How to set a default value for a datetime column to record creation time in a migration?

Question

Consider the table creation script below:

create_table :foo do |t|
  t.datetime :starts_at, :null => false
end

Is it\'s possible to set

Answer 1

If you need to change an existing DateTime column in Rails 5 (rather than creating a new table as specified in other answers) so that it can take advantage of the default date capability, you can create a migration like this:

class MakeStartsAtDefaultDateForFoo < ActiveRecord::Migration[5.0]
  def change
    change_column :foos, :starts_at, :datetime, default: -> { 'CURRENT_TIMESTAMP' }
  end
end