Fix dependency proxy manifest sorting on pagination

app/graphql/types/dependency_proxy/manifest_type.rb

@@ -8,6 +8,7 @@ module Types
 
     authorize :read_dependency_proxy
 
+    field :id, ::Types::GlobalIDType[::DependencyProxy::Manifest], null: false, description: 'ID of the manifest.'
     field :created_at, Types::TimeType, null: false, description: 'Date of creation.'
     field :updated_at, Types::TimeType, null: false, description: 'Date of most recent update.'
     field :file_name, GraphQL::Types::String, null: false, description: 'Name of the manifest.'

app/graphql/types/group_type.rb

@@ -220,6 +220,10 @@ module Types
       group.container_repositories.size
     end
 
+    def dependency_proxy_manifests
+      group.dependency_proxy_manifests.order_id_desc
+    end
+
     def dependency_proxy_image_count
       group.dependency_proxy_manifests.count
     end

app/models/dependency_proxy/manifest.rb

@@ -14,6 +14,8 @@ class DependencyProxy::Manifest < ApplicationRecord
   validates :file_name, presence: true
   validates :digest, presence: true
 
+  scope :order_id_desc, -> { reorder(id: :desc) }
+
   mount_file_store_uploader DependencyProxy::FileUploader
 
   def self.find_by_file_name_or_digest(file_name:, digest:)

doc/api/graphql/reference/index.md

@@ -9236,6 +9236,7 @@ Dependency proxy manifest.
 | <a id="dependencyproxymanifestcreatedat"></a>`createdAt` | [`Time!`](#time) | Date of creation. |
 | <a id="dependencyproxymanifestdigest"></a>`digest` | [`String!`](#string) | Digest of the manifest. |
 | <a id="dependencyproxymanifestfilename"></a>`fileName` | [`String!`](#string) | Name of the manifest. |
+| <a id="dependencyproxymanifestid"></a>`id` | [`DependencyProxyManifestID!`](#dependencyproxymanifestid) | ID of the manifest. |
 | <a id="dependencyproxymanifestimagename"></a>`imageName` | [`String!`](#string) | Name of the image. |
 | <a id="dependencyproxymanifestsize"></a>`size` | [`String!`](#string) | Size of the manifest file. |
 | <a id="dependencyproxymanifestupdatedat"></a>`updatedAt` | [`Time!`](#time) | Date of most recent update. |
@@ -17275,6 +17276,12 @@ An example `DastSiteValidationID` is: `"gid://gitlab/DastSiteValidation/1"`.
 
 Date represented in ISO 8601.
 
+### `DependencyProxyManifestID`
+
+A `DependencyProxyManifestID` is a global ID. It is encoded as a string.
+
+An example `DependencyProxyManifestID` is: `"gid://gitlab/DependencyProxy::Manifest/1"`.
+
 ### `DesignManagementDesignAtVersionID`
 
 A `DesignManagementDesignAtVersionID` is a global ID. It is encoded as a string.

spec/graphql/types/dependency_proxy/manifest_type_spec.rb

@@ -5,7 +5,7 @@ require 'spec_helper'
 RSpec.describe GitlabSchema.types['DependencyProxyManifest'] do
   it 'includes dependency proxy manifest fields' do
     expected_fields = %w[
-      file_name image_name size created_at updated_at digest
+      id file_name image_name size created_at updated_at digest
     ]
 
     expect(described_class).to include_graphql_fields(*expected_fields)

spec/models/dependency_proxy/manifest_spec.rb

@@ -15,6 +15,17 @@ RSpec.describe DependencyProxy::Manifest, type: :model do
     it { is_expected.to validate_presence_of(:digest) }
   end
 
+  describe 'scopes' do
+    let_it_be(:manifest_one) { create(:dependency_proxy_manifest) }
+    let_it_be(:manifest_two) { create(:dependency_proxy_manifest) }
+    let_it_be(:manifests) { [manifest_one, manifest_two] }
+    let_it_be(:ids) { manifests.map(&:id) }
+
+    it 'order_id_desc' do
+      expect(described_class.where(id: ids).order_id_desc.to_a).to eq [manifest_two, manifest_one]
+    end
+  end
+
   describe 'file is being stored' do
     subject { create(:dependency_proxy_manifest) }
 

spec/requests/api/graphql/group/dependency_proxy_manifests_spec.rb

@@ -116,4 +116,26 @@ RSpec.describe 'getting dependency proxy manifests in a group' do
 
     expect(dependency_proxy_image_count_response).to eq(manifests.size)
   end
+
+  describe 'sorting and pagination' do
+    let(:data_path) { ['group', :dependencyProxyManifests] }
+    let(:current_user) { owner }
+
+    context 'with default sorting' do
+      let_it_be(:descending_manifests) { manifests.reverse.map { |manifest| global_id_of(manifest)} }
+
+      it_behaves_like 'sorted paginated query' do
+        let(:sort_param) { '' }
+        let(:first_param) { 2 }
+        let(:all_records) { descending_manifests }
+      end
+    end
+
+    def pagination_query(params)
+      # remove sort since the type does not accept sorting, but be future proof
+      graphql_query_for('group', { 'fullPath' => group.full_path },
+        query_nodes(:dependencyProxyManifests, :id, include_pagination_info: true, args: params.merge(sort: nil))
+      )
+    end
+  end
 end