: serializer.represent_read_only(@images)
+            end
           end
         end
       end
 
+      # The show action renders index to allow frontend routing to work on page refresh
+      def show
+        render :index
+      end
+
       private
 
       def feature_flag_group_container_registry_browser!

app/controllers/projects/registry/repositories_controller.rb

@@ -14,13 +14,23 @@ module Projects
 
             track_event(:list_repositories)
 
-            render json: ContainerRepositoriesSerializer
+            serializer = ContainerRepositoriesSerializer
               .new(project: project, current_user: current_user)
-              .represent(@images)
+
+            if Feature.enabled?(:vue_container_registry_explorer)
+              render json: serializer.with_pagination(request, response).represent(@images)
+            else
+              render json: serializer.represent(@images)
+            end
           end
         end
       end
 
+      # The show action renders index to allow frontend routing to work on page refresh
+      def show
+        render :index
+      end
+
       def destroy
         DeleteContainerRepositoryWorker.perform_async(current_user.id, image.id)
         track_event(:delete_repository)

app/serializers/container_repositories_serializer.rb

 # frozen_string_literal: true
 
 class ContainerRepositoriesSerializer < BaseSerializer
+  include WithPagination
   entity ContainerRepositoryEntity
 
   def represent_read_only(resource)

changelogs/unreleased/23315-routing-changes-and-pagination-for-container-registry.yml

+---
+title: Add show routes for group and project repositories_controllers and add pagination
+  to the index responses
+merge_request: 23151
+author:
+type: added

config/routes/group.rb

@@ -76,7 +76,7 @@ constraints(::Constraints::GroupUrlConstrainer.new) do
       end
     end
 
-    resources :container_registries, only: [:index], controller: 'registry/repositories'
+    resources :container_registries, only: [:index, :show], controller: 'registry/repositories'
   end
 
   scope(path: '*id',

config/routes/project.rb

@@ -371,7 +371,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
         end
       end
 
-      resources :container_registry, only: [:index, :destroy],
+      resources :container_registry, only: [:index, :destroy, :show],
                                      controller: 'registry/repositories'
 
       namespace :registry do

spec/controllers/groups/registry/repositories_controller_spec.rb

@@ -14,7 +14,7 @@ describe Groups::Registry::RepositoriesController do
     sign_in(user)
   end
 
-  context 'GET #index' do
+  shared_examples 'renders a list of repositories' do
     context 'when container registry is enabled' do
       it 'show index page' do
         expect(Gitlab::Tracking).not_to receive(:event)
@@ -33,6 +33,7 @@ describe Groups::Registry::RepositoriesController do
         }
 
         expect(response).to match_response_schema('registry/repositories')
+        expect(response).to include_pagination_headers
       end
 
       it 'returns a list of projects for json format' do
@@ -89,5 +90,29 @@ describe Groups::Registry::RepositoriesController do
         expect(response).to have_gitlab_http_status(:not_found)
       end
     end
+
+    context 'with :vue_container_registry_explorer feature flag disabled' do
+      before do
+        stub_feature_flags(vue_container_registry_explorer: false)
+      end
+
+      it 'has the correct response schema' do
+        get :index, params: {
+          group_id: group,
+          format: :json
+        }
+
+        expect(response).to match_response_schema('registry/repositories')
+        expect(response).not_to include_pagination_headers
+      end
+    end
+  end
+
+  context 'GET #index' do
+    it_behaves_like 'renders a list of repositories'
+  end
+
+  context 'GET #show' do
+    it_behaves_like 'renders a list of repositories'
   end
 end

spec/controllers/projects/registry/repositories_controller_spec.rb

@@ -16,7 +16,7 @@ describe Projects::Registry::RepositoriesController do
       project.add_developer(user)
     end
 
-    describe 'GET index' do
+    shared_examples 'renders a list of repositories' do
       context 'when root container repository exists' do
         before do
           create(:container_repository, :root, project: project)
@@ -58,6 +58,7 @@ describe Projects::Registry::RepositoriesController do
 
             expect(response).to have_gitlab_http_status(:ok)
             expect(response).to match_response_schema('registry/repositories')
+            expect(response).to include_pagination_headers
           end
         end
 
@@ -84,9 +85,33 @@ describe Projects::Registry::RepositoriesController do
           end
         end
       end
+
+      context 'with :vue_container_registry_explorer feature flag disabled' do
+        before do
+          stub_feature_flags(vue_container_registry_explorer: false)
+          stub_container_registry_tags(repository: project.full_path,
+                                       tags: %w[rc1 latest])
+        end
+
+        it 'json has a list of projects' do
+          go_to_index(format: :json)
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(response).to match_response_schema('registry/repositories')
+          expect(response).not_to include_pagination_headers
+        end
+      end
+    end
+
+    describe 'GET #index' do
+      it_behaves_like 'renders a list of repositories'
+    end
+
+    describe 'GET #show' do
+      it_behaves_like 'renders a list of repositories'
     end
 
-    describe 'DELETE destroy' do
+    describe 'DELETE #destroy' do
       context 'when root container repository exists' do
         let!(:repository) do
           create(:container_repository, :root, project: project)
@@ -115,7 +140,7 @@ describe Projects::Registry::RepositoriesController do
   end
 
   context 'when user does not have access to registry' do
-    describe 'GET index' do
+    describe 'GET #index' do
       it 'responds with 404' do
         go_to_index
 

spec/serializers/container_repositories_serializer_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ContainerRepositoriesSerializer do
+  let(:user) { create(:user) }
+  let(:project) { create(:project) }
+  let(:resource) { create(:container_repository, name: 'image', project: project) }
+  let(:params) { { current_user: user, project: project } }
+
+  before do
+    project.add_developer(user)
+
+    stub_container_registry_config(enabled: true)
+    stub_container_registry_tags(repository: /image/, tags: %w(rootA latest))
+  end
+
+  describe '#represent' do
+    subject do
+      described_class.new(params).represent(resource)
+    end
+
+    it 'has basic attributes' do
+      expect(subject).to include(:id, :name, :path, :location, :created_at, :tags_path, :destroy_path)
+    end
+  end
+
+  describe '#represent_read_only' do
+    subject do
+      described_class.new(current_user: user, project: project).represent_read_only(resource)
+    end
+
+    it 'does not include destroy_path' do
+      expect(subject).to include(:id, :name, :path, :location, :created_at, :tags_path)
+      expect(subject).not_to include(:destroy_path)
+    end
+  end
+
+  describe '#with_pagination' do
+    let(:request) do
+      double(
+        url: "#{Gitlab.config.gitlab.url}:8080/#{project.namespace_id}/#{project.id}/container_registry?#{query.to_query}",
+        query_parameters: query
+      )
+    end
+
+    let(:response) { spy('response') }
+    let(:resource) { ContainerRepository.all }
+    let(:query) { { page: 1, per_page: 2 } }
+
+    let(:serializer) do
+      described_class
+        .new(current_user: user, project: project)
+        .with_pagination(request, response)
+    end
+
+    subject do
+      serializer.represent(resource)
+    end
+
+    it 'creates a paginated serializer' do
+      expect(serializer).to be_paginated
+    end
+
+    context 'when multiple ContainerRepository objects are serialized' do
+      before do
+        create_list(:container_repository, 5, project: project)
+      end
+
+      it 'serializes appropriate number of objects' do
+        expect(subject.count).to be 2
+      end
+
+      it 'appends relevant headers' do
+        expect(response).to include_pagination_headers
+        expect(response).to receive(:[]=).with('X-Total', '5')
+        expect(response).to receive(:[]=).with('X-Total-Pages', '3')
+        expect(response).to receive(:[]=).with('X-Per-Page', '2')
+
+        subject
+      end
+    end
+  end
+end