Add ResourceStateEvent model

Also extended specs

app/models/concerns/state_eventable.rb

+# frozen_string_literal: true
+
+module StateEventable
+  extend ActiveSupport::Concern
+
+  included do
+    has_many :resource_state_events
+  end
+end

app/models/issue.rb

@@ -17,6 +17,7 @@ class Issue < ApplicationRecord
   include IgnorableColumns
   include MilestoneEventable
   include WhereComposite
+  include StateEventable
 
   DueDateStruct                   = Struct.new(:title, :name).freeze
   NoDueDate                       = DueDateStruct.new('No Due Date', '0').freeze

app/models/merge_request.rb

@@ -19,6 +19,7 @@ class MergeRequest < ApplicationRecord
   include ShaAttribute
   include IgnorableColumns
   include MilestoneEventable
+  include StateEventable
 
   sha_attribute :squash_commit_sha
 

app/models/resource_state_event.rb

+# frozen_string_literal: true
+
+class ResourceStateEvent < ResourceEvent
+  include IssueResourceEvent
+  include MergeRequestResourceEvent
+
+  validate :exactly_one_issuable
+
+  # state is used for issue and merge request states.
+  enum state: Issue.available_states.merge(MergeRequest.available_states).merge(reopened: 5)
+
+  def self.issuable_attrs
+    %i(issue merge_request).freeze
+  end
+end

app/services/issuable/clone/attributes_rewriter.rb

@@ -20,6 +20,7 @@ module Issuable
         copy_resource_label_events
         copy_resource_weight_events
         copy_resource_milestone_events
+        copy_resource_state_events
       end
 
       private
@@ -47,8 +48,6 @@ module Issuable
       end
 
       def copy_resource_label_events
-        entity_key = new_entity.class.name.underscore.foreign_key
-
         copy_events(ResourceLabelEvent.table_name, original_entity.resource_label_events) do |event|
           event.attributes
             .except('id', 'reference', 'reference_html')
@@ -80,9 +79,18 @@ module Issuable
         end
       end
 
-      def event_attributes_with_milestone(event, milestone)
-        entity_key = new_entity.class.name.underscore.foreign_key
+      def copy_resource_state_events
+        return unless state_events_supported?
+
+        copy_events(ResourceStateEvent.table_name, original_entity.resource_state_events) do |event|
+          event.attributes
+            .except('id')
+            .merge(entity_key => new_entity.id,
+                   'state' => ResourceStateEvent.states[event.state])
+        end
+      end
 
+      def event_attributes_with_milestone(event, milestone)
         event.attributes
           .except('id')
           .merge(entity_key => new_entity.id,
@@ -102,12 +110,20 @@ module Issuable
       end
 
       def entity_key
-        new_entity.class.name.parameterize('_').foreign_key
+        new_entity.class.name.underscore.foreign_key
       end
 
       def milestone_events_supported?
-        original_entity.respond_to?(:resource_milestone_events) &&
-          new_entity.respond_to?(:resource_milestone_events)
+        both_respond_to?(:resource_milestone_events)
+      end
+
+      def state_events_supported?
+        both_respond_to?(:resource_state_events)
+      end
+
+      def both_respond_to?(method)
+        original_entity.respond_to?(method) &&
+          new_entity.respond_to?(method)
       end
     end
   end

ee/spec/models/issue_spec.rb

@@ -7,6 +7,18 @@ describe Issue do
 
   using RSpec::Parameterized::TableSyntax
 
+  describe 'associations' do
+    subject { build(:issue) }
+
+    it { is_expected.to have_many(:resource_weight_events) }
+  end
+
+  describe 'modules' do
+    subject { build(:issue) }
+
+    it { is_expected.to include_module(EE::WeightEventable) }
+  end
+
   context 'callbacks' do
     describe '.after_create' do
       let_it_be(:project) { create(:project) }

spec/factories/resource_state_event.rb

+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :resource_state_event do
+    issue { merge_request.nil? ? create(:issue) : nil }
+    merge_request { nil }
+    state { :opened }
+    user { issue&.author || merge_request&.author || create(:user) }
+  end
+end

spec/lib/gitlab/import_export/all_models.yml

@@ -11,6 +11,7 @@ issues:
 - resource_label_events
 - resource_weight_events
 - resource_milestone_events
+- resource_state_events
 - sent_notifications
 - sentry_issue
 - label_links
@@ -119,6 +120,7 @@ merge_requests:
 - notes
 - resource_label_events
 - resource_milestone_events
+- resource_state_events
 - label_links
 - labels
 - last_edited_by

spec/models/issue_spec.rb

@@ -19,6 +19,8 @@ describe Issue do
     it { is_expected.to have_many(:design_versions) }
     it { is_expected.to have_one(:sentry_issue) }
     it { is_expected.to have_one(:alert_management_alert) }
+    it { is_expected.to have_many(:resource_milestone_events) }
+    it { is_expected.to have_many(:resource_state_events) }
 
     describe 'versions.most_recent' do
       it 'returns the most recent version' do
@@ -38,6 +40,8 @@ describe Issue do
     it { is_expected.to include_module(Referable) }
     it { is_expected.to include_module(Sortable) }
     it { is_expected.to include_module(Taskable) }
+    it { is_expected.to include_module(MilestoneEventable) }
+    it { is_expected.to include_module(StateEventable) }
 
     it_behaves_like 'AtomicInternalId' do
       let(:internal_id_attribute) { :iid }

spec/models/merge_request_spec.rb

@@ -20,6 +20,8 @@ describe MergeRequest do
     it { is_expected.to have_many(:user_mentions).class_name("MergeRequestUserMention") }
     it { is_expected.to belong_to(:milestone) }
     it { is_expected.to belong_to(:sprint) }
+    it { is_expected.to have_many(:resource_milestone_events) }
+    it { is_expected.to have_many(:resource_state_events) }
 
     context 'for forks' do
       let!(:project) { create(:project) }
@@ -178,6 +180,8 @@ describe MergeRequest do
     it { is_expected.to include_module(Referable) }
     it { is_expected.to include_module(Sortable) }
     it { is_expected.to include_module(Taskable) }
+    it { is_expected.to include_module(MilestoneEventable) }
+    it { is_expected.to include_module(StateEventable) }
 
     it_behaves_like 'AtomicInternalId' do
       let(:internal_id_attribute) { :iid }

spec/models/resource_state_event_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ResourceStateEvent, type: :model do
+  subject { build(:resource_state_event, issue: issue) }
+
+  let(:issue) { create(:issue) }
+  let(:merge_request) { create(:merge_request) }
+
+  it_behaves_like 'a resource event'
+  it_behaves_like 'a resource event for issues'
+  it_behaves_like 'a resource event for merge requests'
+end

spec/services/issuable/clone/attributes_rewriter_spec.rb

@@ -114,5 +114,27 @@ describe Issuable::Clone::AttributesRewriter do
         expect(event.state).to eq(expected_attrs[:state])
       end
     end
+
+    context 'with existing state events' do
+      let!(:event1) { create(:resource_state_event, issue: original_issue, state: 'opened') }
+      let!(:event2) { create(:resource_state_event, issue: original_issue, state: 'closed') }
+      let!(:event3) { create(:resource_state_event, issue: original_issue, state: 'reopened') }
+
+      it 'copies existing state events as expected' do
+        subject.execute
+
+        state_events = new_issue.reload.resource_state_events
+        expect(state_events.size).to eq(3)
+
+        expect_state_event(state_events.first, issue: new_issue, state: 'opened')
+        expect_state_event(state_events.second, issue: new_issue, state: 'closed')
+        expect_state_event(state_events.third, issue: new_issue, state: 'reopened')
+      end
+
+      def expect_state_event(event, expected_attrs)
+        expect(event.issue_id).to eq(expected_attrs[:issue]&.id)
+        expect(event.state).to eq(expected_attrs[:state])
+      end
+    end
   end
 end