discourse/db/migrate/20180706054922_drop_key_col...

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class DropKeyColumnFromThemes < ActiveRecord::Migration[5.2]
def up
add_column :user_options, :theme_ids, :integer, array: true, null: false, default: []
execute(
"UPDATE user_options AS uo
SET theme_ids = (
SELECT array_agg(themes.id)
FROM themes
INNER JOIN user_options
ON themes.key = user_options.theme_key
WHERE user_options.user_id = uo.user_id
) WHERE uo.theme_key IN (SELECT key FROM themes)"
)
execute(
"INSERT INTO site_settings (name, data_type, value, created_at, updated_at)
SELECT 'default_theme_id', 3, id, now(), now()
FROM themes
WHERE key = (SELECT value FROM site_settings WHERE name = 'default_theme_key')"
)
execute("DELETE FROM site_settings WHERE name = 'default_theme_key'")
# delayed drop for theme_key on user_options table
# delayed drop for key on themes table
end
def down
raise ActiveRecord::IrreversibleMigration
end
end