I would like to have a field on a form that does not have an
column in the table.
Yet I would like to perform some validation on the value. I would like
results of the validation to show up
just like the validations that are performed in the model.
This is very similar to the password_confirmation field on a sign up
The password_confirmation is
there on the screen, but probably not in the underlying table. Also, you
have validations associated
with the confirmation field, like “validates_presence_of”.
How is this done?