Migrations for Cycle Analytics backend

This change lays the foundation for customizable cycle analytics stages.
The main reason for the change is to extract the event definitions to
separate objects (start_event, end_event) so that it could be easily
customized later on.

app/models/analytics/cycle_analytics.rb

+# frozen_string_literal: true
+
+module Analytics
+  module CycleAnalytics
+    def self.table_name_prefix
+      'analytics_cycle_analytics_'
+    end
+  end
+end

app/models/analytics/cycle_analytics/project_stage.rb

+# frozen_string_literal: true
+
+module Analytics
+  module CycleAnalytics
+    class ProjectStage < ApplicationRecord
+      belongs_to :project
+    end
+  end
+end

app/models/project.rb

@@ -283,6 +283,7 @@ class Project < ApplicationRecord
   has_one :ci_cd_settings, class_name: 'ProjectCiCdSetting', inverse_of: :project, autosave: true, dependent: :destroy # rubocop:disable Cop/ActiveRecordDependent
   has_many :remote_mirrors, inverse_of: :project
+  has_many :cycle_analytics_stages, class_name: 'Analytics::CycleAnalytics::ProjectStage'
   accepts_nested_attributes_for :variables, allow_destroy: true
   accepts_nested_attributes_for :project_feature, update_only: true

changelogs/unreleased/new-cycle-analytics-backend-migrations.yml

+---
+title: Create database tables for the new cycle analytics backend
+merge_request: 31621
+author:
+type: other

db/migrate/20190716144222_create_analytics_cycle_analytics_project_stages.rb

+# frozen_string_literal: true
+
+class CreateAnalyticsCycleAnalyticsProjectStages < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  INDEX_PREFIX = 'index_analytics_ca_project_stages_'
+
+  def change
+    create_table :analytics_cycle_analytics_project_stages do |t|
+      t.timestamps_with_timezone
+      t.integer :relative_position
+      t.integer :start_event_identifier, null: false
+      t.integer :end_event_identifier, null: false
+      t.references(:project, {
+        null: false,
+        foreign_key: { to_table: :projects, on_delete: :cascade },
+        index: { name: INDEX_PREFIX + 'on_project_id' }
+      })
+      t.references(:start_event_label, {
+        foreign_key: { to_table: :labels, on_delete: :cascade },
+        index: { name: INDEX_PREFIX + 'on_start_event_label_id' }
+      })
+      t.references(:end_event_label, {
+        foreign_key: { to_table: :labels, on_delete: :cascade },
+        index: { name: INDEX_PREFIX + 'on_end_event_label_id' }
+      })
+      t.boolean :hidden, default: false, null: false
+      t.boolean :custom, default: true, null: false
+      t.string :name, null: false, limit: 255
+    end
+
+    add_index :analytics_cycle_analytics_project_stages, [:project_id, :name], unique: true, name: INDEX_PREFIX + 'on_project_id_and_name'
+    add_index :analytics_cycle_analytics_project_stages, [:relative_position], name: INDEX_PREFIX + 'on_relative_position'
+  end
+end

db/migrate/20190729062536_create_analytics_cycle_analytics_group_stages.rb

+# frozen_string_literal: true
+
+class CreateAnalyticsCycleAnalyticsGroupStages < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  INDEX_PREFIX = 'index_analytics_ca_group_stages_'
+
+  def change
+    create_table :analytics_cycle_analytics_group_stages do |t|
+      t.timestamps_with_timezone
+      t.integer :relative_position
+      t.integer :start_event_identifier, null: false
+      t.integer :end_event_identifier, null: false
+      t.references(:group, {
+        null: false,
+        foreign_key: { to_table: :namespaces, on_delete: :cascade },
+        index: { name: INDEX_PREFIX + 'on_group_id' }
+      })
+      t.references(:start_event_label, {
+        foreign_key: { to_table: :labels, on_delete: :cascade },
+        index: { name: INDEX_PREFIX + 'on_start_event_label_id' }
+      })
+      t.references(:end_event_label, {
+        foreign_key: { to_table: :labels, on_delete: :cascade },
+        index: { name: INDEX_PREFIX + 'on_end_event_label_id' }
+      })
+      t.boolean :hidden, default: false, null: false
+      t.boolean :custom, default: true, null: false
+      t.string :name, null: false, limit: 255
+    end
+
+    add_index :analytics_cycle_analytics_group_stages, [:group_id, :name], unique: true, name: INDEX_PREFIX + 'on_group_id_and_name'
+    add_index :analytics_cycle_analytics_group_stages, [:relative_position], name: INDEX_PREFIX + 'on_relative_position'
+  end
+end

db/schema.rb

@@ -26,6 +26,44 @@ ActiveRecord::Schema.define(version: 2019_08_12_070645) do
     t.integer "cached_markdown_version"
   end
+  create_table "analytics_cycle_analytics_group_stages", force: :cascade do |t|
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
+    t.integer "relative_position"
+    t.integer "start_event_identifier", null: false
+    t.integer "end_event_identifier", null: false
+    t.bigint "group_id", null: false
+    t.bigint "start_event_label_id"
+    t.bigint "end_event_label_id"
+    t.boolean "hidden", default: false, null: false
+    t.boolean "custom", default: true, null: false
+    t.string "name", limit: 255, null: false
+    t.index ["end_event_label_id"], name: "index_analytics_ca_group_stages_on_end_event_label_id"
+    t.index ["group_id", "name"], name: "index_analytics_ca_group_stages_on_group_id_and_name", unique: true
+    t.index ["group_id"], name: "index_analytics_ca_group_stages_on_group_id"
+    t.index ["relative_position"], name: "index_analytics_ca_group_stages_on_relative_position"
+    t.index ["start_event_label_id"], name: "index_analytics_ca_group_stages_on_start_event_label_id"
+  end
+
+  create_table "analytics_cycle_analytics_project_stages", force: :cascade do |t|
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
+    t.integer "relative_position"
+    t.integer "start_event_identifier", null: false
+    t.integer "end_event_identifier", null: false
+    t.bigint "project_id", null: false
+    t.bigint "start_event_label_id"
+    t.bigint "end_event_label_id"
+    t.boolean "hidden", default: false, null: false
+    t.boolean "custom", default: true, null: false
+    t.string "name", limit: 255, null: false
+    t.index ["end_event_label_id"], name: "index_analytics_ca_project_stages_on_end_event_label_id"
+    t.index ["project_id", "name"], name: "index_analytics_ca_project_stages_on_project_id_and_name", unique: true
+    t.index ["project_id"], name: "index_analytics_ca_project_stages_on_project_id"
+    t.index ["relative_position"], name: "index_analytics_ca_project_stages_on_relative_position"
+    t.index ["start_event_label_id"], name: "index_analytics_ca_project_stages_on_start_event_label_id"
+  end
+
   create_table "appearances", id: :serial, force: :cascade do |t|
     t.string "title", null: false
     t.text "description", null: false
@@ -3632,6 +3670,12 @@ ActiveRecord::Schema.define(version: 2019_08_12_070645) do
     t.index ["type"], name: "index_web_hooks_on_type"
   end
+  add_foreign_key "analytics_cycle_analytics_group_stages", "labels", column: "end_event_label_id", on_delete: :cascade
+  add_foreign_key "analytics_cycle_analytics_group_stages", "labels", column: "start_event_label_id", on_delete: :cascade
+  add_foreign_key "analytics_cycle_analytics_group_stages", "namespaces", column: "group_id", on_delete: :cascade
+  add_foreign_key "analytics_cycle_analytics_project_stages", "labels", column: "end_event_label_id", on_delete: :cascade
+  add_foreign_key "analytics_cycle_analytics_project_stages", "labels", column: "start_event_label_id", on_delete: :cascade
+  add_foreign_key "analytics_cycle_analytics_project_stages", "projects", on_delete: :cascade
   add_foreign_key "application_settings", "namespaces", column: "custom_project_templates_group_id", on_delete: :nullify
   add_foreign_key "application_settings", "projects", column: "file_template_project_id", name: "fk_ec757bd087", on_delete: :nullify
   add_foreign_key "application_settings", "projects", column: "instance_administration_project_id", on_delete: :nullify

spec/lib/gitlab/import_export/all_models.yml

@@ -242,6 +242,7 @@ project:
 - cluster_project
 - cluster_ingresses
 - creator
+- cycle_analytics_stages
 - group
 - namespace
 - boards

spec/models/analytics/cycle_analytics/project_stage_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Analytics::CycleAnalytics::ProjectStage do
+  describe 'associations' do
+    it { is_expected.to belong_to(:project) }
+  end
+end

spec/models/project_spec.rb

@@ -98,6 +98,7 @@ describe Project do
     it { is_expected.to have_many(:lfs_file_locks) }
     it { is_expected.to have_many(:project_deploy_tokens) }
     it { is_expected.to have_many(:deploy_tokens).through(:project_deploy_tokens) }
+    it { is_expected.to have_many(:cycle_analytics_stages) }
     it 'has an inverse relationship with merge requests' do
       expect(described_class.reflect_on_association(:merge_requests).has_inverse?).to eq(:target_project)