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.

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Answer 1

The answers before seem right however I faced issues if my table already has entries.

I would get 'ERROR: column created_at contains null values'.

To fix, I used:

def up
  add_column :projects, :created_at, :datetime, default: nil, null: false
  add_column :projects, :updated_at, :datetime, default: nil, null: false
end

I then used the gem migration_data to add the time for current projects on the migration such as:

def data
  Project.update_all created_at: Time.now
end

Then all projects created after this migration will be correctly updated. Make sure the server is restarted too so that Rails ActiveRecord starts tracking the timestamps on the record.