Merge branch 'events-migration-cleanup' into 'master'

Finish migration to the new events setup

Closes #37241

See merge request !13932

app/models/event.rb

 class Event < ActiveRecord::Base
   include Sortable
+  include IgnorableColumn
   default_scope { reorder(nil).where.not(author_id: nil) }
 
   CREATED   = 1
@@ -50,13 +51,9 @@ class Event < ActiveRecord::Base
   belongs_to :target, polymorphic: true # rubocop:disable Cop/PolymorphicAssociations
   has_one :push_event_payload, foreign_key: :event_id
 
-  # For Hash only
-  serialize :data # rubocop:disable Cop/ActiveRecordSerialize
-
   # Callbacks
   after_create :reset_project_activity
   after_create :set_last_repository_updated_at, if: :push?
-  after_create :replicate_event_for_push_events_migration
 
   # Scopes
   scope :recent, -> { reorder(id: :desc) }
@@ -82,6 +79,10 @@ class Event < ActiveRecord::Base
 
   self.inheritance_column = 'action'
 
+  # "data" will be removed in 10.0 but it may be possible that JOINs happen that
+  # include this column, hence we're ignoring it as well.
+  ignore_column :data
+
   class << self
     def model_name
       ActiveModel::Name.new(self, nil, 'event')
@@ -159,7 +160,7 @@ class Event < ActiveRecord::Base
   end
 
   def push?
-    action == PUSHED && valid_push?
+    false
   end
 
   def merged?
@@ -272,87 +273,6 @@ class Event < ActiveRecord::Base
     end
   end
 
-  def valid_push?
-    data[:ref] && ref_name.present?
-  rescue
-    false
-  end
-
-  def tag?
-    Gitlab::Git.tag_ref?(data[:ref])
-  end
-
-  def branch?
-    Gitlab::Git.branch_ref?(data[:ref])
-  end
-
-  def new_ref?
-    Gitlab::Git.blank_ref?(commit_from)
-  end
-
-  def rm_ref?
-    Gitlab::Git.blank_ref?(commit_to)
-  end
-
-  def md_ref?
-    !(rm_ref? || new_ref?)
-  end
-
-  def commit_from
-    data[:before]
-  end
-
-  def commit_to
-    data[:after]
-  end
-
-  def ref_name
-    if tag?
-      tag_name
-    else
-      branch_name
-    end
-  end
-
-  def branch_name
-    @branch_name ||= Gitlab::Git.ref_name(data[:ref])
-  end
-
-  def tag_name
-    @tag_name ||= Gitlab::Git.ref_name(data[:ref])
-  end
-
-  # Max 20 commits from push DESC
-  def commits
-    @commits ||= (data[:commits] || []).reverse
-  end
-
-  def commit_title
-    commit = commits.last
-
-    commit[:message] if commit
-  end
-
-  def commit_id
-    commit_to || commit_from
-  end
-
-  def commits_count
-    data[:total_commits_count] || commits.count || 0
-  end
-
-  def ref_type
-    tag? ? "tag" : "branch"
-  end
-
-  def push_with_commits?
-    !commits.empty? && commit_from && commit_to
-  end
-
-  def last_push_to_non_root?
-    branch? && project.default_branch != branch_name
-  end
-
   def target_iid
     target.respond_to?(:iid) ? target.iid : target_id
   end
@@ -432,16 +352,6 @@ class Event < ActiveRecord::Base
     user ? author_id == user.id : false
   end
 
-  # We're manually replicating data into the new table since database triggers
-  # are not dumped to db/schema.rb. This could mean that a new installation
-  # would not have the triggers in place, thus losing events data in GitLab
-  # 10.0.
-  def replicate_event_for_push_events_migration
-    new_attributes = attributes.with_indifferent_access.except(:title, :data)
-
-    EventForMigration.create!(new_attributes)
-  end
-
   def to_partial_path
     # We are intentionally using `Event` rather than `self.class` so that
     # subclasses also use the `Event` implementation.

app/models/event_for_migration.rb

-# This model is used to replicate events between the old "events" table and the
-# new "events_for_migration" table that will replace "events" in GitLab 10.0.
-class EventForMigration < ActiveRecord::Base
-  self.table_name = 'events_for_migration'
-end

app/models/push_event.rb

@@ -15,15 +15,21 @@ class PushEvent < Event
   # should ensure the ID points to a valid project.
   validates :project_id, presence: true
 
-  # The "data" field must not be set for push events since it's not used and a
-  # waste of space.
-  validates :data, absence: true
-
   # These fields are also not used for push events, thus storing them would be a
   # waste.
   validates :target_id, absence: true
   validates :target_type, absence: true
 
+  delegate :branch?, to: :push_event_payload
+  delegate :tag?, to: :push_event_payload
+  delegate :commit_from, to: :push_event_payload
+  delegate :commit_to, to: :push_event_payload
+  delegate :ref_type, to: :push_event_payload
+  delegate :commit_title, to: :push_event_payload
+
+  delegate :commit_count, to: :push_event_payload
+  alias_method :commits_count, :commit_count
+
   def self.sti_name
     PUSHED
   end
@@ -36,86 +42,35 @@ class PushEvent < Event
     !!(commit_from && commit_to)
   end
 
-  def tag?
-    return super unless push_event_payload
-
-    push_event_payload.tag?
-  end
-
-  def branch?
-    return super unless push_event_payload
-
-    push_event_payload.branch?
-  end
-
   def valid_push?
-    return super unless push_event_payload
-
     push_event_payload.ref.present?
   end
 
   def new_ref?
-    return super unless push_event_payload
-
     push_event_payload.created?
   end
 
   def rm_ref?
-    return super unless push_event_payload
-
     push_event_payload.removed?
   end
 
-  def commit_from
-    return super unless push_event_payload
-
-    push_event_payload.commit_from
-  end
-
-  def commit_to
-    return super unless push_event_payload
-
-    push_event_payload.commit_to
+  def md_ref?
+    !(rm_ref? || new_ref?)
   end
 
   def ref_name
-    return super unless push_event_payload
-
     push_event_payload.ref
   end
 
-  def ref_type
-    return super unless push_event_payload
-
-    push_event_payload.ref_type
-  end
-
-  def branch_name
-    return super unless push_event_payload
-
-    ref_name
-  end
-
-  def tag_name
-    return super unless push_event_payload
-
-    ref_name
-  end
-
-  def commit_title
-    return super unless push_event_payload
-
-    push_event_payload.commit_title
-  end
+  alias_method :branch_name, :ref_name
+  alias_method :tag_name, :ref_name
 
   def commit_id
     commit_to || commit_from
   end
 
-  def commits_count
-    return super unless push_event_payload
-
-    push_event_payload.commit_count
+  def last_push_to_non_root?
+    branch? && project.default_branch != branch_name
   end
 
   def validate_push_action

changelogs/unreleased/events-migration-cleanup.yml

+---
+title: Finish migration to the new events setup
+merge_request:
+author:
+type: changed

db/migrate/20170830130119_steal_remaining_event_migration_jobs.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class StealRemainingEventMigrationJobs < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    Gitlab::BackgroundMigration.steal('MigrateEventsToPushEventPayloads')
+  end
+
+  def down
+  end
+end

db/migrate/20170830131015_swap_event_migration_tables.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class SwapEventMigrationTables < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  def up
+    rename_tables
+  end
+
+  def down
+    rename_tables
+  end
+
+  def rename_tables
+    rename_table :events, :events_old
+    rename_table :events_for_migration, :events
+    rename_table :events_old, :events_for_migration
+  end
+end

db/migrate/limits_to_mysql.rb

@@ -7,6 +7,5 @@ class LimitsToMysql < ActiveRecord::Migration
     change_column :merge_request_diffs, :st_diffs, :text, limit: 2147483647
     change_column :snippets, :content, :text, limit: 2147483647
     change_column :notes, :st_diff, :text, limit: 2147483647
-    change_column :events, :data, :text, limit: 2147483647
   end
 end

db/post_migrate/20170830150306_drop_events_for_migration_table.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class DropEventsForMigrationTable < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  class Event < ActiveRecord::Base
+    include EachBatch
+  end
+
+  def up
+    transaction do
+      drop_table :events_for_migration
+    end
+  end
+
+  # rubocop: disable Migration/Datetime
+  def down
+    create_table :events_for_migration do |t|
+      t.string :target_type, index: true
+      t.integer :target_id, index: true
+      t.string :title
+      t.text :data
+      t.integer :project_id
+      t.datetime :created_at, index: true
+      t.datetime :updated_at
+      t.integer :action, index: true
+      t.integer :author_id, index: true
+
+      t.index [:project_id, :id]
+    end
+
+    Event.all.each_batch do |relation|
+      start_id, stop_id = relation.pluck('MIN(id), MAX(id)').first
+
+      execute <<-EOF.strip_heredoc
+      INSERT INTO events_for_migration (target_type, target_id, project_id, created_at, updated_at, action, author_id)
+      SELECT target_type, target_id, project_id, created_at, updated_at, action, author_id
+      FROM events
+      WHERE id BETWEEN #{start_id} AND #{stop_id}
+      EOF
+    end
+  end
+end

db/schema.rb

@@ -532,25 +532,6 @@ ActiveRecord::Schema.define(version: 20170905112933) do
   add_index "environments", ["project_id", "slug"], name: "index_environments_on_project_id_and_slug", unique: true, using: :btree
 
   create_table "events", force: :cascade do |t|
-    t.string "target_type"
-    t.integer "target_id"
-    t.string "title"
-    t.text "data"
-    t.integer "project_id"
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.integer "action"
-    t.integer "author_id"
-  end
-
-  add_index "events", ["action"], name: "index_events_on_action", using: :btree
-  add_index "events", ["author_id"], name: "index_events_on_author_id", using: :btree
-  add_index "events", ["created_at"], name: "index_events_on_created_at", using: :btree
-  add_index "events", ["project_id", "id"], name: "index_events_on_project_id_and_id", using: :btree
-  add_index "events", ["target_id"], name: "index_events_on_target_id", using: :btree
-  add_index "events", ["target_type"], name: "index_events_on_target_type", using: :btree
-
-  create_table "events_for_migration", force: :cascade do |t|
     t.integer "project_id"
     t.integer "author_id", null: false
     t.integer "target_id"
@@ -560,10 +541,10 @@ ActiveRecord::Schema.define(version: 20170905112933) do
     t.string "target_type"
   end
 
-  add_index "events_for_migration", ["action"], name: "index_events_for_migration_on_action", using: :btree
-  add_index "events_for_migration", ["author_id"], name: "index_events_for_migration_on_author_id", using: :btree
-  add_index "events_for_migration", ["project_id", "id"], name: "index_events_for_migration_on_project_id_and_id", using: :btree
-  add_index "events_for_migration", ["target_type", "target_id"], name: "index_events_for_migration_on_target_type_and_target_id", using: :btree
+  add_index "events", ["action"], name: "index_events_on_action", using: :btree
+  add_index "events", ["author_id"], name: "index_events_on_author_id", using: :btree
+  add_index "events", ["project_id", "id"], name: "index_events_on_project_id_and_id", using: :btree
+  add_index "events", ["target_type", "target_id"], name: "index_events_on_target_type_and_target_id", using: :btree
 
   create_table "feature_gates", force: :cascade do |t|
     t.string "feature_key", null: false
@@ -1708,9 +1689,8 @@ ActiveRecord::Schema.define(version: 20170905112933) do
   add_foreign_key "deploy_keys_projects", "projects", name: "fk_58a901ca7e", on_delete: :cascade
   add_foreign_key "deployments", "projects", name: "fk_b9a3851b82", on_delete: :cascade
   add_foreign_key "environments", "projects", name: "fk_d1c8c1da6a", on_delete: :cascade
-  add_foreign_key "events", "projects", name: "fk_0434b48643", on_delete: :cascade
-  add_foreign_key "events_for_migration", "projects", on_delete: :cascade
-  add_foreign_key "events_for_migration", "users", column: "author_id", name: "fk_edfd187b6f", 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 "forked_project_links", "projects", column: "forked_to_project_id", name: "fk_434510edb0", on_delete: :cascade
   add_foreign_key "gpg_keys", "users", on_delete: :cascade
   add_foreign_key "gpg_signatures", "gpg_keys", on_delete: :nullify
@@ -1754,7 +1734,7 @@ ActiveRecord::Schema.define(version: 20170905112933) do
   add_foreign_key "protected_tag_create_access_levels", "protected_tags", name: "fk_f7dfda8c51", on_delete: :cascade
   add_foreign_key "protected_tag_create_access_levels", "users"
   add_foreign_key "protected_tags", "projects", name: "fk_8e4af87648", on_delete: :cascade
-  add_foreign_key "push_event_payloads", "events_for_migration", column: "event_id", name: "fk_36c74129da", on_delete: :cascade
+  add_foreign_key "push_event_payloads", "events", name: "fk_36c74129da", on_delete: :cascade
   add_foreign_key "releases", "projects", name: "fk_47fe2a0596", on_delete: :cascade
   add_foreign_key "services", "projects", name: "fk_71cce407f9", on_delete: :cascade
   add_foreign_key "snippets", "projects", name: "fk_be41fd4bb7", on_delete: :cascade

doc/user/project/settings/import_export.md

@@ -29,8 +29,9 @@ with all their related data and be moved into a new GitLab instance.
 ## Version history
 
 | GitLab version   | Import/Export version |
-| -------- | -------- |
-| 9.4.0 to current | 0.1.8 |
+| ---------------- | --------------------- |
+| 10.0 to current  | 0.2.0                 |
+| 9.4.0            | 0.1.8                 |
 | 9.2.0            | 0.1.7                 |
 | 8.17.0           | 0.1.6                 |
 | 8.13.0           | 0.1.5                 |

features/steps/user.rb

@@ -17,14 +17,9 @@ class Spinach::Features::User < Spinach::FeatureSteps
     Issues::CreateService.new(project, user, issue_params).execute
 
     # Push code contribution
-    push_params = {
-      project: project,
-      action: Event::PUSHED,
-      author_id: user.id,
-      data: { commit_count: 3 }
-    }
-
-    Event.create(push_params)
+    event = create(:push_event, project: project, author: user)
+
+    create(:push_event_payload, event: event, commit_count: 3)
   end
 
   step 'I should see contributed projects' do
@@ -38,6 +33,6 @@ class Spinach::Features::User < Spinach::FeatureSteps
   end
 
   def contributed_project
-    @contributed_project ||= create(:project, :public)
+    @contributed_project ||= create(:project, :public, :empty_repo)
   end
 end

lib/api/entities.rb

@@ -557,7 +557,7 @@ module API
     end
 
     class Event < Grape::Entity
-      expose :title, :project_id, :action_name
+      expose :project_id, :action_name
       expose :target_id, :target_iid, :target_type, :author_id
       expose :target_title
       expose :created_at

lib/api/v3/entities.rb

@@ -31,7 +31,7 @@ module API
       end
 
       class Event < Grape::Entity
-        expose :title, :project_id, :action_name
+        expose :project_id, :action_name
         expose :target_id, :target_type, :author_id
         expose :target_title
         expose :created_at

lib/gitlab/import_export.rb

@@ -3,7 +3,7 @@ module Gitlab
     extend self
 
     # For every version update, the version history in import_export.md has to be kept up to date.
-    VERSION = '0.1.8'.freeze
+    VERSION = '0.2.0'.freeze
     FILENAME_LIMIT = 50
 
     def export_path(relative_path:)

lib/gitlab/import_export/relation_factory.rb

@@ -69,7 +69,6 @@ module Gitlab
         reset_tokens!
         remove_encrypted_attributes!
 
-        @relation_hash['data'].deep_symbolize_keys! if @relation_name == :events && @relation_hash['data']
         set_st_diff_commits if @relation_name == :merge_request_diff
         set_diff if @relation_name == :merge_request_diff_files
       end

lib/tasks/gitlab/import_export.rake

@@ -9,5 +9,16 @@ namespace :gitlab do
     task data: :environment do
       puts YAML.load_file(Gitlab::ImportExport.config_file)['project_tree'].to_yaml(SortKeys: true)
     end
+
+    desc 'GitLab | Bumps the Import/Export version for test_project_export.tar.gz'
+    task bump_test_version: :environment do
+      Dir.mktmpdir do |tmp_dir|
+        system("tar -zxf spec/features/projects/import_export/test_project_export.tar.gz -C #{tmp_dir} > /dev/null")
+        File.write(File.join(tmp_dir, 'VERSION'), Gitlab::ImportExport.version, mode: 'w')
+        system("tar -zcvf spec/features/projects/import_export/test_project_export.tar.gz -C #{tmp_dir} . > /dev/null")
+      end
+
+      puts "Updated to #{Gitlab::ImportExport.version}"
+    end
   end
 end

spec/features/dashboard/projects_spec.rb

@@ -84,25 +84,11 @@ feature 'Dashboard Projects' do
   end
 
   context 'last push widget' do
-    let(:push_event_data) do
-      {
-        before: Gitlab::Git::BLANK_SHA,
-        after: '0220c11b9a3e6c69dc8fd35321254ca9a7b98f7e',
-        ref: 'refs/heads/feature',
-        user_id: user.id,
-        user_name: user.name,
-        repository: {
-          name: project.name,
-          url: 'localhost/rubinius',
-          description: '',
-          homepage: 'localhost/rubinius',
-          private: true
-        }
-      }
-    end
-    let!(:push_event) { create(:event, :pushed, data: push_event_data, project: project, author: user) }
-
     before do
+      event = create(:push_event, project: project, author: user)
+
+      create(:push_event_payload, event: event, ref: 'feature', action: :created)
+
       visit dashboard_projects_path
     end
 

spec/lib/gitlab/background_migration/migrate_events_to_push_event_payloads_spec.rb

 require 'spec_helper'
 
-describe Gitlab::BackgroundMigration::MigrateEventsToPushEventPayloads::Event do
+describe Gitlab::BackgroundMigration::MigrateEventsToPushEventPayloads::Event, :migration, schema: 20170608152748 do
   describe '#commit_title' do
     it 'returns nil when there are no commits' do
       expect(described_class.new.commit_title).to be_nil

spec/lib/gitlab/import_export/project.json

@@ -75,8 +75,6 @@
             "id": 487,
             "target_type": "Milestone",
             "target_id": 1,
-            "title": null,
-            "data": null,
             "project_id": 46,
             "created_at": "2016-06-14T15:02:04.418Z",
             "updated_at": "2016-06-14T15:02:04.418Z",
@@ -364,8 +362,6 @@
             "id": 487,
             "target_type": "Milestone",
             "target_id": 1,
-            "title": null,
-            "data": null,
             "project_id": 46,
             "created_at": "2016-06-14T15:02:04.418Z",
             "updated_at": "2016-06-14T15:02:04.418Z",
@@ -2311,8 +2307,6 @@
           "id": 487,
           "target_type": "Milestone",
           "target_id": 1,
-          "title": null,
-          "data": null,
           "project_id": 46,
           "created_at": "2016-06-14T15:02:04.418Z",
           "updated_at": "2016-06-14T15:02:04.418Z",
@@ -2336,8 +2330,6 @@
           "id": 240,
           "target_type": "Milestone",
           "target_id": 20,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:04.593Z",
           "updated_at": "2016-06-14T15:02:04.593Z",
@@ -2348,8 +2340,6 @@
           "id": 60,
           "target_type": "Milestone",
           "target_id": 20,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:04.593Z",
           "updated_at": "2016-06-14T15:02:04.593Z",
@@ -2373,8 +2363,6 @@
           "id": 241,
           "target_type": "Milestone",
           "target_id": 19,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:04.585Z",
           "updated_at": "2016-06-14T15:02:04.585Z",
@@ -2385,41 +2373,6 @@
           "id": 59,
           "target_type": "Milestone",
           "target_id": 19,
-          "title": null,
-          "data": {
-            "object_kind": "push",
-            "before": "0000000000000000000000000000000000000000",
-            "after": "de990aa15829d0ab182ad5a55b4c527846c0d39c",
-            "ref": "refs/heads/removable-group-owner",
-            "checkout_sha": "de990aa15829d0ab182ad5a55b4c527846c0d39c",
-            "message": null,
-            "user_id": 273486,
-            "user_name": "James Lopez",
-            "user_email": "james@jameslopez.es",
-            "project_id": 562317,
-            "repository": {
-              "name": "GitLab Community Edition",
-              "url": "git@gitlab.com:james11/gitlab-ce.git",
-              "description": "Version Control on your Server. See http://gitlab.org/gitlab-ce/ and the README for more information",
-              "homepage": "https://gitlab.com/james11/gitlab-ce",
-              "git_http_url": "https://gitlab.com/james11/gitlab-ce.git",
-              "git_ssh_url": "git@gitlab.com:james11/gitlab-ce.git",
-              "visibility_level": 20
-            },
-            "commits": [
-              {
-                "id": "de990aa15829d0ab182ad5a55b4c527846c0d39c",
-                "message": "fixed last group owner issue and added test\\n",
-                "timestamp": "2015-10-29T16:10:27+00:00",
-                "url": "https://gitlab.com/james11/gitlab-ce/commit/de990aa15829d0ab182ad5a55b4c527846c0d39c",
-                "author": {
-                  "name": "James Lopez",
-                  "email": "james.lopez@vodafone.com"
-                }
-              }
-            ],
-            "total_commits_count": 1
-          },
           "project_id": 5,
           "created_at": "2016-06-14T15:02:04.585Z",
           "updated_at": "2016-06-14T15:02:04.585Z",
@@ -2947,8 +2900,6 @@
           "id": 221,
           "target_type": "MergeRequest",
           "target_id": 27,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:36.703Z",
           "updated_at": "2016-06-14T15:02:36.703Z",
@@ -2959,8 +2910,6 @@
           "id": 187,
           "target_type": "MergeRequest",
           "target_id": 27,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:36.703Z",
           "updated_at": "2016-06-14T15:02:36.703Z",
@@ -3230,8 +3179,6 @@
           "id": 222,
           "target_type": "MergeRequest",
           "target_id": 26,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:36.496Z",
           "updated_at": "2016-06-14T15:02:36.496Z",
@@ -3242,8 +3189,6 @@
           "id": 186,
           "target_type": "MergeRequest",
           "target_id": 26,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:36.496Z",
           "updated_at": "2016-06-14T15:02:36.496Z",
@@ -3513,8 +3458,6 @@
           "id": 223,
           "target_type": "MergeRequest",
           "target_id": 15,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:25.262Z",
           "updated_at": "2016-06-14T15:02:25.262Z",
@@ -3525,8 +3468,6 @@
           "id": 175,
           "target_type": "MergeRequest",
           "target_id": 15,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:25.262Z",
           "updated_at": "2016-06-14T15:02:25.262Z",
@@ -4202,8 +4143,6 @@
           "id": 224,
           "target_type": "MergeRequest",
           "target_id": 14,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:25.113Z",
           "updated_at": "2016-06-14T15:02:25.113Z",
@@ -4214,8 +4153,6 @@
           "id": 174,
           "target_type": "MergeRequest",
           "target_id": 14,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:25.113Z",
           "updated_at": "2016-06-14T15:02:25.113Z",
@@ -4274,9 +4211,7 @@
             {
               "id": 529,
               "target_type": "Note",
-              "target_id": 2521,
-              "title": "test levels",
-              "data": null,
+              "target_id": 793,
               "project_id": 4,
               "created_at": "2016-07-07T14:35:12.128Z",
               "updated_at": "2016-07-07T14:35:12.128Z",
@@ -4749,8 +4684,6 @@
           "id": 225,
           "target_type": "MergeRequest",
           "target_id": 13,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:24.636Z",
           "updated_at": "2016-06-14T15:02:24.636Z",
@@ -4761,8 +4694,6 @@
           "id": 173,
           "target_type": "MergeRequest",
           "target_id": 13,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:24.636Z",
           "updated_at": "2016-06-14T15:02:24.636Z",
@@ -5247,8 +5178,6 @@
           "id": 226,
           "target_type": "MergeRequest",
           "target_id": 12,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:24.253Z",
           "updated_at": "2016-06-14T15:02:24.253Z",
@@ -5259,8 +5188,6 @@
           "id": 172,
           "target_type": "MergeRequest",
           "target_id": 12,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:24.253Z",
           "updated_at": "2016-06-14T15:02:24.253Z",
@@ -5506,8 +5433,6 @@
           "id": 227,
           "target_type": "MergeRequest",
           "target_id": 11,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:23.865Z",
           "updated_at": "2016-06-14T15:02:23.865Z",
@@ -5518,8 +5443,6 @@
           "id": 171,
           "target_type": "MergeRequest",
           "target_id": 11,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:23.865Z",
           "updated_at": "2016-06-14T15:02:23.865Z",
@@ -6195,8 +6118,6 @@
           "id": 228,
           "target_type": "MergeRequest",
           "target_id": 10,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:23.660Z",
           "updated_at": "2016-06-14T15:02:23.660Z",
@@ -6207,8 +6128,6 @@
           "id": 170,
           "target_type": "MergeRequest",
           "target_id": 10,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:23.660Z",
           "updated_at": "2016-06-14T15:02:23.660Z",
@@ -6478,8 +6397,6 @@
           "id": 229,
           "target_type": "MergeRequest",
           "target_id": 9,
-          "title": null,
-          "data": null,
           "project_id": 36,
           "created_at": "2016-06-14T15:02:22.927Z",
           "updated_at": "2016-06-14T15:02:22.927Z",
@@ -6490,8 +6407,6 @@
           "id": 169,
           "target_type": "MergeRequest",
           "target_id": 9,
-          "title": null,
-          "data": null,
           "project_id": 5,
           "created_at": "2016-06-14T15:02:22.927Z",
           "updated_at": "2016-06-14T15:02:22.927Z",

spec/lib/gitlab/import_export/project_tree_restorer_spec.rb

@@ -57,10 +57,6 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
         expect(Ci::Pipeline.where(ref: nil)).not_to be_empty
       end
 
-      it 'restores the correct event with symbolised data' do
-        expect(Event.where.not(data: nil).first.data[:ref]).not_to be_empty
-      end
-
       it 'preserves updated_at on issues' do
         issue = Issue.where(description: 'Aliquam enim illo et possimus.').first
 
@@ -80,7 +76,7 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
       end
 
       context 'event at forth level of the tree' do
-        let(:event) { Event.where(title: 'test levels').first }
+        let(:event) { Event.where(action: 6).first }
 
         it 'restores the event' do
           expect(event).not_to be_nil

spec/lib/gitlab/import_export/safe_model_attributes.yml

@@ -29,8 +29,6 @@ Event:
 - id
 - target_type
 - target_id
-- title
-- data
 - project_id
 - created_at
 - updated_at

spec/models/event_spec.rb

@@ -11,7 +11,6 @@ describe Event do
     it { is_expected.to respond_to(:author_email) }
     it { is_expected.to respond_to(:issue_title) }
     it { is_expected.to respond_to(:merge_request_title) }
-    it { is_expected.to respond_to(:commits) }
   end
 
   describe 'Callbacks' do