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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 AddPathIndexToRedirectRoutes < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
INDEX_NAME = 'index_redirect_routes_on_path_unique_text_pattern_ops'
# Indexing on LOWER(path) varchar_pattern_ops speeds up the LIKE query in
# RedirectRoute.matching_path_and_descendants
#
def up
return unless Gitlab::Database.postgresql?
disable_statement_timeout
unless index_exists_by_name?(:redirect_routes, INDEX_NAME)
execute("CREATE UNIQUE INDEX CONCURRENTLY #{INDEX_NAME} ON redirect_routes (lower(path) varchar_pattern_ops);")
end
end
def down
# Do nothing in the DOWN. Since the index above is originally created in the
# `ReworkRedirectRoutesIndexes`. This migration wouldn't have actually
# created any new index.
#
# This migration is only here to be called form `setup_postgresql.rake` so
# any newly created database would have this index.
end
end
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