discourse/db/migrate/20130912185218_acting_user_...

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class ActingUserNull < ActiveRecord::Migration[4.2]
def up
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change_column :user_histories, :acting_user_id, :integer, null: true
end
def down
execute "DELETE FROM user_histories WHERE acting_user_id IS NULL"
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change_column :user_histories, :acting_user_id, :integer, null: false
end
end