change name ActiveRecord can be used in migration to rename required records, here for redmine

change name ActiveRecord

def change(type, old_name, new_name)
  case type
  when :role
    klass = Role
    field = :name
  when :group
    klass = Group
    field = :lastname
  else
    raise "unsupported type:#{type}"
  end
    
  old_o = klass.where(field.to_s => old_name).first
  new_o = klass.where(field.to_s => new_name).first

  assign = field.to_s + '='
  case
  when (new_o and old_o.nil?)
    return :allready
  when (new_o.nil? and old_o)
    old_o.method(assign.to_sym).call(new_name)
    old_o.save
  when (new_o.nil? and old_o.nil?)
    raise "no old record"
  end
end