Fix missing namespace for some internal users

changelogs/unreleased/rd-44635-error-500-when-clicking-ghost-user-or-gitlab-support-bot-in-ui.yml

+---
+title: Fix missing namespace for some internal users
+merge_request: 18357
+author:
+type: fixed

db/migrate/20180413022611_create_missing_namespace_for_internal_users.rb

+class CreateMissingNamespaceForInternalUsers < ActiveRecord::Migration
+  DOWNTIME = false
+
+  def up
+    connection.exec_query(users_query.to_sql).rows.each do |id, username|
+      create_namespace(id, username)
+      # When testing locally I've noticed that these internal users are missing
+      # the notification email, for more details visit the below link:
+      # https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18357#note_68327560
+      set_notification_email(id)
+    end
+  end
+
+  def down
+    # no-op
+  end
+
+  private
+
+  def users
+    @users ||= Arel::Table.new(:users)
+  end
+
+  def namespaces
+    @namespaces ||= Arel::Table.new(:namespaces)
+  end
+
+  def users_query
+    condition = users[:ghost].eq(true)
+
+    if column_exists?(:users, :support_bot)
+      condition = condition.or(users[:support_bot].eq(true))
+    end
+
+    users.join(namespaces, Arel::Nodes::OuterJoin)
+      .on(namespaces[:type].eq(nil).and(namespaces[:owner_id].eq(users[:id])))
+      .where(namespaces[:owner_id].eq(nil))
+      .where(condition)
+      .project(users[:id], users[:username])
+  end
+
+  def create_namespace(user_id, username)
+    path = Uniquify.new.string(username) do |str|
+      query = "SELECT id FROM namespaces WHERE parent_id IS NULL AND path='#{str}' LIMIT 1"
+      connection.exec_query(query).present?
+    end
+
+    insert_query = "INSERT INTO namespaces(owner_id, path, name) VALUES(#{user_id}, '#{path}', '#{path}')"
+    namespace_id = connection.insert_sql(insert_query)
+
+    create_route(namespace_id)
+  end
+
+  def create_route(namespace_id)
+    return unless namespace_id
+
+    row = connection.exec_query("SELECT id, path FROM namespaces WHERE id=#{namespace_id}").first
+    id, path = row.values_at('id', 'path')
+
+    execute("INSERT INTO routes(source_id, source_type, path, name) VALUES(#{id}, 'Namespace', '#{path}', '#{path}')")
+  end
+
+  def set_notification_email(user_id)
+    execute "UPDATE users SET notification_email = email WHERE notification_email IS NULL AND id = #{user_id}"
+  end
+end

spec/migrations/create_missing_namespace_for_internal_users_spec.rb

+require 'spec_helper'
+require Rails.root.join('db', 'migrate', '20180413022611_create_missing_namespace_for_internal_users.rb')
+
+describe CreateMissingNamespaceForInternalUsers, :migration do
+  let(:users) { table(:users) }
+  let(:namespaces) { table(:namespaces) }
+  let(:routes) { table(:routes) }
+
+  internal_user_types = [:ghost]
+  internal_user_types << :support_bot if ActiveRecord::Base.connection.column_exists?(:users, :support_bot)
+
+  internal_user_types.each do |attr|
+    context "for #{attr} user" do
+      let(:internal_user) do
+        users.create!(email: 'test@example.com', projects_limit: 100, username: 'test', attr => true)
+      end
+
+      it 'creates the missing namespace' do
+        expect(namespaces.find_by(owner_id: internal_user.id)).to be_nil
+
+        migrate!
+
+        namespace = Namespace.find_by(type: nil, owner_id: internal_user.id)
+        route = namespace.route
+
+        expect(namespace.path).to eq(route.path)
+        expect(namespace.name).to eq(route.name)
+      end
+
+      it 'sets notification email' do
+        users.update(internal_user.id, notification_email: nil)
+
+        expect(users.find(internal_user.id).notification_email).to be_nil
+
+        migrate!
+
+        user = users.find(internal_user.id)
+        expect(user.notification_email).to eq(user.email)
+      end
+    end
+  end
+end