Add NPM dependencies support

Add `Packages::Dependency` and `Packages::DependencyLink`
  models
Add or update related services
Update `NpmPackagePresenter` to properly include dependencies

Co-Authored-By: Sara Ahbabou <sahbabou@gitlab.com>

db/migrate/20191121111621_create_packages_dependencies.rb

+# frozen_string_literal: true
+
+class CreatePackagesDependencies < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  def change
+    create_table :packages_dependencies do |t|
+      t.string :name, null: false, limit: 255
+      t.string :version_pattern, null: false, limit: 255
+    end
+
+    add_index :packages_dependencies, [:name, :version_pattern], unique: true
+  end
+end

db/migrate/20191121121947_create_packages_dependency_links.rb

+# frozen_string_literal: true
+
+class CreatePackagesDependencyLinks < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  def change
+    create_table :packages_dependency_links do |t|
+      t.references :package, index: false, null: false, foreign_key: { to_table: :packages_packages, on_delete: :cascade }, type: :bigint
+      t.references :dependency, null: false, foreign_key: { to_table: :packages_dependencies, on_delete: :cascade }, type: :bigint
+      t.integer :dependency_type, limit: 2, null: false
+    end
+
+    add_index :packages_dependency_links, [:package_id, :dependency_id, :dependency_type], unique: true, name: 'idx_pkgs_dep_links_on_pkg_id_dependency_id_dependency_type'
+  end
+end

db/migrate/20191121161018_add_project_id_name_version_package_type_index_to_packages_packages.rb

+# frozen_string_literal: true
+
+class AddProjectIdNameVersionPackageTypeIndexToPackagesPackages < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'idx_packages_packages_on_project_id_name_version_package_type'.freeze
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :packages_packages,
+                         [:project_id, :name, :version, :package_type],
+                         name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index :packages_packages,
+                            [:project_id, :name, :version, :package_type],
+                            name: INDEX_NAME
+  end
+end

db/post_migrate/20191121122856_drop_packages_package_metadata_table.rb

+# frozen_string_literal: true
+
+class DropPackagesPackageMetadataTable < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  def up
+    drop_table :packages_package_metadata
+  end
+
+  def down
+    create_table :packages_package_metadata do |t|
+      t.references :package, index: { unique: true }, null: false, foreign_key: { to_table: :packages_packages, on_delete: :cascade }, type: :integer
+      t.binary :metadata, null: false
+    end
+  end
+end

db/schema.rb

@@ -2822,6 +2822,20 @@ ActiveRecord::Schema.define(version: 2019_12_04_093410) do
     t.index ["package_id"], name: "index_packages_conan_metadata_on_package_id", unique: true
   end
+  create_table "packages_dependencies", force: :cascade do |t|
+    t.string "name", limit: 255, null: false
+    t.string "version_pattern", limit: 255, null: false
+    t.index ["name", "version_pattern"], name: "index_packages_dependencies_on_name_and_version_pattern", unique: true
+  end
+
+  create_table "packages_dependency_links", force: :cascade do |t|
+    t.bigint "package_id", null: false
+    t.bigint "dependency_id", null: false
+    t.integer "dependency_type", limit: 2, null: false
+    t.index ["dependency_id"], name: "index_packages_dependency_links_on_dependency_id"
+    t.index ["package_id", "dependency_id", "dependency_type"], name: "idx_pkgs_dep_links_on_pkg_id_dependency_id_dependency_type", unique: true
+  end
+
   create_table "packages_maven_metadata", force: :cascade do |t|
     t.bigint "package_id", null: false
     t.datetime_with_timezone "created_at", null: false
@@ -2847,12 +2861,6 @@ ActiveRecord::Schema.define(version: 2019_12_04_093410) do
     t.index ["package_id", "file_name"], name: "index_packages_package_files_on_package_id_and_file_name"
   end
-  create_table "packages_package_metadata", force: :cascade do |t|
-    t.integer "package_id", null: false
-    t.binary "metadata", null: false
-    t.index ["package_id"], name: "index_packages_package_metadata_on_package_id", unique: true
-  end
-
   create_table "packages_package_tags", force: :cascade do |t|
     t.integer "package_id", null: false
     t.string "name", limit: 255, null: false
@@ -2867,6 +2875,7 @@ ActiveRecord::Schema.define(version: 2019_12_04_093410) do
     t.string "version"
     t.integer "package_type", limit: 2, null: false
     t.index ["name"], name: "index_packages_packages_on_name_trigram", opclass: :gin_trgm_ops, using: :gin
+    t.index ["project_id", "name", "version", "package_type"], name: "idx_packages_packages_on_project_id_name_version_package_type"
     t.index ["project_id"], name: "index_packages_packages_on_project_id"
   end
@@ -4565,9 +4574,10 @@ ActiveRecord::Schema.define(version: 2019_12_04_093410) do
   add_foreign_key "operations_feature_flags_clients", "projects", on_delete: :cascade
   add_foreign_key "packages_conan_file_metadata", "packages_package_files", column: "package_file_id", on_delete: :cascade
   add_foreign_key "packages_conan_metadata", "packages_packages", column: "package_id", on_delete: :cascade
+  add_foreign_key "packages_dependency_links", "packages_dependencies", column: "dependency_id", on_delete: :cascade
+  add_foreign_key "packages_dependency_links", "packages_packages", column: "package_id", on_delete: :cascade
   add_foreign_key "packages_maven_metadata", "packages_packages", column: "package_id", name: "fk_be88aed360", on_delete: :cascade
   add_foreign_key "packages_package_files", "packages_packages", column: "package_id", name: "fk_86f0f182f8", on_delete: :cascade
-  add_foreign_key "packages_package_metadata", "packages_packages", column: "package_id", on_delete: :cascade
   add_foreign_key "packages_package_tags", "packages_packages", column: "package_id", on_delete: :cascade
   add_foreign_key "packages_packages", "projects", on_delete: :cascade
   add_foreign_key "pages_domain_acme_orders", "pages_domains", on_delete: :cascade

doc/user/packages/npm_registry/index.md

@@ -122,7 +122,7 @@ Then, you could run `npm publish` either locally or via GitLab CI/CD:
 - **GitLab CI/CD:** Set an `NPM_TOKEN` [variable](../../../ci/variables/README.md)
   under your project's **Settings > CI/CD > Variables**.
-  
+
 ### Authenticating with a CI job token
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/9104) in GitLab Premium 12.5.
@@ -130,7 +130,7 @@ Then, you could run `npm publish` either locally or via GitLab CI/CD:
 If you’re using NPM with GitLab CI/CD, a CI job token can be used instead of a personal access token.
 The token will inherit the permissions of the user that generates the pipeline.
-Add a corresponding section to your `.npmrc` file:  
+Add a corresponding section to your `.npmrc` file:
 ```ini
 @foo:registry=https://gitlab.com/api/v4/packages/npm/
@@ -226,3 +226,19 @@ And the `.npmrc` file should look like:
 //gitlab.com/api/v4/packages/npm/:_authToken=<your_oauth_token>
 @foo:registry=https://gitlab.com/api/v4/packages/npm/
 ```
+
+## NPM dependencies metadata
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/11867) in GitLab Premium 12.6.
+
+Starting from GitLab 12.6, new packages published to the GitLab NPM Registry expose the following attributes to the NPM client:
+
+- name
+- version
+- dist-tags
+- dependencies
+  - dependencies
+  - devDependencies
+  - bundleDependencies
+  - peerDependencies
+  - deprecated

ee/app/models/packages/dependency.rb

+# frozen_string_literal: true
+class Packages::Dependency < ApplicationRecord
+  has_many :dependency_links, class_name: 'Packages::DependencyLink'
+
+  validates :name, :version_pattern, presence: true
+
+  validates :name, uniqueness: { scope: :version_pattern }
+
+  NAME_VERSION_PATTERN_TUPLE_MATCHING = '(name, version_pattern) = (?, ?)'.freeze
+  MAX_STRING_LENGTH = 255.freeze
+  MAX_CHUNKED_QUERIES_COUNT = 10.freeze
+
+  def self.for_package_names_and_version_patterns(names_and_version_patterns = {}, chunk_size = 50, max_rows_limit = 200)
+    names_and_version_patterns.reject! { |key, value| key.size > MAX_STRING_LENGTH || value.size > MAX_STRING_LENGTH }
+    raise ArgumentError, 'Too many names_and_version_patterns' if names_and_version_patterns.size > MAX_CHUNKED_QUERIES_COUNT * chunk_size
+
+    matched_ids = []
+    names_and_version_patterns.each_slice(chunk_size) do |tuples|
+      where_statement = Array.new(tuples.size, NAME_VERSION_PATTERN_TUPLE_MATCHING)
+                             .join(' OR ')
+      ids = where(where_statement, *tuples.flatten)
+              .limit(max_rows_limit + 1)
+              .pluck(:id)
+      matched_ids.concat(ids)
+
+      raise ArgumentError, 'Too many Dependencies selected' if matched_ids.size > max_rows_limit
+    end
+
+    return none if matched_ids.empty?
+
+    where(id: matched_ids)
+  end
+
+  def self.pluck_ids_and_names
+    pluck(:id, :name)
+  end
+
+  def orphaned?
+    self.dependency_links.empty?
+  end
+end

ee/app/models/packages/dependency_link.rb

+# frozen_string_literal: true
+class Packages::DependencyLink < ApplicationRecord
+  belongs_to :package, inverse_of: :dependency_links
+  belongs_to :dependency, inverse_of: :dependency_links, class_name: 'Packages::Dependency'
+
+  validates :package, :dependency, presence: true
+
+  validates :dependency_type,
+    uniqueness: { scope: %i[package_id dependency_id] }
+
+  enum dependency_type: { dependencies: 1, devDependencies: 2, bundleDependencies: 3, peerDependencies: 4, deprecated: 5 }
+
+  scope :with_dependency_type, ->(dependency_type) { where(dependency_type: dependency_type) }
+  scope :includes_dependency, -> { includes(:dependency) }
+end

ee/app/models/packages/package.rb

@@ -5,6 +5,7 @@ class Packages::Package < ApplicationRecord
   belongs_to :project
   # package_files must be destroyed by ruby code in order to properly remove carrierwave uploads and update project statistics
   has_many :package_files, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
+  has_many :dependency_links, inverse_of: :package, class_name: 'Packages::DependencyLink'
   has_one :conan_metadatum, inverse_of: :package
   has_one :maven_metadatum, inverse_of: :package
@@ -19,6 +20,9 @@ class Packages::Package < ApplicationRecord
     presence: true,
     format: { with: Gitlab::Regex.package_name_regex }
+  validates :name,
+    uniqueness: { scope: %i[project_id version package_type] }
+
   validate :valid_npm_package_name, if: :npm?
   validate :package_already_taken, if: :npm?

ee/app/presenters/npm_package_presenter.rb

@@ -3,10 +3,11 @@
 class NpmPackagePresenter
   include API::Helpers::RelatedResourcesHelpers
-  attr_reader :project, :name, :packages
-  def initialize(project, name, packages)
-    @project = project
+  attr_reader :name, :packages
+  NPM_VALID_DEPENDENCY_TYPES = %i[dependencies devDependencies bundleDependencies peerDependencies deprecated].freeze
+
+  def initialize(name, packages)
     @name = name
     @packages = packages
   end
@@ -41,7 +42,9 @@ class NpmPackagePresenter
         shasum: package_file.file_sha1,
         tarball: tarball_url(package, package_file)
       }
-    }
+    }.tap do |package_version|
+      package_version.merge!(build_package_dependencies(package))
+    end
   end
   def tarball_url(package, package_file)
@@ -50,6 +53,22 @@ class NpmPackagePresenter
       "/-/#{package_file.file_name}"
   end
+  def build_package_dependencies(package)
+    return {} if package.dependency_links.empty?
+
+    dependencies = Hash.new { |h, key| h[key] = {} }
+    dependency_links = package.dependency_links
+                              .with_dependency_type(NPM_VALID_DEPENDENCY_TYPES)
+                              .includes_dependency
+
+    dependency_links.find_each do |dependency_link|
+      dependency = dependency_link.dependency
+      dependencies[dependency_link.dependency_type][dependency.name] = dependency.version_pattern
+    end
+
+    dependencies
+  end
+
   def sorted_versions
     versions = packages.map(&:version).compact
     VersionSorter.sort(versions)

ee/app/services/packages/create_dependency_service.rb

+# frozen_string_literal: true
+module Packages
+  class CreateDependencyService < BaseService
+    attr_reader :package, :dependencies
+
+    def initialize(package, dependencies)
+      @package = package
+      @dependencies = dependencies
+    end
+
+    def execute
+      Packages::DependencyLink.dependency_types.each_key do |type|
+        create_dependency(type)
+      end
+    end
+
+    private
+
+    def create_dependency(type)
+      return unless dependencies.key?(type)
+
+      names_and_version_patterns = dependencies[type].to_a
+      existing_ids, existing_names = find_existing_ids_and_names(names_and_version_patterns)
+      dependencies_to_insert = names_and_version_patterns
+
+      if existing_names.any?
+        dependencies_to_insert = names_and_version_patterns.reject { |e| e.first.in?(existing_names) }
+      end
+
+      ActiveRecord::Base.transaction do
+        inserted_ids = bulk_insert_package_dependencies(dependencies_to_insert)
+        bulk_insert_package_dependency_links(type, (existing_ids + inserted_ids))
+      end
+    end
+
+    def find_existing_ids_and_names(names_and_version_patterns)
+      ids_and_names = Packages::Dependency.for_package_names_and_version_patterns(names_and_version_patterns)
+                                          .pluck_ids_and_names
+      ids = ids_and_names.map(&:first) || []
+      names = ids_and_names.map(&:second) || []
+      [ids, names]
+    end
+
+    def bulk_insert_package_dependencies(names_and_version_patterns)
+      return [] if names_and_version_patterns.empty?
+
+      rows = names_and_version_patterns.map do |name, version_pattern|
+        {
+          name: name,
+          version_pattern: version_pattern
+        }
+      end
+
+      database.bulk_insert(Packages::Dependency.table_name, rows, return_ids: true)
+    end
+
+    def bulk_insert_package_dependency_links(type, dependency_ids)
+      rows = dependency_ids.map do |dependency_id|
+        {
+          package_id: package.id,
+          dependency_id: dependency_id,
+          dependency_type: Packages::DependencyLink.dependency_types[type.to_s]
+        }
+      end
+
+      database.bulk_insert(Packages::DependencyLink.table_name, rows)
+    end
+
+    def database
+      ::Gitlab::Database
+    end
+  end
+end

ee/app/services/packages/create_npm_package_service.rb

@@ -26,9 +26,17 @@ module Packages
         file_name: package_file_name
       }
-      ::Packages::CreatePackageFileService.new(package, file_params).execute
+      package.transaction do
+        ::Packages::CreatePackageFileService.new(package, file_params).execute
+        ::Packages::CreateDependencyService.new(package, package_dependencies).execute
+      end
       package
     end
+
+    def package_dependencies
+      _version, version_data = params[:versions].first
+      version_data
+    end
   end
 end

ee/changelogs/unreleased/10io-add-npm-dependencies-support.yml

+---
+title: Fix dependency metadata on the NPM registry responses
+merge_request: 20549
+author:
+type: fixed

ee/lib/api/npm_packages.rb

@@ -40,7 +40,7 @@ module API
       packages = ::Packages::NpmPackagesFinder
         .new(project, package_name).execute
-      present NpmPackagePresenter.new(project, package_name, packages),
+      present NpmPackagePresenter.new(package_name, packages),
         with: EE::API::Entities::NpmPackage
     end

ee/spec/factories/packages.rb

@@ -3,7 +3,7 @@ FactoryBot.define do
   factory :package, class: Packages::Package do
     project
     name { 'my/company/app/my-app' }
-    version { '1.0-SNAPSHOT' }
+    sequence(:version) { |n| "1.#{n}-SNAPSHOT" }
     package_type { 'maven' }
     factory :maven_package do
@@ -188,4 +188,15 @@ FactoryBot.define do
       conan_package_reference { '123456789' }
     end
   end
+
+  factory :packages_dependency, class: Packages::Dependency do
+    sequence(:name) { |n| "@test/package-#{n}"}
+    sequence(:version_pattern) { |n| "~6.2.#{n}" }
+  end
+
+  factory :packages_dependency_link, class: Packages::DependencyLink do
+    package
+    dependency { create(:packages_dependency) }
+    dependency_type { :dependencies }
+  end
 end

ee/spec/fixtures/api/schemas/public_api/v4/packages/npm_package_version.json

@@ -4,13 +4,43 @@
   "properties" : {
     "name": { "type": "string" },
     "version": { "type": "string" },
-    "dist": { 
+    "dist": {
       "type": "object",
       "required": ["shasum", "tarball"],
       "properties" : {
         "shasum": { "type": "string" },
         "tarball": { "type": "string" }
       }
+    },
+    "dependencies": {
+      "type": "object",
+      "patternProperties": {
+        ".{1,}": { "type": "string" }
+      }
+    },
+    "devDependencies": {
+      "type": "object",
+      "patternProperties": {
+        ".{1,}": { "type": "string" }
+      }
+    },
+    "bundleDependencies": {
+      "type": "object",
+      "patternProperties": {
+        ".{1,}": { "type": "string" }
+      }
+    },
+    "peerDependencies": {
+      "type": "object",
+      "patternProperties": {
+        ".{1,}": { "type": "string" }
+      }
+    },
+    "deprecated": {
+      "type": "object",
+      "patternProperties": {
+        ".{1,}": { "type": "string" }
+      }
     }
   }
 }

ee/spec/fixtures/npm/payload_with_duplicated_packages.json

+{
+  "_id":"@root/npm-test",
+  "name":"@root/npm-test",
+  "description":"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.",
+  "dist-tags":{
+     "latest":"1.0.1"
+  },
+  "versions":{
+     "1.0.1":{
+        "name":"@root/npm-test",
+        "version":"1.0.1",
+        "main":"app.js",
+        "dependencies":{
+           "express":"^4.16.4",
+           "dagre-d3": "~0.3.2"
+        },
+        "devDependencies": {
+           "dagre-d3": "~0.3.2",
+           "d3": "~3.4.13"
+        },
+        "bundleDependencies": {
+           "d3": "~3.4.13"
+        },
+        "peerDependencies": {
+           "d3": "~3.3.0"
+        },
+        "deprecated": {
+           "express":"^4.16.4"
+        },
+        "dist":{
+           "shasum":"f572d396fae9206628714fb2ce00f72e94f2258f"
+        }
+     }
+  },
+  "_attachments":{
+     "@root/npm-test-1.0.1.tgz":{
+        "content_type":"application/octet-stream",
+        "data":"aGVsbG8K",
+        "length":8
+     }
+  },
+  "id":"10",
+  "package_name":"@root/npm-test"
+}

ee/spec/models/packages/dependency_link_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe Packages::DependencyLink, type: :model do
+  describe 'relationships' do
+    it { is_expected.to belong_to(:package).inverse_of(:dependency_links) }
+    it { is_expected.to belong_to(:dependency).inverse_of(:dependency_links) }
+  end
+
+  describe 'validations' do
+    subject { create(:packages_dependency_link) }
+
+    it { is_expected.to validate_presence_of(:package) }
+    it { is_expected.to validate_presence_of(:dependency) }
+
+    context 'package_id and package_dependency_id uniqueness for dependency_type' do
+      it 'is not valid' do
+        exisiting_link = subject
+        link = build(
+          :packages_dependency_link,
+          package: exisiting_link.package,
+          dependency: exisiting_link.dependency,
+          dependency_type: exisiting_link.dependency_type
+        )
+
+        expect(link).not_to be_valid
+        expect(link.errors.to_a).to include("Dependency type has already been taken")
+      end
+    end
+  end
+
+  describe '.with_dependency_type' do
+    let_it_be(:link1) { create(:packages_dependency_link) }
+    let_it_be(:link2) { create(:packages_dependency_link, dependency: link1.dependency, dependency_type: :devDependencies) }
+    let_it_be(:link3) { create(:packages_dependency_link, dependency: link1.dependency, dependency_type: :bundleDependencies) }
+
+    subject { described_class }
+
+    it 'returns links of the given type' do
+      expect(subject.with_dependency_type(:bundleDependencies)).to eq([link3])
+    end
+  end
+end

ee/spec/models/packages/dependency_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe Packages::Dependency, type: :model do
+  describe 'relationships' do
+    it { is_expected.to have_many(:dependency_links) }
+  end
+
+  describe 'validations' do
+    subject { create(:packages_dependency) }
+
+    it { is_expected.to validate_presence_of(:name) }
+    it { is_expected.to validate_presence_of(:version_pattern) }
+    it { is_expected.to validate_uniqueness_of(:name).scoped_to(:version_pattern) }
+  end
+
+  describe '.for_package_names_and_version_patterns' do
+    let_it_be(:package_dependency1) { create(:packages_dependency, name: 'foo', version_pattern: '~1.0.0') }
+    let_it_be(:package_dependency2) { create(:packages_dependency, name: 'bar', version_pattern: '~2.5.0') }
+    let(:names_and_version_patterns) { build_names_and_version_patterns(package_dependency1, package_dependency2) }
+    let(:chunk_size) { 50 }
+    let(:rows_limit) { 50 }
+
+    subject { Packages::Dependency.for_package_names_and_version_patterns(names_and_version_patterns, chunk_size, rows_limit) }
+
+    it { is_expected.to match_array([package_dependency1, package_dependency2]) }
+
+    context 'with unknown names' do
+      let(:names_and_version_patterns) { { unknown: '~1.0.0' } }
+
+      it { is_expected.to be_empty }
+    end
+
+    context 'with unknown version patterns' do
+      let(:names_and_version_patterns) { { 'foo' => '~1.0.0beta' } }
+
+      it { is_expected.to be_empty }
+    end
+
+    context 'with a name bigger than column size' do
+      let_it_be(:big_name) { 'a' * (Packages::Dependency::MAX_STRING_LENGTH + 1) }
+      let(:names_and_version_patterns) { build_names_and_version_patterns(package_dependency1, package_dependency2).merge(big_name => '~1.0.0') }
+
+      it { is_expected.to match_array([package_dependency1, package_dependency2]) }
+    end
+
+    context 'with a version pattern bigger than column size' do
+      let_it_be(:big_version_pattern) { 'a' * (Packages::Dependency::MAX_STRING_LENGTH + 1) }
+      let(:names_and_version_patterns) { build_names_and_version_patterns(package_dependency1, package_dependency2).merge('test' => big_version_pattern) }
+
+      it { is_expected.to match_array([package_dependency1, package_dependency2]) }
+    end
+
+    context 'with too big parameter' do
+      let(:size) { (Packages::Dependency::MAX_CHUNKED_QUERIES_COUNT * chunk_size) + 1 }
+      let(:names_and_version_patterns) { Hash[(1..size).map { |v| [v, v] }] }
+
+      it { expect { subject }.to raise_error(ArgumentError, 'Too many names_and_version_patterns') }
+    end
+
+    context 'with parameters size' do
+      let_it_be(:package_dependency3) { create(:packages_dependency, name: 'foo3', version_pattern: '~1.5.3') }
+      let_it_be(:package_dependency4) { create(:packages_dependency, name: 'foo4', version_pattern: '~1.5.4') }
+      let_it_be(:package_dependency5) { create(:packages_dependency, name: 'foo5', version_pattern: '~1.5.5') }
+      let_it_be(:package_dependency6) { create(:packages_dependency, name: 'foo6', version_pattern: '~1.5.6') }
+      let_it_be(:package_dependency7) { create(:packages_dependency, name: 'foo7', version_pattern: '~1.5.7') }
+      let(:names_and_version_patterns) { build_names_and_version_patterns(package_dependency1, package_dependency2, package_dependency3, package_dependency4, package_dependency5, package_dependency6, package_dependency7) }
+
+      context 'above the chunk size' do
+        let(:chunk_size) { 2 }
+
+        it { is_expected.to match_array([package_dependency1, package_dependency2, package_dependency3, package_dependency4, package_dependency5, package_dependency6, package_dependency7]) }
+      end
+
+      context 'selecting too many rows' do
+        let(:rows_limit) { 2 }
+
+        it { expect { subject }.to raise_error(ArgumentError, 'Too many Dependencies selected') }
+      end
+    end
+
+    def build_names_and_version_patterns(*package_dependencies)
+      result = Hash.new { |h, dependency| h[dependency.name] = dependency.version_pattern }
+      package_dependencies.each { |dependency| result[dependency] }
+      result
+    end
+  end
+end

ee/spec/models/packages/package_spec.rb

@@ -7,10 +7,16 @@ RSpec.describe Packages::Package, type: :model do
   describe 'relationships' do
     it { is_expected.to belong_to(:project) }
     it { is_expected.to have_many(:package_files).dependent(:destroy) }
+    it { is_expected.to have_many(:dependency_links).inverse_of(:package) }
+    it { is_expected.to have_one(:conan_metadatum).inverse_of(:package) }
+    it { is_expected.to have_one(:maven_metadatum).inverse_of(:package) }
   end
   describe 'validations' do
+    subject { create(:package) }
+
     it { is_expected.to validate_presence_of(:project) }
+    it { is_expected.to validate_uniqueness_of(:name).scoped_to(:project_id, :version, :package_type) }
     describe '#name' do
       it { is_expected.to allow_value("my/domain/com/my-app").for(:name) }
@@ -39,6 +45,18 @@ RSpec.describe Packages::Package, type: :model do
         end
       end
     end
+
+    Packages::Package.package_types.keys.each do |pt|
+      context "project id, name, version and package type uniqueness for package type #{pt}" do
+        let(:package) { create("#{pt}_package") }
+
+        it "will not allow a #{pt} package with same project, name, version and package_type" do
+          new_package = build("#{pt}_package", project: package.project, name: package.name, version: package.version)
+          expect(new_package).not_to be_valid
+          expect(new_package.errors.to_a).to include("Name has already been taken")
+        end
+      end
+    end
   end
   describe '#destroy' do