Validate non-model field

Question

I\'ve added an extra field to my new form:

<%= select_tag :quantity, options_for_select([\"Select a Value\"].concat((1..10).to_a)) %>
         


        

Answer 1

Found. You may want to add a virtual attribute in the model.

.........

attr_accessor :not_on_db
.........

validates_presence_of     :not_on_db,
validates_length_of       :not_on_db,    :within => 1..5
.........