source: de.wigbels.ruby/contact/db/migrate/003_change_reference_contact_contactgroup.rb@ e9f5e39

class ChangeReferenceContactContactgroup < ActiveRecord::Migration
  def self.up
    # move the reference between contacts..contactgroups the other way round
    execute "alter table contactgroups drop foreign key fk_contactgroups_contacts"
    remove_column :contactgroups, :contact_id
    
    add_column :contacts, :contactgroup_id, :integer, :null => false
    execute "alter table contacts add constraint fk_contacts_contactgroups foreign key (contactgroup_id) references contactgroups(id)"
  end

  def self.down
  end
end