Update a column, all rows

Question

I added a new column to my table but I forgot to add the :default option. Now I want to populate that column on every single row.

Is there a way to do with using the con

Answer 1

Since you already created the new field in a previous migration, create a brand new migration:

rails g migration UpdateFoos

Modify the migration:

def self.up    
  say_with_time "Updating foos..." do
    Foo.find(:all).each do |f|
      f.update_attribute :myattribute, 'value'
    end
  end
end

# from command line
Rake db:migrate

Let me know if this works, it might need a few adjustments. See rails docs for more: