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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 AddIndexOnEventsProjectIdId < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
COLUMNS = %i[project_id id].freeze
TABLES = %i[events events_for_migration].freeze
disable_ddl_transaction!
def up
TABLES.each do |table|
add_concurrent_index(table, COLUMNS) unless index_exists?(table, COLUMNS)
# We remove the index _after_ adding the new one since MySQL doesn't let
# you remove an index when a foreign key exists for the same column.
if index_exists?(table, :project_id)
remove_concurrent_index(table, :project_id)
end
end
end
def down
TABLES.each do |table|
unless index_exists?(table, :project_id)
add_concurrent_index(table, :project_id)
end
unless index_exists?(table, COLUMNS)
remove_concurrent_index(table, COLUMNS)
end
end
end
end
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