Create an event on epic actions

Creates new event when an epic is created, closed, reopened or
commented.

app/models/board.rb

@@ -19,6 +19,7 @@ class Board < ApplicationRecord
   def parent
     @parent ||= group || project
   end
+  alias_method :resource_parent, :parent
   def group_board?
     group_id.present?

app/models/concerns/issuable.rb

@@ -277,6 +277,10 @@ module Issuable
     end
   end
+  def resource_parent
+    project
+  end
+
   def milestone_available?
     project_id == milestone&.project_id || project.ancestors_upto.compact.include?(milestone&.group)
   end

app/models/event.rb

@@ -51,6 +51,7 @@ class Event < ApplicationRecord
   belongs_to :author, class_name: "User"
   belongs_to :project
+  belongs_to :group
   belongs_to :target, -> {
     # If the association for "target" defines an "author" association we want to

app/models/milestone.rb

@@ -260,6 +260,7 @@ class Milestone < ApplicationRecord
   def parent
     group || project
   end
+  alias_method :resource_parent, :parent
   def group_milestone?
     group_id.present?

app/models/note.rb

@@ -477,6 +477,7 @@ class Note < ApplicationRecord
   def parent
     project
   end
+  alias_method :resource_parent, :parent
   private

app/models/todo.rb

@@ -146,6 +146,7 @@ class Todo < ApplicationRecord
   def parent
     project
   end
+  alias_method :resource_parent, :parent
   def unmergeable?
     action == UNMERGEABLE

app/services/event_create_service.rb

@@ -95,16 +95,23 @@ class EventCreateService
   private
   def create_record_event(record, current_user, status)
-    create_event(record.project, current_user, status, target_id: record.id, target_type: record.class.name)
+    create_event(record.resource_parent, current_user, status, target_id: record.id, target_type: record.class.name)
   end
-  def create_event(project, current_user, status, attributes = {})
+  def create_event(resource_parent, current_user, status, attributes = {})
     attributes.reverse_merge!(
-      project: project,
       action: status,
       author_id: current_user.id
     )
+    resource_parent_attr = case resource_parent
+                           when Project
+                             :project
+                           when Group
+                             :group
+                           end
+    attributes[resource_parent_attr] = resource_parent if resource_parent_attr
+
     Event.create!(attributes)
   end
 end

db/migrate/20190826100605_add_group_column_to_events.rb

+# frozen_string_literal: true
+
+class AddGroupColumnToEvents < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  def change
+    add_reference :events, :group, index: true, foreign_key: { to_table: :namespaces, on_delete: :cascade }
+  end
+end

db/schema.rb

@@ -1310,9 +1310,11 @@ ActiveRecord::Schema.define(version: 2019_09_02_160015) do
     t.datetime_with_timezone "updated_at", null: false
     t.integer "action", limit: 2, null: false
     t.string "target_type"
+    t.bigint "group_id"
     t.index ["action"], name: "index_events_on_action"
     t.index ["author_id", "project_id"], name: "index_events_on_author_id_and_project_id"
     t.index ["created_at", "author_id"], name: "analytics_index_events_on_created_at_and_author_id"
+    t.index ["group_id"], name: "index_events_on_group_id"
     t.index ["project_id", "created_at"], name: "index_events_on_project_id_and_created_at"
     t.index ["project_id", "id"], name: "index_events_on_project_id_and_id"
     t.index ["target_type", "target_id"], name: "index_events_on_target_type_and_target_id"
@@ -3838,6 +3840,7 @@ ActiveRecord::Schema.define(version: 2019_09_02_160015) do
   add_foreign_key "epics", "users", column: "assignee_id", name: "fk_dccd3f98fc", on_delete: :nullify
   add_foreign_key "epics", "users", column: "author_id", name: "fk_3654b61b03", on_delete: :cascade
   add_foreign_key "epics", "users", column: "closed_by_id", name: "fk_aa5798e761", on_delete: :nullify
+  add_foreign_key "events", "namespaces", column: "group_id", on_delete: :cascade
   add_foreign_key "events", "projects", on_delete: :cascade
   add_foreign_key "events", "users", column: "author_id", name: "fk_edfd187b6f", on_delete: :cascade
   add_foreign_key "fork_network_members", "fork_networks", on_delete: :cascade

spec/lib/gitlab/import_export/all_models.yml

@@ -26,6 +26,7 @@ issues:
 events:
 - author
 - project
+- group
 - target
 - push_event_payload
 notes:

spec/lib/gitlab/import_export/safe_model_attributes.yml

@@ -33,6 +33,7 @@ Event:
 - target_type
 - target_id
 - project_id
+- group_id
 - created_at
 - updated_at
 - action