akkoma/priv/repo/migrations/20181218172826_users_and_activities_flake_id.exs

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2019-01-09 15:08:24 +00:00
defmodule Pleroma.Repo.Migrations.UsersAndActivitiesFlakeId do
use Ecto.Migration
# This migrates from int serial IDs to custom Flake:
# 1- create a temporary uuid column
# 2- fill this column with compatibility ids (see below)
# 3- remove pkeys constraints
# 4- update relation pkeys with the new ids
# 5- rename the temporary column to id
# 6- re-create the constraints
def change do
# Old serial int ids are transformed to 128bits with extra padding.
# The application (in `Pleroma.FlakeId`) handles theses IDs properly as integers; to keep compatibility
# with previously issued ids.
#execute "update activities set external_id = CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);"
#execute "update users set external_id = CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);"
# Lock both tables to avoid a running server to meddling with our transaction
execute "LOCK TABLE activities;"
execute "LOCK TABLE users;"
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execute "ALTER TABLE activities DROP CONSTRAINT activities_pkey CASCADE;"
execute "ALTER TABLE users DROP CONSTRAINT users_pkey CASCADE;"
execute "ALTER TABLE activities ALTER COLUMN id DROP default;"
execute "ALTER TABLE users ALTER COLUMN id DROP default;"
execute "ALTER TABLE activities ALTER COLUMN id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);"
execute "ALTER TABLE users ALTER COLUMN id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);"
execute "ALTER TABLE activities ADD PRIMARY KEY (id);"
execute "ALTER TABLE users ADD PRIMARY KEY (id);"
# Fkeys:
# Activities - Referenced by:
# TABLE "notifications" CONSTRAINT "notifications_activity_id_fkey" FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE
# Users - Referenced by:
# TABLE "filters" CONSTRAINT "filters_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
# TABLE "lists" CONSTRAINT "lists_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
# TABLE "notifications" CONSTRAINT "notifications_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
# TABLE "oauth_authorizations" CONSTRAINT "oauth_authorizations_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id)
# TABLE "oauth_tokens" CONSTRAINT "oauth_tokens_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id)
# TABLE "password_reset_tokens" CONSTRAINT "password_reset_tokens_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id)
# TABLE "push_subscriptions" CONSTRAINT "push_subscriptions_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
# TABLE "websub_client_subscriptions" CONSTRAINT "websub_client_subscriptions_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id)
execute "ALTER TABLE notifications ALTER COLUMN activity_id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(activity_id), 32, '0' ) AS uuid);"
execute "ALTER TABLE notifications ADD CONSTRAINT notifications_activity_id_fkey FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE;"
for table <- ~w(notifications filters lists oauth_authorizations oauth_tokens password_reset_tokens push_subscriptions websub_client_subscriptions) do
execute "ALTER TABLE #{table} ALTER COLUMN user_id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(user_id), 32, '0' ) AS uuid);"
execute "ALTER TABLE #{table} ADD CONSTRAINT #{table}_user_id_fkey FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;"
end
end
end