How do you make remove_column reversible?

Question

I have a migration that removes a column:

def change
  remove_column :foos, :bar, :boolean
end

When I try to rake db:rollback that

Answer 1

Instead of using change, you use up and down methods to your migration:

def up
  remove_column :foos, :bar
end

def down
  add_column :foos, :bar, :boolean
end