Add timestamps to an existing table

Question

I need to add timestamps (created_at & updated_at) to an existing table. I tried the following code but it didn\'t work.

class          


        

Answer 1

Nick Davies answer is the most complete in terms of adding timestamp columns to a table with existing data. Its only downside is that it will raise ActiveRecord::IrreversibleMigration on a db:rollback.

It should be modified like so to work in both directions:

def change
  add_timestamps :campaigns, default: DateTime.now
  change_column_default :campaigns, :created_at, from: DateTime.now, to: nil
  change_column_default :campaigns, :updated_at, from: DateTime.now, to: nil
end