Either/Or Validation

Rails
1

How would I use validations to ensure I either received a blank value or
a ten digit number?

If I set validates_length_of :field, :in => 0…10 then that would allow
any value in-between. The allow_nil => true option does not seem to
work.

I’ve also tried using this with some combination of
validates_numericality_of but cannot get it to work.

Any help would be greatly appreciated.

Thanks,
Josh

2

There might be a some funky validates_* methods I don’t know of, but
typically I define my own validate method whenever I need to do anything
more than basic validations.

To do this, just add a validate method to your AR class; here’s a
snippet from my site:

def validate
is_taken = Member.find_by_email(self.email)

unless (is_taken.nil? || is_taken.id == self.id)
errors.add_to_base(“The email address #{self.email} has
already been registered on DevLists.”)
end
end

HTH.

On Monday, January 30, 2006, at 10:20 PM, Joshua S. wrote:

Any help would be greatly appreciated.

Thanks,
Josh

–
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Cheers!
–Dave.