Question

I’m trying to create a validation that enforce the :phone field to be 9 digit long if the current object has country_code set to ES.

Im trying to do something like this but it doesn’t work.

validates_length_of :phone, :is => 9, :message => "number needs to be at least 9 digits." if self.country_code == "ES"

Answer 1

I think what you are looking for is:

validates_length_of :phone, :is => 9,
:message => "number needs to be at least 9 digits.",
:if => "country_code == 'ES'"

Or

validates_length_of :phone, :is => 9,
:message => "number needs to be at least 9 digits.",
:if => Proc.new { |a| a.country_code == 'ES' }

Take a look at the docs here.