discourse/db/migrate/20190325162154_make_site_se...

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class MakeSiteSettingsUnique < ActiveRecord::Migration[5.2]
def up
execute <<~SQL
DELETE
FROM site_settings a USING site_settings b
WHERE a.id < b.id AND a.name = b.name
SQL
add_index :site_settings, [:name], unique: true
end
def down
remove_index :site_settings, [:name]
end
end