lemmy/migrations/2022-12-05-110642_registrat.../up.sql

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-- create enum for registration modes
create type registration_mode_enum as enum
('closed', 'require_application', 'open');
-- use this enum for registration mode setting
alter table local_site add column
registration_mode registration_mode_enum not null default 'require_application';
-- generate registration mode value from previous settings
with subquery as (
select open_registration, require_application,
case
when open_registration=false then 'closed'::registration_mode_enum
when open_registration=true and require_application=true then 'require_application'
else 'open'
end
from local_site
)
update local_site
set registration_mode = subquery.case
from subquery;
-- drop old registration settings
alter table local_site drop column open_registration;
alter table local_site drop column require_application;