20180206200543_reset_events_primary_key_sequence.rb 838 Bytes
Newer Older
1 2 3
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.

4
class ResetEventsPrimaryKeySequence < ActiveRecord::Migration[4.2]
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
  include Gitlab::Database::MigrationHelpers

  # Set this constant to true if this migration requires downtime.
  DOWNTIME = false

  class Event < ActiveRecord::Base
    self.table_name = 'events'
  end

  def up
    if Gitlab::Database.postgresql?
      reset_primary_key_for_postgresql
    else
      reset_primary_key_for_mysql
    end
  end

  def down
    # No-op
  end

  def reset_primary_key_for_postgresql
    reset_pk_sequence!(Event.table_name)
  end

  def reset_primary_key_for_mysql
    amount = Event.pluck('COALESCE(MAX(id), 1)').first

    execute "ALTER TABLE #{Event.table_name} AUTO_INCREMENT = #{amount}"
  end
end