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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 AddLowerPathIndexToRedirectRoutes < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
INDEX_NAME = 'index_on_redirect_routes_lower_path'
disable_ddl_transaction!
def up
return unless Gitlab::Database.postgresql?
execute "CREATE INDEX CONCURRENTLY #{INDEX_NAME} ON redirect_routes (LOWER(path));"
end
def down
return unless Gitlab::Database.postgresql?
# Why not use remove_concurrent_index_by_name?
#
# `index_exists?` doesn't work on this index. Perhaps this is related to the
# fact that the index doesn't show up in the schema. And apparently it isn't
# trivial to write a query that checks for an index. BUT there is a
# convenient `IF EXISTS` parameter for `DROP INDEX`.
if supports_drop_index_concurrently?
disable_statement_timeout do
execute "DROP INDEX CONCURRENTLY IF EXISTS #{INDEX_NAME};"
end
else
execute "DROP INDEX IF EXISTS #{INDEX_NAME};"
end
end
end
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