validates_uniqueness_of only if present

rubyonrails-talk
1

Hi - I want to allow duplicate fields values if the field is blank, but disallow duplicates if it's not. Is there a validates_uniqueness_of_if_present equivalent?

Thanks, Dino

2

You can use :allow_nil or :allow_blank attributes to it like

validates_uniqueness_of :email, :allow_nil => true

this would skip the validation if field is nil. :allow_blank works same way on empty strings.

And then all/most validations com with the :if and :unless options that would allow for more detailed determination if the validation should be used

3

dino d. wrote:

Hi - I want to allow duplicate fields values if the field is blank, but disallow duplicates if it's not. Is there a validates_uniqueness_of_if_present equivalent?

Thanks, Dino

Hi,    As you required to place duplicate value if field is blank than you just use    validates_uniqueness_of :field_name,:allow_blank => 'true'

   :allow_nil - If set to true, skips this validation if the attribute is nil (default is false).

   :allow_blank - If set to true, skips this validation if the attribute is blank (default is false).