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# 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[4.2]
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
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
# Once swapped we need to reset the primary key of the new "events" table to
# make sure that data created starts with the right value. This isn't
# necessary for events_for_migration since we replicate existing primary key
# values to it.
if Gitlab::Database.postgresql?
reset_primary_key_for_postgresql
else
reset_primary_key_for_mysql
end
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
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