Added models for epic board and epic board labels

This is similar to issue board labels.

changelogs/unreleased/epic_boards.yml

+---
+title: Added epic boards and epic board labels tables
+merge_request: 48658
+author:
+type: added

db/migrate/20201126165919_add_epic_boards.rb

+# frozen_string_literal: true
+
+class AddEpicBoards < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      create_table :boards_epic_boards do |t|
+        t.boolean :hide_backlog_list, default: false, null: false
+        t.boolean :hide_closed_list, default: false, null: false
+        t.references :group, index: true, foreign_key: { to_table: :namespaces, on_delete: :cascade }, null: false
+        t.timestamps_with_timezone
+        t.text :name, default: 'Development', null: false
+      end
+    end
+
+    add_text_limit :boards_epic_boards, :name, 255
+  end
+
+  def down
+    with_lock_retries do
+      drop_table :boards_epic_boards
+    end
+  end
+end

db/migrate/20201126190039_add_epic_board_labels.rb

+# frozen_string_literal: true
+
+class AddEpicBoardLabels < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      create_table :boards_epic_board_labels do |t|
+        t.references :epic_board, index: true, foreign_key: { to_table: :boards_epic_boards, on_delete: :cascade }, null: false
+        t.references :label, index: true, foreign_key: { on_delete: :cascade }, null: false
+      end
+    end
+  end
+
+  def down
+    with_lock_retries do
+      drop_table :boards_epic_board_labels
+    end
+  end
+end

db/schema_migrations/20201126165919

+a68c609800f5bdb0a77e39f706b410477493e7b7db3af11e4b2a67534df31079
\ No newline at end of file

db/schema_migrations/20201126190039

+65935afe9b4ad195aaf31cddb915dcd62b23674e278e93ce7ff9b4ae98e32331
\ No newline at end of file

db/structure.sql

@@ -9849,6 +9849,41 @@ CREATE TABLE boards (
     hide_closed_list boolean DEFAULT false NOT NULL
 );
 
+CREATE TABLE boards_epic_board_labels (
+    id bigint NOT NULL,
+    epic_board_id bigint NOT NULL,
+    label_id bigint NOT NULL
+);
+
+CREATE SEQUENCE boards_epic_board_labels_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+ALTER SEQUENCE boards_epic_board_labels_id_seq OWNED BY boards_epic_board_labels.id;
+
+CREATE TABLE boards_epic_boards (
+    id bigint NOT NULL,
+    hide_backlog_list boolean DEFAULT false NOT NULL,
+    hide_closed_list boolean DEFAULT false NOT NULL,
+    group_id bigint NOT NULL,
+    created_at timestamp with time zone NOT NULL,
+    updated_at timestamp with time zone NOT NULL,
+    name text DEFAULT 'Development'::text NOT NULL,
+    CONSTRAINT check_bcbbffe601 CHECK ((char_length(name) <= 255))
+);
+
+CREATE SEQUENCE boards_epic_boards_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+ALTER SEQUENCE boards_epic_boards_id_seq OWNED BY boards_epic_boards.id;
+
 CREATE TABLE boards_epic_user_preferences (
     id bigint NOT NULL,
     board_id bigint NOT NULL,
@@ -17876,6 +17911,10 @@ ALTER TABLE ONLY board_user_preferences ALTER COLUMN id SET DEFAULT nextval('boa
 
 ALTER TABLE ONLY boards ALTER COLUMN id SET DEFAULT nextval('boards_id_seq'::regclass);
 
+ALTER TABLE ONLY boards_epic_board_labels ALTER COLUMN id SET DEFAULT nextval('boards_epic_board_labels_id_seq'::regclass);
+
+ALTER TABLE ONLY boards_epic_boards ALTER COLUMN id SET DEFAULT nextval('boards_epic_boards_id_seq'::regclass);
+
 ALTER TABLE ONLY boards_epic_user_preferences ALTER COLUMN id SET DEFAULT nextval('boards_epic_user_preferences_id_seq'::regclass);
 
 ALTER TABLE ONLY broadcast_messages ALTER COLUMN id SET DEFAULT nextval('broadcast_messages_id_seq'::regclass);
@@ -18904,6 +18943,12 @@ ALTER TABLE ONLY board_project_recent_visits
 ALTER TABLE ONLY board_user_preferences
     ADD CONSTRAINT board_user_preferences_pkey PRIMARY KEY (id);
 
+ALTER TABLE ONLY boards_epic_board_labels
+    ADD CONSTRAINT boards_epic_board_labels_pkey PRIMARY KEY (id);
+
+ALTER TABLE ONLY boards_epic_boards
+    ADD CONSTRAINT boards_epic_boards_pkey PRIMARY KEY (id);
+
 ALTER TABLE ONLY boards_epic_user_preferences
     ADD CONSTRAINT boards_epic_user_preferences_pkey PRIMARY KEY (id);
 
@@ -20523,6 +20568,12 @@ CREATE INDEX index_board_user_preferences_on_user_id ON board_user_preferences U
 
 CREATE UNIQUE INDEX index_board_user_preferences_on_user_id_and_board_id ON board_user_preferences USING btree (user_id, board_id);
 
+CREATE INDEX index_boards_epic_board_labels_on_epic_board_id ON boards_epic_board_labels USING btree (epic_board_id);
+
+CREATE INDEX index_boards_epic_board_labels_on_label_id ON boards_epic_board_labels USING btree (label_id);
+
+CREATE INDEX index_boards_epic_boards_on_group_id ON boards_epic_boards USING btree (group_id);
+
 CREATE INDEX index_boards_epic_user_preferences_on_board_id ON boards_epic_user_preferences USING btree (board_id);
 
 CREATE UNIQUE INDEX index_boards_epic_user_preferences_on_board_user_epic_unique ON boards_epic_user_preferences USING btree (board_id, user_id, epic_id);
@@ -23842,6 +23893,9 @@ ALTER TABLE ONLY group_group_links
 ALTER TABLE ONLY geo_repository_updated_events
     ADD CONSTRAINT fk_rails_2b70854c08 FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY boards_epic_board_labels
+    ADD CONSTRAINT fk_rails_2bedeb8799 FOREIGN KEY (label_id) REFERENCES labels(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY protected_branch_unprotect_access_levels
     ADD CONSTRAINT fk_rails_2d2aba21ef FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;
 
@@ -24247,6 +24301,9 @@ ALTER TABLE ONLY slack_integrations
 ALTER TABLE ONLY custom_emoji
     ADD CONSTRAINT fk_rails_745925b412 FOREIGN KEY (namespace_id) REFERENCES namespaces(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY boards_epic_board_labels
+    ADD CONSTRAINT fk_rails_7471128a8e FOREIGN KEY (epic_board_id) REFERENCES boards_epic_boards(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY dast_site_profiles
     ADD CONSTRAINT fk_rails_747dc64abc FOREIGN KEY (dast_site_id) REFERENCES dast_sites(id) ON DELETE CASCADE;
 
@@ -24331,6 +24388,9 @@ ALTER TABLE ONLY clusters_applications_crossplane
 ALTER TABLE ONLY packages_package_file_build_infos
     ADD CONSTRAINT fk_rails_871ca3ae21 FOREIGN KEY (package_file_id) REFERENCES packages_package_files(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY boards_epic_boards
+    ADD CONSTRAINT fk_rails_874c573878 FOREIGN KEY (group_id) REFERENCES namespaces(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY ci_runner_namespaces
     ADD CONSTRAINT fk_rails_8767676b7a FOREIGN KEY (runner_id) REFERENCES ci_runners(id) ON DELETE CASCADE;
 

ee/app/models/boards.rb

+# frozen_string_literal: true
+
+module Boards
+  def self.table_name_prefix
+    'boards_'
+  end
+end

ee/app/models/boards/epic_board.rb

+# frozen_string_literal: true
+
+module Boards
+  class EpicBoard < ApplicationRecord
+    belongs_to :group, optional: false, inverse_of: :epic_boards
+    has_many :epic_board_labels, foreign_key: :epic_board_id, inverse_of: :epic_board
+
+    validates :name, length: { maximum: 255 }
+  end
+end

ee/app/models/boards/epic_board_label.rb

+# frozen_string_literal: true
+
+module Boards
+  class EpicBoardLabel < ApplicationRecord
+    belongs_to :epic_board, optional: false, inverse_of: :epic_board_labels
+    belongs_to :label, optional: false, inverse_of: :epic_board_labels
+  end
+end

ee/app/models/ee/group.rb

@@ -18,6 +18,7 @@ module EE
       add_authentication_token_field :saml_discovery_token, unique: false, token_generator: -> { Devise.friendly_token(8) }
 
       has_many :epics
+      has_many :epic_boards, class_name: 'Boards::EpicBoard', inverse_of: :group
 
       has_one :saml_provider
       has_many :scim_identities

ee/app/models/ee/label.rb

@@ -7,6 +7,10 @@ module EE
     SCOPED_LABEL_SEPARATOR = '::'
     SCOPED_LABEL_PATTERN = /^.*#{SCOPED_LABEL_SEPARATOR}/.freeze
 
+    prepended do
+      has_many :epic_board_labels, class_name: 'Boards::EpicBoardLabel', inverse_of: :label
+    end
+
     def scoped_label?
       SCOPED_LABEL_PATTERN.match?(name)
     end

ee/spec/models/boards/epic_board_label_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Boards::EpicBoardLabel do
+  describe 'associations' do
+    it { is_expected.to belong_to(:epic_board).required.inverse_of(:epic_board_labels) }
+    it { is_expected.to belong_to(:label).required.inverse_of(:epic_board_labels) }
+  end
+end

ee/spec/models/boards/epic_board_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Boards::EpicBoard do
+  describe 'associations' do
+    it { is_expected.to belong_to(:group).required.inverse_of(:epic_boards) }
+    it { is_expected.to have_many(:epic_board_labels).inverse_of(:epic_board) }
+  end
+
+  describe 'validations' do
+    it { is_expected.to validate_length_of(:name).is_at_most(255) }
+  end
+end

ee/spec/models/ee/label_spec.rb

@@ -3,6 +3,10 @@
 require 'spec_helper'
 
 RSpec.describe Label do
+  describe 'associations' do
+    it { is_expected.to have_many(:epic_board_labels).inverse_of(:label) }
+  end
+
   describe '#scoped_label?' do
     context 'with scoped_labels available' do
       before do

ee/spec/models/group_spec.rb

@@ -22,6 +22,8 @@ RSpec.describe Group do
     it { is_expected.to have_one(:group_wiki_repository) }
     it { is_expected.to belong_to(:push_rule) }
     it { is_expected.to have_many(:saml_group_links) }
+    it { is_expected.to have_many(:epics) }
+    it { is_expected.to have_many(:epic_boards).inverse_of(:group) }
 
     it_behaves_like 'model with wiki' do
       let(:container) { create(:group, :nested, :wiki_repo) }

spec/lib/gitlab/import_export/all_models.yml

@@ -86,6 +86,7 @@ label:
 - issues
 - merge_requests
 - priorities
+- epic_board_labels
 milestone:
 - group
 - project